ubiquitin-like (Ubl) domain found in ubiquitin; Ubiquitin is a protein modifier in eukaryotes that is involved in various cellular processes, including transcriptional regulation, cell cycle control, and DNA repair. Ubiquitination is comprised of a cascade of E1, E2 and E3 enzymes that results in a covalent bond between the C-terminus of ubiquitin and the epsilon-amino group of a substrate lysine. Ubiquitin-like (Ubl) proteins have similar ubiquitin beta-grasp fold and attach to other proteins in a Ubl manner but with biochemically distinct roles. Ubiquitin (Ub)and Ubl proteins conjugate and deconjugate via ligases and peptidases to covalently modify target polypeptides. Ub includes Ubq/RPL40e and Ubq/RPS27a fusions as well as homopolymeric multiubiquitin protein chains.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76
Cdd:cd01803   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76

ubiquitin-like (Ubl) domain found in ubiquitin; Ubiquitin is a protein modifier in eukaryotes that is involved in various cellular processes, including transcriptional regulation, cell cycle control, and DNA repair. Ubiquitination is comprised of a cascade of E1, E2 and E3 enzymes that results in a covalent bond between the C-terminus of ubiquitin and the epsilon-amino group of a substrate lysine. Ubiquitin-like (Ubl) proteins have similar ubiquitin beta-grasp fold and attach to other proteins in a Ubl manner but with biochemically distinct roles. Ubiquitin (Ub)and Ubl proteins conjugate and deconjugate via ligases and peptidases to covalently modify target polypeptides. Ub includes Ubq/RPL40e and Ubq/RPS27a fusions as well as homopolymeric multiubiquitin protein chains.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76
Cdd:cd01803   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76

Ubiquitin homologues; Ubiquitin-mediated proteolysis is involved in the regulated turnover of proteins required for controlling cell cycle progression

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 17136570      1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:smart00213   1 IELTVKTLDGKTITLEVKPSDTVSELKEKIAELTGIPPEQQRLIYKGKVLEDDRTLADYGIQDGSTIHLVLR 72

Ribosomal L40e family; Bovine L40 has been identified as a secondary RNA binding protein. L40 is fused to a ubiquitin protein.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 17136570    79 EPSLRILAQKYNCDKMICRKCYARLHPRATNCRKKKCGHTNNLRPKKK 126
Cdd:pfam01020   1 EPSLRQLAQKYNCDKMICRKCYARLPPRATNCRKKKCGHTNNLRPKKK 48

UV excision repair protein Rad23; All proteins in this family for which functions are known are components of a multiprotein complex used for targeting nucleotide excision repair to specific parts of the genome. In humans, Rad23 complexes with the XPC protein. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17136570     1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEG---IPPDQQRLIFAGKQLEDGRTLSDYNI 61
Cdd:TIGR00601   1 MTLTFKTLQQQKFKIDMEPDETVKELKEKIEAEQGkdaYPVAQQKLIYSGKILSDDKTVKEYKI 64

50S ribosomal protein L40e; Provisional

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|.
gi 17136570   86 AQKYNCDKMICRKCYARLHPRATNCRkkKCGHTnNLRPKKK 126
Cdd:PRK04136   7 AEKRVFNKKICMRCNARNPWRATKCR--KCGYK-NLRPKAK 44

ubiquitin-like (Ubl) domain found in ubiquitin; Ubiquitin is a protein modifier in eukaryotes that is involved in various cellular processes, including transcriptional regulation, cell cycle control, and DNA repair. Ubiquitination is comprised of a cascade of E1, E2 and E3 enzymes that results in a covalent bond between the C-terminus of ubiquitin and the epsilon-amino group of a substrate lysine. Ubiquitin-like (Ubl) proteins have similar ubiquitin beta-grasp fold and attach to other proteins in a Ubl manner but with biochemically distinct roles. Ubiquitin (Ub)and Ubl proteins conjugate and deconjugate via ligases and peptidases to covalently modify target polypeptides. Ub includes Ubq/RPL40e and Ubq/RPS27a fusions as well as homopolymeric multiubiquitin protein chains.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76
Cdd:cd01803   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76

Ubiquitin homologues; Ubiquitin-mediated proteolysis is involved in the regulated turnover of proteins required for controlling cell cycle progression

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 17136570      1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:smart00213   1 IELTVKTLDGKTITLEVKPSDTVSELKEKIAELTGIPPEQQRLIYKGKVLEDDRTLADYGIQDGSTIHLVLR 72

Ubiquitin family; This family contains a number of ubiquitin-like proteins: SUMO (smt3 homolog), Nedd8, Elongin B, Rub1, and Parkin. A number of them are thought to carry a distinctive five-residue motif termed the proteasome-interacting motif (PIM), which may have a biologically significant role in protein delivery to proteasomes and recruitment of proteasomes to transcription sites.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 17136570     3 IFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLR 74
Cdd:pfam00240   1 ITVKTLDGKKITLEVDPTDTVLELKEKIAEKEGVPPEQQRLIYSGKVLEDDQTLGEYGIEDGSTIHLVLRQR 72

ubiquitin-like (Ubl) domain found in ubiquitin and ubiquitin-like Ubl proteins; Ubiquitin-like (Ubl) proteins have a similar ubiquitin (Ub) beta-grasp fold and attach to other proteins in a Ubl manner but with biochemically distinct roles. Ub and Ubl proteins conjugate and deconjugate via ligases and peptidases to covalently modify target polypeptides. Some Ubl domains have adaptor roles in Ub-signaling by mediating protein-protein interaction. Prokaryotic sulfur carrier proteins are Ub-related proteins that can be activated in an ATP-dependent manner. Polyubiquitination signals for a diverse set of cellular events via different isopeptide linkages formed between the C terminus of one ubiquitin (Ub) and the epsilon-amine of K6, K11, K27, K29, K33, K48, or K63 of a second Ub. One of these seven lysine residues (K27, Ub numbering) is conserved in this Ubl_ubiquitin_like family. K27-linked Ub chains are versatile and can be recognized by several downstream receptor proteins. K27 has roles beyond chain linkage, such as in Ubl NEDD8 (which contains many of the same lysines (K6, K11, K27, K33, K48) as Ub) where K27 has a role (other than conjugation) in the mechanism of protein neddylation.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17136570   3 IFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLV 70
Cdd:cd17039   1 ITVKTLDGKTYTVEVDPDDTVADLKEKIEEKTGIPVEQQRLIYNGKELKDDKTLSDYGIKDGSTIHLV 68

ubiquitin; Provisional

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570    1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76
Cdd:PTZ00044   1 MQILIKTLTGKKQSFNFEPDNTVQQVKMALQEKEGIDVKQIRLIYSGKQMSDDLKLSDYKVVPGSTIHMVLQLRGG 76

ubiquitin-like (Ubl) domain found in Arabidopsis thaliana ubiquitin-protein ligase 5 (AtUPL5) and similar proteins; Arabidopsis thaliana AtUPL5, also termed HECT-type E3 ubiquitin transferase UPL5, is an E3 ubiquitin-protein ligase that contains a ubiquitin-like domain (Ubl), a C-type lectin-binding domain, a leucine zipper and a HECT domain. HECT domain containing-ubiquitin-protein ligases have more than one member in different genomes, these proteins have been classified into four sub-families (UPL1/2, UPL3/4, UPL5 and UPL6/7). AtUPL5 fUPL5 regulates leaf senescence in Arabidopsis through degradation of the transcription factor WRKY53.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17136570   2 QIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLV 70
Cdd:cd16107   1 QIFVRTYCGKTIVLHAKASDTVESLHQQIEARTGIPSLEQRLIFGGRQLQHSQSLESCKMENDATLFLV 69

ubiquitin-like (Ubl) domain found in the Rad23 protein family; The Rad23 family includes the yeast nucleotide excision repair (NER) proteins, Rad23p (in Saccharomyces cerevisiae) and Rhp23p (in Schizosaccharomyces pombe), their mammalian orthologs HR23A and HR23B, and putative DNA repair proteins from plants. Rad23 proteins play dual roles in DNA repair as well as in proteosomal degradation. They have affinity for both the proteasome and ubiquitinylated proteins and participate in translocating polyubiquitinated proteins to the proteasome. Rad23 proteins carry an ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, and two ubiquitin-associated (UBA) domains, as well as a xeroderma pigmentosum group C (XPC) protein-binding domain. The Ubl domain is responsible for the binding to proteasome. The UBA domains are important for binding of ubiquitin (Ub) or multi-ubiquitinated substrates, which suggests Rad23 proteins might be involved in certain pathways of Ub metabolism. Both the Ubl domain and the XPC-binding domain are necessary for efficient NER function of Rad23 proteins.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEG-IPPDQQRLIFAGKQLEDGRTLSDYNIQKESTL 67
Cdd:cd01805   1 MKITFKTLQQQTFEIEVEPSDTVLELKEKIEQEQGdFPASGQKLIYSGKVLKDDKTLSEYNIKEKDFV 68

ubiquitin-like (Ubl) domain found in ubiquitin-like protein FUBI and similar proteins; FUBI is a pro-apoptotic regulatory gene FAU encoding ubiquitin-like protein with ribosomal protein S30 as a C-terminal extension. FUBI functions as a tumor suppressor protein that may be involved in the ATP-dependent proteolytic activity of ubiquitin. The N-terminal ubiquitin-like (Ubl) domain of FUBI has the beta-grasp Ubl fold, and it may act as a substitute or an inhibitor of ubiquitin or one of ubiquitin's close relatives UCRP, FAT10, and Nedd8.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570   1 MQIFVKTltGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG 76
Cdd:cd01793   1 MQLFVRA--QSLHTLEVSGNETVADIKAHIAALEGIAVEDQVLLYAGAPLEDDVVLGQCGIPDLATLEVAVRLLGG 74

Beta-grasp ubiquitin-like fold; Ubiquitin is a protein modifier that is involved in various cellular processes including transcriptional regulation, cell cycle control, and DNA repair in eukaryotes. The ubiquitination process comprises a cascade of E1, E2 and E3 enzymes that results in a covalent bond between the C-terminus of ubiquitin and the epsilon-amino group of a substrate lysine. Ubiquitin-like proteins have similar ubiquitin beta-grasp fold and attach to other proteins in a ubiquitin-like manner but with biochemically distinct roles. Ubiquitin and ubiquitin-like proteins conjugate and deconjugate via ligases and peptidases to covalently modify target polypeptides. Some other ubiquitin-like domains have adaptor roles in ubiquitin-signaling by mediating protein-protein interaction. In addition to Ubiquitin-like (Ubl) domain, Ras-associating (RA) domain, F0/F1 sub-domain of FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, TGS (ThrRS, GTPase and SpoT) domain, Ras-binding domain (RBD), Ubiquitin regulatory domain X (UBX), Dublecortin-like domain, and RING finger- and WD40-associated ubiquitin-like (RAWUL) domain have beta-grasp ubiquitin-like folds, and are included in this superfamily.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17136570   3 IFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLV 70
Cdd:cd00196   1 VKVETPSLKKIVVAVPPSTTLRQVLEKVAKRIGLPPDVIRLLFNGQVLDDLMTAKQVGLEPGEELHFV 68

Ubiquitin-2 like Rad60 SUMO-like; The small ubiquitin-related modifier SUMO-1 is a Ub/Ubl family member, and although SUMO-1 shares structural similarity to Ub, SUMO's cellular functions remain distinct insomuch as SUMO modification alters protein function through changes in activity, cellular localization, or by protecting substrates from ubiquitination. Rad60 family members contain functionally enigmatic, integral SUMO-like domains (SLDs). Despite their divergence from SUMO, each Rad60 SLD interacts with a subset of SUMO pathway enzymes: SLD2 specifically binds the SUMO E2 conjugating enzyme (Ubc9)), whereas SLD1 binds the SUMO E1 (Fub2, also called Uba2) activating and E3 (Pli1, also called Siz1 and Siz2) specificity enzymes. Structural analysis of PDB:2uyz reveals a mechanistic basis for the near-synonymous roles of Rad60 and SUMO in survival of genotoxic stress and suggest unprecedented DNA-damage-response functions for SLDs in regulating SUMOylation. The Rad60 branch of this family is also known as RENi (Rad60-Esc2-Nip45), and biologically it should be two distinct families SUMO and RENi (Rad60-Esc2-Nip45).

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 17136570     1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQ-RLIFAGKQLEDGRTLSDYNIQKESTLHLVL 71
Cdd:pfam11976   1 IKIILKGKDGKEVFIKVKPTTTVSKLINAYRKKRGIPPSQQvRLIFDGERLDPNSTVEDLDIEDGDTIDVVI 72

ubiquitin-like (Ubl) domain 1 found in interferon-stimulated gene 15 (ISG15) and similar proteins; ISG15, also termed interferon-induced 15 kDa protein, or interferon-induced 17 kDa protein (IP17), or ubiquitin cross-reactive protein (UCRP), is an antiviral interferon-induced ubiquitin-like protein (Ubl) that upon viral infection, modifies cellular and viral proteins by mechanisms similar to ubiquitination. Although ISG15 has properties similar to those of other Ubl molecules, it is a unique member of the Ubl superfamily, whose expression and conjugation to target proteins are tightly regulated by specific signaling pathways, indicating it may have specialized functions in the immune system. ISG15 contains two tandem Ubl domains with a beta-grasp Ubl fold. This family corresponds to the first Ubl domain.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIF--AGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd01792   1 WDLTVKMLTGNEFQVSVSPSMTVSELKAQITQKIGVPAFQQRLAVqpSGVELQDGVRLASQGLGPSSTVLLVVK 74

ubiquitin-like (Ubl) domain 2 found in 2'-5'-oligoadenylate synthase-like protein (OASL) and similar proteins; OASL, also termed 2'-5'-OAS-related protein (2'-5'-OAS-RP), or 59 kDa 2'-5'-oligoadenylate synthase-like protein, or thyroid receptor-interacting protein 14, or TR-interacting protein 14 (TRIP-14), or p59 OASL (p59OASL), is an interferon (IFN)-induced antiviral protein that plays an important role in the IFNs-mediated antiviral signaling pathway. It inhibits respiratory syncytial virus replication and is targeted by the viral nonstructural protein 1 (NS1). It also displays antiviral activity against encephalomyocarditis virus (EMCV) and hepatitis C virus (HCV) via an alternative antiviral pathway independent of RNase L. Moreover, OASL does not have 2'-5'-OAS activity, but can bind double-stranded RNA (dsRNA) to enhance RIG-I signaling. OASL belongs to the 2'-5' oligoadenylate synthase (OAS) family. While each member of this family has a conserved N-terminal OAS catalytic domain, only OASL has two tandem C-terminal ubiquitin-like (Ubl) repeats, which are required for its antiviral activity. This family corresponds to the second Ubl domain.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17136570   2 QIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVL 71
Cdd:cd16103   3 QIFVKFPDGTSKPYAINPEDTILDLKEKIEEQGGPPVEDQILLFQGQELRDKKSLKYYGIKDGDTLQLSL 72

UV excision repair protein Rad23; All proteins in this family for which functions are known are components of a multiprotein complex used for targeting nucleotide excision repair to specific parts of the genome. In humans, Rad23 complexes with the XPC protein. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17136570     1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEG---IPPDQQRLIFAGKQLEDGRTLSDYNI 61
Cdd:TIGR00601   1 MTLTFKTLQQQKFKIDMEPDETVKELKEKIEAEQGkdaYPVAQQKLIYSGKILSDDKTVKEYKI 64

ubiquitin-like (Ubl) domain found in ubiquitin-like PHD and RING finger domain-containing protein 2 (UHRF2); UHRF2, also termed Np95/ICBP90-like RING finger protein (NIRF), or Np95-likeRING finger protein, or nuclear protein 97, or nuclear zinc finger protein Np97, or RING finger protein 107, or E3 ubiquitin-protein ligase UHRF2, was originally identified as a ubiquitin ligase acting as a small ubiquitin-like modifier (SUMO) E3 ligase that enhances zinc finger protein 131(ZNF131) SUMOylation but does not enhance ZNF131 ubiquitination. It also ubiquitinates PCNP, a PEST-containing nuclear protein. Moreover, UHRF2 functions as a nuclear protein involved in cell-cycle regulation and has been implicated in tumorigenesis. It interacts with cyclins, CDKs, p53, pRB, PCNA, HDAC1, DNMTs, G9a, methylated histone H3 lysine 9, and methylated DNA. It interacts with the cyclin E-CDK2 complex, ubiquitinates cyclins D1 and E1, induces G1 arrest, and is involved in the G1/S transition regulation. Furthermore, UHRF2 is a direct transcriptional target of the transcription factor E2F-1 in the induction of apoptosis. It recruits HDAC1 and binds to methyl-CpG. UHRF2 also participates in the maturation of Hepatitis B virus (HBV) through interacting with HBV core protein and promoting its degradation. UHRF2 contains an N-terminal ubiquitin-like domain (Ubl), a tandem Tudor domain (TTD), a plant homeodomain (PHD) finger, a set- and ring-associated (SRA) domain, and a C-terminal RING finger.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17136570   1 MQIFVKTLTGK-TITLE-VEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd17123   1 MWIQVRTIDGTeTQTIDdLSRLTKIESLREKIQELFNVRPERQRLFYRGKQLEDGHTLFDYNVGLNDIVQLLIR 74

ubiquitin-like (Ubl) domain found in splicing factor 3A 120kDa subunit (SF3a120) and similar proteins; Mammalian splicing factor SF3a consists of three subunits of 60, 66, and 120 kDa and functions early during pre-mRNA splicing by converting the U2 snRNP to its active form. The 120kDa subunit SF3a120, also termed splicing factor 3A subunit 1 (SF3A1), or spliceosome-associated protein 114 (SAP114), is the U2 snRNP-specific protein that is critical for spliceosome assembly and normal splicing events. During splicing, SF3a120, together with the U2 snRNP and other proteins, are recruited to the 3' splicing site to generate the splicing complex A after the recognition of the 3' splicing site. SF3a120 contains two N-terminal SWAP (suppressor-of-white-apricot) domains, referred to collectively as the SURP module, as well as a C-terminal ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, a common structure involved in protein-protein interactions.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570   8 LTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRL-IFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd01800  19 LNGQVLELTLPLTDTISVLKEKIHEELGMPANKQKLqVEGGGFLKDSNSLAFYNLGSGTVLTLSLK 84

ubiquitin-like (Ubl) domain found in eukaryotic protein linking integrin-associated protein (IAP, also known as CD47) with cytoskeleton (PLIC) proteins; The PLIC proteins (or ubiquilins) family contains human homologs of the yeast ubiquitin-like (Ubl) Dsk2 protein, PLIC-1 (also termed ubiquilin-1), PLIC-2 (also termed ubiquilin-2, or Chap1), PLIC-3 (also termed ubiquilin-3) and PLIC-4 (also termed ubiquilin-4, ataxin-1 interacting ubiquitin-like protein, A1Up, connexin43-interacting protein of 75 kDa, or CIP75), and mouse PLIC proteins. They are ubiquitin (Ub)-binding adaptor proteins involved in all protein degradation pathways through delivering ubiquitinated substrates to proteasomes. They also promote autophagy-dependent cell survival during nutrient starvation. PLIC-1 regulates the function of the thrombospondin receptor CD47 and G protein signaling. It plays a role in TLR4-mediated signaling through interacting with the Toll/interleukin-1 receptor (TIR) domain of TLR4. It also inhibits the TLR3-Trif antiviral pathway by reducing the abundance of Trif. Moreover, PLIC-1 binds to gamma-aminobutyric acid receptors (GABAARs) and modulates the Ub-dependent, proteasomal degradation of GABAARs. Furthermore, PLIC-1 acts as a molecular chaperone regulating amyloid precursor protein (APP) biosynthesis, trafficking, and degradation by stimulating K63-linked polyubiquitination of lysine 688 in the APP intracellular domain. In addition, PLIC-1 is involved in the protein aggregation-stress pathway via associating with the Ub-interacting motif (UIM) proteins ataxin 3, HSJ1a, and epidermal growth factor substrate 15 (EPS15). PLIC-2 is a protein that binds the ATPase domain of the HSP70-like Stch protein. It functions as a negative regulator of G protein-coupled receptor (GPCR) endocytosis. It also involved in amyotrophic lateral sclerosis (ALS)-related dementia. PLIC-3 is encoded by UbiquilinN3, a testis-specific gene. It shows high sequence similarity with the Xenopus protein XDRP1, a nuclear phosphoprotein that binds to the N-terminus of cyclin A and inhibits Ca2+-induced degradation of cyclin A, but not cyclin B. PLIC-4 is an ubiquitin-like (Ubl) nuclear protein that interacts with ataxin-1 and further links ataxin-1 with the chaperone and Ub-proteasome pathways. It also binds to the non-ubiquitinated gap junction protein connexin43 (Cx43) and regulates the turnover of Cx43 through the proteasomal pathway. PLIC proteins contain an N-terminal Ubl domain that is responsible for the binding of Ub-interacting motifs (UIMs) expressed by proteasomes and endocytic adaptors, and C-terminal Ub-associated (UBA) domain that interacts with Ub chains present on proteins destined for proteasomal degradation. In addition, mammalian PLIC2 proteins have an extra collagen-like motif region, which is absent in other PLIC proteins and the yeast Dsk2 protein.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17136570   3 IFVKTLTGKTiTLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd01808   5 VTVKTPKEKE-DFEVPEDSSVKEFKEEISKKFKAPVEQLVLIFAGKILKDQDTLSQHGIKDGLTVHLVIK 73

ubiquitin-like (Ubl) domain found in ubiquitin-like PHD and RING finger domain-containing protein 1(UHRF1); UHRF1, also termed inverted CCAAT box-binding protein of 90 kDa, or nuclear protein 95, or nuclear zinc finger protein Np95 (Np95), or RING finger protein 106, or transcription factor ICBP90, or E3 ubiquitin-protein ligase UHRF1, is a unique chromatin effector protein that integrates the recognition of both histone PTMs and DNA methylation. It is essential for cell proliferation and plays a critical role in the development and progression of many human carcinomas, such as laryngeal squamous cell carcinoma, gastric cancer, esophageal squamous cell carcinoma, colorectal cancer, prostate cancer, and breast cancer. UHRF1 can acts as a transcriptional repressor through its binding to histone H3 when it is unmodified at Arg2. Its overexpression in human lung fibroblasts results in downregulation of expression of the tumor suppressor pRB. It also plays a role in transcriptional repression of the cell cycle regulator p21.Moreover, UHRF1-dependent repression of factors can facilitate the G1-S transition. It interacts with Tat-interacting protein of 60 kDa (TIP60) and induces degradation-independent ubiquitination ofTIP60. It is also an N-methylpurine DNA glycosylase (MPG)-interacting protein that binds MPG in a p53status-independent manner in the DNA base excision repair (BER) pathway. In addition, UHRF1 functions as an epigenetic regulator that is important for multiple aspects of epigenetic regulation, including maintenance of DNA methylation patterns and recognition of various histone modifications. UHRF1 contains an N-terminal ubiquitin-like domain (Ubl), a tandem Tudor domain (TTD), a plant homeodomain (PHD) finger, a SET and RING finger associated (SRA) domain, and a C-terminal RING-finger domain. It specifically binds to hemimethylated DNA, double-stranded CpG dinucleotides, and recruits the maintenance methyltransferase DNMT1 to its hemimethylated DNA substrate through its SRA domain. UHRF1-dependent H3K23 ubiquitination has an essential role in maintenance DNA methylation and replication. The tandem Tudor domain directs UHRF1 binding to the heterochromatin mark histone H3K9me3 and the PHD finger targets UHRF1 to unmodified histone H3 in euchromatic regions. The RING-finger domain exhibits both autocatalytic E3 ubiquitin (Ub) ligase activity and activity against histone H3 and DNMT1.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17136570   1 MQIFVKTLTGK-TITLEVEPSDT-IENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd17122   1 MWIQVRTMDGKeTHRIDSLSKLTkVEELRQKIQELFGVEPERQRLFYRGKQMEDGHTLFDYSVGLNDIVQLLVR 74

ubiquitin-like (Ubl) domain found in ubiquitin domain-containing protein 1 (UBTD1); UBTD1 is the mammalian homolog of the mitochondrial Dc-UbP/UBTD2 protein, both of which contain an N-terminal ubiquitin binding domain (UBD) and a C-terminal ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, a common structure involved in protein-protein interactions. UBTD1 stably interacts with the UBE2D family of E2 ubiquitin conjugating enzymes. As a tumor suppressor, UBTD1 plays a pivotal role in in regulating cellular senescence that mediates p53 function. It is also involved in MDM2 ubiquitination and degradation.

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                ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 17136570   5 VKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVL 71
Cdd:cd17120   3 VRLSTGKDVRLSASMSDTIGQLKKQLHAQEGIEPSWQRWFFSGKLLTDKTRLQETKIQKDFVIQVIV 69

ubiquitin-like (Ubl) domain 1 found in Ankyrin repeat and ubiquitin domain-containing 1 (ANKUB1) and similar proteins; ANKUB1 is an uncharacterized protein with two tandem ubiquitin-like (Ubl) domains located at the N-terminal of Ankyrin repeats (ANK). The Ubl domain may have an adaptor role in ubiquitin (Ub)-signaling by mediating protein-protein interaction. Ubl proteins have a beta-grasp Ubl fold and attach to other proteins in a Ubl manner with biochemically distinct roles. The ankyrin repeats have been identified in numerous proteins with diverse functions. The family corresponds to the first Ubl domain.

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                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17136570   1 MQIFVkTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQR-------LIFAGKQLEDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd17050   1 MRIFV-AFEGEREPLDVSPGQTVGDVKEMIRDKFHIDLSDGKqgrkflvLTYAGADLQDSWVLSDIGIPPGSTIRCLLR 78

ubiquitin-like (Ubl) domain 1 found in FAS-associated factor 1 (FAF1) and similar proteins; FAF1, also termed UBX domain-containing protein 12 (UBXD12), or UBX domain-containing protein 3A (UBXN3A), belongs to the UBXD family of proteins that contains the ubiquitin (Ub) regulatory domain X (UBX) with a beta-grasp ubiquitin-like (Ubl) fold, but without the C-terminal double glycine motif. The UBX domain is typically located at the carboxyl terminus of proteins, and participates broadly in the regulation of protein degradation. In addition, FAF1 contains two tandem Ubl domains, which show high structural similarity with the UBX domain. FAF1 functions as a cofactor of p97 (also known as VCP or Cdc48), which is a homohexameric AAA ATPase (ATPase associated with a variety of activities) involved in a variety of functions ranging from cell-cycle regulation to membrane fusion and protein degradation. The FAF1-p97 complex inhibits the proteasomal protein degradation in which p97 acts as a co-chaperone. Moreover, FAF1 is an apoptotic signaling molecule that acts downstream in the Fas signal transduction pathway. It interacts with the cytoplasmic domain of Fas, but not to a Fas mutant that is deficient in signal transduction. FAF1 is widely expressed in adult and embryonic tissues, and in tumor cell lines, and is localized not only in the cytoplasm where it interacts with Fas, but also in the nucleus. FAF1 contains phosphorylation sites for protein kinase CK2 within the nuclear targeting domain. Phosphorylation influences nuclear localization of FAF1 but does not affect its potentiation of Fas-induced apoptosis. Other functions have also been attributed to FAF1. It inhibits nuclear factor-kappaB (NF-kappaB) by interfering with the nuclear translocation of the p65 subunit. Although the precise role of FAF1 in the ubiquitination pathway remains unclear, FAF1 interacts with valosin-containing protein (VCP), which is involved in the ubiquitin-proteosome pathway. The family corresponds to the first Ubl domain.

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                ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 17136570  11 KTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLI-FAGKQLEDGRTLSDYNIQKESTLHLV 70
Cdd:cd17129  11 RTIDVVLPDTETVGDIKQILENELGIPPCKQILKgWKARTVSDSTVLRSLHLPKENSLYLL 71

ubiquitin-like (Ubl) domain found in UV excision repair protein RAD23 homolog B (HR23B); HR23B, also termed xeroderma pigmentosum group C (XPC) repair-complementing complex 58 kDa protein (p58), is tightly complexed with XPC protein to form the XPC-HR23B complex. Although it displays a high affinity for both single- and double-stranded DNA, the XPC-HR23B complex functions as a global genome repair (GGR)-specific repair factor that is specifically involved in global genome but not transcription-coupled nucleotide excision repair (NER). HR23B also interacts specifically with S5a subunit of the human 26S proteasome, and plays an important role in shuttling ubiquitinated cargo proteins to the proteasome. HR23B contains an N-terminal ubiquitin-like (Ubl) domain that binds proteasomes and two C-terminal ubiquitin-associated (UBA) domains that bind ubiquitin or multi-ubiquitinated substrates. In addition, it has a XPC protein-binding domain that might be necessary for its efficient NER function.

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                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEG---IPPDQQRLIFAGKQLEDGRTLSDYNIQKES 65
Cdd:cd16126   1 MQITLKTLQQQTFKIDIDPEETVKALKEKIESEKGkdaFPVAGQKLIYAGKILNDDTALKEYKIDEKN 68

ubiquitin-like (Ubl) domain found in heme-oxidized IRP2 ubiquitin ligase 1 (HOIL-1) and similar proteins; HOIL-1, also termed RBCK1, or HOIL-1L, or RanBP-type and C3HC4-type zinc finger-containing protein 1, HBV-associated factor 4, or Hepatitis B virus X-associated protein 4, or RING finger protein 54 (RNF54), or ubiquitin-conjugating enzyme 7-interacting protein 3, or UbcM4-interacting protein 28 (UIP28), together with E3 ubiquitin-protein ligase RNF31 (also known as HOIP) and SHANK-associated RH domain interacting protein (SHARPIN), forms the E3-ligase complex (also known as linear-ubiquitin-chain assembly complex LUBAC) that regulates NF-kappaB activity and apoptosis through conjugation of linear polyubiquitin chains to NF-kappaB essential modulator (also known as NEMO or IKBKG). HOIL-1 plays a crucial role in TNF-alpha-mediated NF-kappaB activation. It also functions as an ubiquitin-protein ligase E3 that interacts with not only PKCbeta but also PKCzeta. It can recognize heme-oxidized IRP2 (iron regulatory protein2) and is thought to affect the turnover of oxidatively damaged proteins. HOIL-1 contains an N-terminal ubiqutin-like (UBL) domain and an Npl4 zinc-finger (NZF) domain, which regulate the interaction with the LUBAC subunit RNF31 and ubiquitin, respectively. The NZF domain belongs to RanBP2-type zinc finger (zf-RanBP2) domain superfamily. In addition, HOIL-1 has a RBR domain that was previously known as RING-BetweenRING-RING domain or TRIAD [two RING fingers and a DRIL (double RING finger linked)] domain. Based on current understanding of the structural biology of RBR ligases, the nomenclature of RBR has been corrected as RING-BRcat (benign-catalytic)-Rcat (required-for-catalysis) recently. The RBR (RING1-BRcat-Rcat) domain use an auto-inhibitory mechanism to modulate ubiquitination activity, as well as a hybrid mechanism that combines aspects from both RING and HECT E3 ligase function to facilitate the ubiquitination reaction.

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gi 17136570   1 MQIFV--KTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFaGKQL-EDGRTLSDYNIQKEST---LHLV 70
Cdd:cd01799   5 IKVYVedKSSSSGPITLKVRPHTTIASLKRQIFLEYGFPPSVQRWII-GKRLaTDDETLLSYGIKDSGDpafLYLV 79

ubiquitin-like (Ubl) domain found in plant membrane-anchored ubiquitin-fold proteins (MUBs); The plant MUBs belong to a family of ubiquitin-fold proteins that are plasma membrane-anchored by prenylation. They may serve as docking site to facilitate the association of specific E2s to the plasma membrane. MUBs contain a ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold.

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gi 17136570  18 EPSDTIENVKAKI-----QDKEGIP--PDQQRLIFAGKQLEDGRTLSDYN-IQKES-----TLHLVLRLR 74
Cdd:cd01814  20 SSATTVATLKEKViaewpKDKENGPksINDVKLIYAGKVLENGKTLADSRtPGKVPpggviTMHVVVRPP 89

ubiquitin-like (Ubl) domain found in transmembrane and ubiquitin-like domain-containing proteins TMUB1, TMUB2, and similar proteins; TMUB1, also termed dendritic cell-derived ubiquitin-like protein (DULP), or hepatocyte odd protein shuttling protein, or ubiquitin-like protein SB144, or HOPS, is highly expressed in the nervous system. It is involved in the termination of liver regeneration and plays a negative role in interleukin-6-induced hepatocyte proliferation. The overexpression of Tmub1 has been shown to play a role in the inhibition of cell proliferation. TMUB1 has been implicated in the regulation of locomotor activity and wakefulness in mice, perhaps acting through its interaction with CAMLG. It also facilitates the recycling of AMPA receptors into synaptic membrane in cultured primary neurons. TMUB1 contains transmembrane domains and a ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold. TMUB2 is an uncharacterized transmembrane domain and Ubl domain-containing protein that shows high sequence similarity to TMUB1.

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                ....*....|....*....|....*....|....*....|....*....|....*...
gi 17136570  16 EVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQL-EDGRTLSDYNIQKESTLHLVLR 72
Cdd:cd17057  17 YARPEDTVGDFKRRHFPDELAQGKRVRLIYQGQLLrDDSRTLSSYGIQDGSVIHCHIS 74

ubiquitin-like (Ubl) domain found in transcription elongation factor B (Elongin B) and similar proteins; Elongin B, also termed Elongin 18 kDa subunit, or EloB, or RNA polymerase II transcription factor SIII subunit B (SIII p18), is part of an E3 ubiquitin ligase complex called VEC that activates ubiquitination by the E2 ubiquitin-conjugating enzyme Ubc5. VEC is composed of von Hippel-Lindau tumor suppressor protein (pVHL), elongin C, cullin 2, NEDD8, and Rbx1. ElonginB binds elonginC to form the elonginBC complex which is a positive regulator of RNA polymerase II elongation factor Elongin A. The BC complex then binds VHL (von Hippel-Lindau) tumor suppressor protein to form a VCB ternary complex. Elongin B has a ubiquitin-like (Ubl) domain. Ub has a beta-grasp Ubl fold, a common structure involved in protein-protein interactions. Ub is a protein modifier in eukaryotes that is involved in various cellular processes, including transcriptional regulation, cell cycle control, and DNA repair.

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                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570  11 KTITLEVEPSDTIENVKAKIqdkEGI---PPDQQRLIFAGKQLEDGRTLSDYNI-------QKESTLHLVLRLRGG 76
Cdd:cd01788  11 TTIFTDAKESTTVFELKKII---EGIlkrPPEDQRLYKDDQLLDDTKTLGDCGFtsqtaraQAPATLGLAFRADGE 83

ubiquitin-like (Ubl) domain found in ubiquitin-like domain-containing CTD phosphatase 1 (UBLCP1) and similar proteins; UBLCP1 is a 26S proteasome phosphatase that regulates nuclear proteasome activity. It is localized in the nucleus and it contains conserved ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, which directly interacts with the proteasome. Knockdown of UBLCP1 in cells promotes 26S proteasome assembly and selectively enhances nuclear proteasome activity. UBLCP1 may also play a role in the regulation of phosphorylation state of RNA polymerase II C-terminal domain, a key event during mRNA metabolism.

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                ....*....|....*....|....*....|....*....|....*....|....*.
gi 17136570  10 GKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLI---FAGKQLEDGRTLSDYNIQ 62
Cdd:cd01813   9 GKEYPVTVLSSDTVLDLKQRIFELTGVLPKRQKLLglkVKGKPADDDVKLSSLKLK 64

ubiquitin-like (Ubl) domain found in ubiquitin domain-containing protein UBFD1 and similar proteins; UBFD1, also termed ubiquitin-binding protein homolog (UBPH), is a polyubiquitin binding protein containing a conserved ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, a common structure involved in protein-protein interactions. It may play a role as nuclear factor-kappaB (NF-kappaB) regulator.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|
gi 17136570  11 KTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGkQLEDGRTLSDYNIQKESTLHLV 70
Cdd:cd17047  10 EKYDVKFPLDSTIAELKEHIETLTGVPPAMQKLMYKG-LLKDDKTLRELKVTKGAKVMVV 68

ubiquitin-like (Ubl) domain found in Arabidopsis thaliana NPL4-like proteins NPL4-1, NPL4-2, and similar proteins; The family includes a group of uncharacterized plant ubiquitin-like (Ubl) domain-containing proteins, including Arabidopsis thaliana NPL4-like protein 1 and NPL4-like protein 2.

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                ....*....|....*....|....*....|....*....|....*....|....*....
gi 17136570  15 LEVEPSDTIENVKAKIQDKEGIPPDQQRL-IFAGKQL---EDGRTLSDYNIQKESTLHL 69
Cdd:cd17055  14 VEVPDDATVGDLKEKIAEQLSVPVSDQTLsLDPGPDLltaKSSATLSQLGLKHGDMVFL 72

ubiquitin-like (Ubl) domain found in BAG family molecular chaperone regulator 1 (BAG1) and similar proteins; BAG1, also termed Bcl-2-associated athanogene 1, or HAP, is a multifunctional protein involved in a variety of cellular functions such as apoptosis, transcription, and proliferative pathways, as well as in cell signaling and differentiation. It delivers chaperone-recognized unfolded substrates to the proteasome for degradation. BAG1 functions as a co-chaperone for Hsp70/Hsc70 to increase Hsp70 foldase activity. It also suppresses apoptosis and enhances neuronal differentiation. As an anti-apoptotic factor, BAG1 interacts with tau and regulates its proteasomal degradation. It also binds to BCR-ABL with a high affinity, and directly routes immature BCR-ABL for proteasomal degradation. It acts as a potential therapeutic target in Parkinson's disease. It also modulates huntingtin toxicity, aggregation, degradation, and subcellular distribution, suggesting a role in Huntington's disease. There are at least four isoforms of Bag1 protein that are formed by alternative initiation of translation within a common mRNA. BAG1 contains an N-terminal ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, and a C-terminal BAG domain.

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                ....*....|....*....|....*....|....*....|....*....|....*....
gi 17136570  13 ITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQL-EDGRTLSDYNIQKESTLHLV 70
Cdd:cd01812  16 LPSQDEDEPTLQDLAEAIEEVTGVPVENQKLIFKGKSLkDPEQPLSALGVKNGSKIMLI 74

ubiquitin-like (Ubl) domain found in Sacsin and similar proteins; Sacsin, also termed DnaJ homolog subfamily C member 29 (DNAJC29), is encoded by SACS gene that is highly expressed in the brain. Mutations in SACS can cause the neurodegenerative disease autosomal recessive spastic ataxia of Charlevoix Saguenay (ARSACS) which is characterized by early-onset spastic ataxia. Sacsin is a modular protein that is localized on the mitochondrial surface and possibaly required for normal mitochondrial network organization. Sacsin knockdown resulted in a reduction in cells expressing plyglutamine-expanded ataxin-1, which correlated with a loss of cells with large nuclear ataxin-1 incusions. At the N-terminus, sacsin contains a ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, which can interact with the proteasome. At the C-terminus, sacsin harbors a protein-protein interaction J-domain followed by an higher eukaryotes and prokaryotes nucleotide-binding (HEPN) domain. The J-domain is typically associated with DnaJ-like co-chaperones involved in regulation of the Hsp70 heat shock system.

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                ....*....|....*....|....*....|....*....|
gi 17136570  14 TLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDG 53
Cdd:cd17049  16 TFEVPPSAAVRDIKELIYEETDFPVSEQQLWHNGKELSDW 55

Domain of unknown function (DUF4139); This family is usually found at the C-terminus of proteins.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17136570     3 IFVKTLTGKTITLEVEPSDTIENVKAKIQDKEG--IPPDQQRlIFAGKQLEDGRTLSDYNIQKESTLHL 69
Cdd:pfam13598 145 IASETLPAELEYLAVPKLDPAAFLTAKVTNPSGypLLPGKAN-IFRDGAFVGKGRLDLVAPGEEFTLSF 212

ubiquitin-like (Ubl) domain found in ubiquitin-like protein 7 (UBL7) and similar proteins; UBL7, also termed bone marrow stromal cell ubiquitin-like (Ubl)protein (BMSC-UbP), or ubiquitin-like protein SB132, is a novel Ubl protein that may play roles in regulation of bone marrow stromal cell (BMSC) function or cell differentiation via an evocator-associated and cell-specific pattern. UBL7 contains an N-terminal Ubl domain with a beta-grasp Ubl fold, and a C-terminal ubiquitin-associated (UBA) domain. The Ubl domain interacts with 26S proteasome-dependent degradation, and the UBA domain links cellular processes and the ubiquitin system.

                        10        20        30
                ....*....|....*....|....*....|....*
gi 17136570  38 PDQQRLIFAGKQLEDGRTLSDYNIQKESTLHlVLR 72
Cdd:cd01815  52 PELIDLIYCGRKLKDDQTLDFYGIQSGSTIH-VLR 85

ubiquitin-like (Ubl) domain found in ubiquitin-like protein 5 (UBL5) and similar proteins; UBL5, known as Hub1 in yeast, is an atypical ubiquitin-like (Ubl) post-translational modifier that contains a conserved Ubl domain with a beta-grasp Ubl fold. At the C-terminal end of its Ubl fold is a di-tyrosine motif followed by a single variable residue instead of the characteristic di-glycine found in all other Ubl modifiers, and thus UBL5 does not form covalent conjugates with cellular proteins. The yeast Hub1p binds non-covalently to the HIND element of spliceosomal protein Snu66p (Snu66p is termed SART1 in mammals) and modifies the spliceosome by this unconventional Ubl modifier. In higher eukaryotes, UBL5/Hub1 plays a role in modulating pre-mRNA splicing. It also is required for signaling in the mitochondrial unfolded protein response, through interaction with the transcription factor DVE-1 and upregulation of chaperone genes in response to mitochondrial stress. Moreover, UBL5 functions as a factor that directly binds to and stabilizes FANCI, and promotes the functionality of the Fanconi anemia (FA) DNA repair pathway.

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                ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17136570   1 MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHL 69
Cdd:cd01791   2 IEVICNDRLGKKVRVKCNPDDTIGDLKKLIAAQTGTRPEKIVLKKWYTIFKDHITLEDYEIHDGMNLEL 70