ubiquitin-like (Ubl) domain found in Saccharomyces cerevisiae ubiquitin-like protein Smt3p and similar proteins; Smt3 (Suppressor of Mif Two 3) was originally isolated as a high-copy suppressor of a mutation in MIF2, the gene of a centromere binding protein in S. cerevisiae. Smt3p is the yeast homolog of small ubiquitin-related modifier (SUMO) proteins that are involved in post-translational protein modification called SUMOylation, covalently attaching to and detaching from other proteins in cells to modify their function. SUMO resembles ubiquitin (Ub) in its structure, its ability to be ligated to other proteins, as well as in the mechanism of ligation. 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 Ub and the epsilon-amino group of a substrate lysine. Smt3p plays essential roles in cell-cycle regulation and chromosome segregation in budding yeast. It interacts with different modification enzymes, and regulates their functions through linking covalently to its targets.

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gi 67587883  41 QYVTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTGQNEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDAMIS 114
Cdd:cd16116   1 EHINLKVKDQDGNEVFFKIKRTTPLRKLMEAYCKRQGKSMDSVRFLFDGERIREDQTPEDLGMEDGDEIDAMVE 74

ubiquitin-like (Ubl) domain found in Saccharomyces cerevisiae ubiquitin-like protein Smt3p and similar proteins; Smt3 (Suppressor of Mif Two 3) was originally isolated as a high-copy suppressor of a mutation in MIF2, the gene of a centromere binding protein in S. cerevisiae. Smt3p is the yeast homolog of small ubiquitin-related modifier (SUMO) proteins that are involved in post-translational protein modification called SUMOylation, covalently attaching to and detaching from other proteins in cells to modify their function. SUMO resembles ubiquitin (Ub) in its structure, its ability to be ligated to other proteins, as well as in the mechanism of ligation. 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 Ub and the epsilon-amino group of a substrate lysine. Smt3p plays essential roles in cell-cycle regulation and chromosome segregation in budding yeast. It interacts with different modification enzymes, and regulates their functions through linking covalently to its targets.

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gi 67587883  41 QYVTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTGQNEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDAMIS 114
Cdd:cd16116   1 EHINLKVKDQDGNEVFFKIKRTTPLRKLMEAYCKRQGKSMDSVRFLFDGERIREDQTPEDLGMEDGDEIDAMVE 74

Ubiquitin-like protein (sentrin) [Posttranslational modification, protein turnover, chaperones];

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gi 67587883  40 SQYVTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTGQNEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDAMISQVGG 118
Cdd:COG5227  22 TKHINLKVVDQDGTELFFKIKKTTTFKKLMDAFSRRQGKNMSSLRFLFDGKRIDLDQTPGDLDMEDNDEIEAVTEQVGG 100

ubiquitin-like (Ubl) domain found in Saccharomyces cerevisiae ubiquitin-like protein Smt3p and similar proteins; Smt3 (Suppressor of Mif Two 3) was originally isolated as a high-copy suppressor of a mutation in MIF2, the gene of a centromere binding protein in S. cerevisiae. Smt3p is the yeast homolog of small ubiquitin-related modifier (SUMO) proteins that are involved in post-translational protein modification called SUMOylation, covalently attaching to and detaching from other proteins in cells to modify their function. SUMO resembles ubiquitin (Ub) in its structure, its ability to be ligated to other proteins, as well as in the mechanism of ligation. 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 Ub and the epsilon-amino group of a substrate lysine. Smt3p plays essential roles in cell-cycle regulation and chromosome segregation in budding yeast. It interacts with different modification enzymes, and regulates their functions through linking covalently to its targets.

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                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 67587883  41 QYVTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTGQNEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDAMIS 114
Cdd:cd16116   1 EHINLKVKDQDGNEVFFKIKRTTPLRKLMEAYCKRQGKSMDSVRFLFDGERIREDQTPEDLGMEDGDEIDAMVE 74

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).

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gi 67587883    43 VTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTGQ-NEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDAMI 113
Cdd:pfam11976   1 IKIILKGKDGKEVFIKVKPTTTVSKLINAYRKKRGIpPSQQVRLIFDGERLDPNSTVEDLDIEDGDTIDVVI 72

ubiquitin-like (Ubl) domain found in small ubiquitin-related modifier SUMO-2, SUMO-3, SUMO-4, and similar proteins; SUMO (also known as "Smt3" and "sentrin" in other organisms) resembles ubiquitin (Ub) in structure, ligation to other proteins and the mechanism of ligation. 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 Ub and the epsilon-amino group of a substrate lysine. SUMOs, like Ub, are covalently conjugated to lysine residues in a wide variety of target proteins in eukaryotic cells and regulate numerous cellular processes, such as transcription, epigenetic gene control, genomic instability, and protein degradation. The mammalian SUMOs have four paralogs, SUMO1 through SUMO4. SUMO2 and SUMO3 are more closely related to each other than they are to SUMO1. SUMO2/3 are capable of forming chains on substrate proteins through internal lysine residues. The basic biology of SUMO4 remains unclear. A M55V polymorphism in SUMO4 has been associated with susceptibility to type I diabetes in some genetic studies.

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gi 67587883  42 YVTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTGQNEQSIRFLFEGERLRPEMTAEDAGLQEGDLID 110
Cdd:cd16115   1 HINLKVAGQDGSVVQFKIKRHTPLSKLMKAYCDRQGLSMRQIRFRFDGQPINETDTPAQLEMEDEDTID 69

SUMO-like domain 2 (SLD2), structurally similar to a beta-grasp ubiquitin-like fold, found in nuclear factor of activated T-cells 2 interacting protein (NFATC2ip) and similar proteins; NFATC2ip, also termed nuclear factor of activated T cells (NFAT), cytoplasmic, calcineurin dependent 2 interacting protein, or 45 kDa NF-AT-interacting protein, or 45 kDa NFAT-interacting protein (Nip45), or nuclear factor of activated T-cells, or cytoplasmic 2-interacting protein, belongs to the eukaryotic-specific Rad60-Esc2-Nip45 (RENi) protein family. The family members may act as factors in transcriptional regulation, chromatin silencing and genomic stability, and typically contain an N-terminal polar/charged low-complexity segment and two C-terminal consecutive unique small ubiquitin-related modifier (SUMO)-like domains (SLD1 and SLD2) with beta-grasp fold. NFATC2ip was firstly identified as a co-regulator with NFAT and the T helper 2 (Th2)-specific transcription factor, c-Maf, to induce IL-4 production. NFATC2ip has also been involved in cellular differentiation and coordination of the immune response in humans and mice. NFATC2ip SLD2 domain binds to E2 SUMOylation enzyme, Ubc9, in an almost identical manner to that of SUMO and thereby inhibits elongation of poly-SUMO chains.

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gi 67587883  41 QYVTVKVRSPDGEQVL-YRIKKKTRLQKLMNSFCQRTGQNEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDA 111
Cdd:cd17079   1 DEICLRVQGKEKHSQLeVSVSKTAPLKSLMSQYEEAMGLSGRKLSFFFDGTKLSGKETPADLGMESGDVIEV 72

SUMO-like domain 2 (SLD2), structurally similar to a beta-grasp ubiquitin-like fold, found in Saccharomyces cerevisiae establishes silent chromatin protein 2 (Esc2p) and similar proteins; Protein Esc2p belongs to the eukaryotic-specific Rad60-Esc2-Nip45 (RENi) protein family, whose members may act as factors in transcriptional regulation, chromatin silencing and genomic stability, and typically contain an N-terminal polar/charged low-complexity segment and two C-terminal consecutive unique small ubiquitin-related modifier (SUMO)-like domains (SLD1 and SLD2) with beta-grasp fold. Yeast Esc2p was identified as a factor promoting gene silencing. It is also required for genome integrity during DNA replication and sister chromatid cohesion in Saccharomyces cerevisiae. Esc2p promotes Mus81p complex-activity via its SUMO-like and DNA binding domains. It also acts as a novel structure-specific DNA-binding factor implicated in the local regulation of the Srs2p helicase through promoting recombination at sites of stalled replication. In addition, Esc2p specifically promotes the accumulation of SUMOylated Mms21-specific substrates and functions with Mms21p to suppress gross chromosomal rearrangements (GCRs). This family also includes DNA repair protein Rad60p from Schizosaccharomyces pombe. It is a SUMO mimetic and SUMO-targeted ubiquitin ligase (STUbL)-interacting protein that is required for the repair of DNA double strand breaks, recovery from S phase replication arrest, and plays an essential role in cell viability. Like other RENi family members, Rad60p has two SLD domains.

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gi 67587883  43 VTVKVRSPDGEQVLYRIKKKTRLQKLMNSFCQRTG--QNEQSIRFLFEGERLRPEMTAEDAGLQEGDLIDAM 112
Cdd:cd17080   3 IKLKLRGKDNKRLSLKVKPSTTLSDLVEAYKIKKKlsLAAAKVKLEFDGEPLDLSETVEDLDLEDEDMLEVV 74