first type I K homology (KH) RNA-binding domain found in the family of poly(C)-binding proteins (PCBPs); The PCBP family, also known as hnRNP E family, comprises four members, PCBP1-4, which are RNA-binding proteins that interact in a sequence-specific manner with single-stranded poly(C) sequences. They are mainly involved in various posttranscriptional regulations, including mRNA stabilization or translational activation/silencing. Besides, PCBPs may share iron chaperone activity. PCBPs contain three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 17737727  26 IRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDGSCPERIVTVSGTTNAIFSAFTLITKKFEEW 92
Cdd:cd22438   1 IRMLMQGKEVGSIIGKKGETIKKFREESGARINISDGSCPERIVTVTGTTDAVFKAFELICRKLEED 67

first type I K homology (KH) RNA-binding domain found in the family of poly(C)-binding proteins (PCBPs); The PCBP family, also known as hnRNP E family, comprises four members, PCBP1-4, which are RNA-binding proteins that interact in a sequence-specific manner with single-stranded poly(C) sequences. They are mainly involved in various posttranscriptional regulations, including mRNA stabilization or translational activation/silencing. Besides, PCBPs may share iron chaperone activity. PCBPs contain three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 17737727  26 IRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDGSCPERIVTVSGTTNAIFSAFTLITKKFEEW 92
Cdd:cd22438   1 IRMLMQGKEVGSIIGKKGETIKKFREESGARINISDGSCPERIVTVTGTTDAVFKAFELICRKLEED 67

KH domain; KH motifs bind RNA in vitro. Autoantibodies to Nova, a KH domain protein, cause paraneoplastic opsoclonus ataxia.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17737727   292 HEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRIsncEEREGGNTDRTITISGNPDSVALAQYLIN 357
Cdd:pfam00013   2 VEILVPSSLVGLIIGKGGSNIKEIREETGAKIQI---PPSESEGNERIVTITGTPEAVEAAKALIE 64

K homology RNA-binding domain;

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17737727    291 QHEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNceereGGNTDRTITISGNPDSVALAQYLINMRI 360
Cdd:smart00322   4 TIEVLIPADKVGLIIGKGGSTIKKIEEETGVKIDIPG-----PGSEERVVEITGPPENVEKAAELILEIL 68

KH domain; KH motifs bind RNA in vitro. Autoantibodies to Nova, a KH domain protein, cause paraneoplastic opsoclonus ataxia.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 17737727    25 TIRLIMQGKEVGSIIGKKGEIVNRFREESGAKINI--SDGSCPERIVTVSGTTNAIFSAFTLITK 87
Cdd:pfam00013   1 TVEILVPSSLVGLIIGKGGSNIKEIREETGAKIQIppSESEGNERIVTITGTPEAVEAAKALIEE 65

first type I K homology (KH) RNA-binding domain found in the family of poly(C)-binding proteins (PCBPs); The PCBP family, also known as hnRNP E family, comprises four members, PCBP1-4, which are RNA-binding proteins that interact in a sequence-specific manner with single-stranded poly(C) sequences. They are mainly involved in various posttranscriptional regulations, including mRNA stabilization or translational activation/silencing. Besides, PCBPs may share iron chaperone activity. PCBPs contain three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 17737727  26 IRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDGSCPERIVTVSGTTNAIFSAFTLITKKFEEW 92
Cdd:cd22438   1 IRMLMQGKEVGSIIGKKGETIKKFREESGARINISDGSCPERIVTVTGTTDAVFKAFELICRKLEED 67

third type I K homology (KH) RNA-binding domain found in the family of poly(C)-binding proteins (PCBPs); The PCBP family, also known as hnRNP E family, comprises four members, PCBP1-4, which are RNA-binding proteins that interact in a sequence-specific manner with single-stranded poly(C) sequences. They are mainly involved in various posttranscriptional regulations, including mRNA stabilization or translational activation/silencing. Besides, PCBPs may share iron chaperone activity. PCBPs contain three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|.
gi 17737727 289 QQQHEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEregGNTDRTITISGNPDSVALAQYLINMR 359
Cdd:cd22439   1 QTTQEITIPNDLIGCIIGKGGTKINEIRQLSGATIKIANSED---GSTERSVTITGTPEAVSLAQYLINAR 68

first type I K homology (KH) RNA-binding domain found in poly(rC)-binding protein 4 (PCBP4) and similar proteins; PCBP4, also called alpha-CP4, or heterogeneous nuclear ribonucleoprotein E4, or hnRNP E4, is a single-stranded nucleic acid binding protein that binds preferentially to oligo dC. It regulates both basal and stress-induced p21 expression through binding p21 3'-UTR and modulating p21 mRNA stability. It also plays a role in the cell cycle and is implicated in lung tumor suppression. PCBP4 contains three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17737727  23 TLTIRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDGSCPERIVTVSGTTNAIFSAFTLITKKFEE 91
Cdd:cd22517   1 TLTLRLLMHGKEVGSIIGKKGETVKRIREESSARITISEGSCPERITTITGSTDAVFRAFSMIAFKLEE 69

second type I K homology (KH) RNA-binding domain found in poly(rC)-binding protein 4 (PCBP4) and similar proteins; PCBP4, also called alpha-CP4, or heterogeneous nuclear ribonucleoprotein E4, or hnRNP E4, is a single-stranded nucleic acid binding protein that binds preferentially to oligo dC. It regulates both basal and stress-induced p21 expression through binding p21 3'-UTR and modulating p21 mRNA stability. It also plays a role in the cell cycle and is implicated in lung tumor suppression. PCBP4 contains three K-homology (KH) RNA-binding domains. The model corresponds to the second one.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|.
gi 17737727 107 IPIRLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQVASEMLPNSTERAVTLSGSAEQITQCIYQICLVMLE 177
Cdd:cd22520   2 VTLRLVIPASQCGSLIGKAGSKIKEIRESTGAQVQVAGDLLPNSTERAVTVSGVPDAIIQCVRQICAVILE 72

third type I K homology (KH) RNA-binding domain found in poly(rC)-binding protein 1 (PCBP1) and similar proteins; The family includes PCBP1 (also called alpha-CP1, or heterogeneous nuclear ribonucleoprotein E1, or hnRNP E1, or nucleic acid-binding protein SUB2.3) and PCBP2 (also called alpha-CP2, or heterogeneous nuclear ribonucleoprotein E2, or hnRNP E2). They are single-stranded nucleic acid binding proteins that bind preferentially to oligo dC. They act as iron chaperones for ferritin. In case of infection by poliovirus, PCBP1 plays a role in initiation of viral RNA replication in concert with the viral protein 3CD. PCBP2 is a major cellular poly(rC)-binding protein. It also binds poly(rU). PCBP2 negatively regulates cellular antiviral responses mediated by MAVS signaling. It acts as an adapter between MAVS and the E3 ubiquitin ligase ITCH, therefore triggering MAVS ubiquitination and degradation. PCBP2 forms a metabolon with the heme oxygenase 1/cytochrome P450 reductase complex for heme catabolism and iron transfer. Both PCBP1 and PCBP2 contain three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17737727 287 AQQQQHEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEregGNTDRTITISGNPDSVALAQYLINMRISMET 364
Cdd:cd22521   2 AQTTSHELTIPNDLIGCIIGRQGAKINEIRQMSGAQIKIANPVE---GSTDRQVTITGSAASISLAQYLINARLSSEK 76

third type I K homology (KH) RNA-binding domain found in poly(rC)-binding protein 4 (PCBP4) and similar proteins; PCBP4, also called alpha-CP4, or heterogeneous nuclear ribonucleoprotein E4, or hnRNP E4, is a single-stranded nucleic acid binding protein that binds preferentially to oligo dC. It regulates both basal and stress-induced p21 expression through binding p21 3'-UTR and modulating p21 mRNA stability. It also plays a role in the cell cycle and is implicated in lung tumor suppression. PCBP4 contains three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 17737727 292 HEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEregGNTDRTITISGNPDSVALAQYLI 356
Cdd:cd22523   4 QEFLIPNDLIGCVIGRQGSKISEIRQMSGAHIKIGNQTE---GTSERHVTITGSPVSITLAQYLI 65

third type I K homology (KH) RNA-binding domain found in heterogeneous nuclear ribonucleoprotein K (hnRNP K) and similar proteins; hnRNP K, also called transformation up-regulated nuclear protein (TUNP), is a pre-mRNA binding protein that binds tenaciously to poly(C) sequences. It may be involved in the nuclear metabolism of hnRNAs, particularly for pre-mRNAs that contain cytidine-rich sequences. It can also bind poly(C) single-stranded DNA. hnRNP K plays an important role in p53/TP53 response to DNA damage, acting at the level of both transcription activation and repression. hnRNP K contains three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRIsncEEREGGNTDRTITISGNPDSVALAQYLINMRIS 361
Cdd:cd22434   5 QVTIPKDLAGSIIGKGGQRIRQIRHESGASIKI---DEPLPGSEDRIITITGTQDQIQNAQYLLQNSVK 70

KH domain; KH motifs bind RNA in vitro. Autoantibodies to Nova, a KH domain protein, cause paraneoplastic opsoclonus ataxia.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17737727   292 HEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRIsncEEREGGNTDRTITISGNPDSVALAQYLIN 357
Cdd:pfam00013   2 VEILVPSSLVGLIIGKGGSNIKEIREETGAKIQI---PPSESEGNERIVTITGTPEAVEAAKALIE 64

third type I K homology (KH) RNA-binding domain found in the family of neuro-oncological ventral antigen (Nova); The family includes two related neuronal RNA-binding proteins, Nova-1 and Nova-2. Nova-1, also called onconeural ventral antigen 1, or paraneoplastic Ri antigen, or ventral neuron-specific protein 1, may regulate RNA splicing or metabolism in a specific subset of developing neurons. It interacts with RNA containing repeats of the YCAY sequence. It is a brain-enriched splicing factor regulating neuronal alternative splicing. Nova-1 is involved in neurological disorders and carcinogenesis. Nova-2, also called astrocytic NOVA1-like RNA-binding protein, is a neuronal RNA-binding protein expressed in a broader central nervous system (CNS) distribution than Nova-1. It functions in neuronal RNA metabolism. NOVA family proteins contain three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEREGGNTDRTITISGNPDSVALAQYLINMRI 360
Cdd:cd09031   4 ELEVPENLVGAILGKGGKTLVEIQELTGARIQISKKGEFVPGTRNRKVTITGTPAAVQAAQYLIEQRI 71

type I K homology (KH) RNA-binding domain found in Mask family proteins; The Mask family includes Drosophila melanogaster ankyrin repeat and KH domain-containing protein Mask, and its mammalian homologues Mask1/ANKHD1 and Mask2/ANKRD17. Mask, also called multiple ankyrin repeat single KH domain-containing protein, is a large ankyrin repeat and KH domain-containing protein involved in Drosophila receptor tyrosine kinase signaling. It acts as a mediator of receptor tyrosine kinase (RTK) signaling and may act either downstream of MAPK or transduce signaling through a parallel branch of the RTK pathway. Mask is required for the development and organization of indirect flight muscle sarcomeres by regulating the formation of M line and H zone and the correct assembly of thick and thin filaments in the sarcomere. Mask1/ANKHD1, also called HIV-1 Vpr-binding ankyrin repeat protein, or multiple ankyrin repeats single KH domain, or Hmask, is highly expressed in various cancer tissues and is involved in cancer progression, including proliferation and invasion. Mask2/ANKRD17, also called ankyrin repeat protein 17, or gene trap ankyrin repeat protein (GTAR), or serologically defined breast cancer antigen NY-BR-16, is a ubiquitously expressed ankyrin factor essential for the vascular integrity during embryogenesis. It may be directly involved in the DNA replication process and play pivotal roles in cell cycle and DNA regulation. It is also involved in innate immune defense against bacteria and viruses.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 17737727 290 QQHEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRIsncEEREGGNTDRTITISGNPDSVALAQYLINMRISM 362
Cdd:cd22404   1 KSKKVTVPNSAISRVIGRGGCNINAIREVSGAHIEI---DKQKGEQGDRRITIKGSADATRQAAQLINALIKD 70

first type I K homology (KH) RNA-binding domain found in Schizosaccharomyces pombe RNA-binding protein Rnc1 and similar proteins; Rnc1, also called RNA-binding protein that suppresses calcineurin deletion 1, is an RNA-binding protein that acts as an important regulator of the posttranscriptional expression of the MAPK phosphatase Pmp1 in fission yeast. It binds and stabilizes pmp1 mRNA and hence acts as a negative regulator of pmk1 signaling. Overexpression of Rnc1 suppresses the Cl(-) sensitivity of calcineurin deletion. The nuclear export of Rnc1 requires mRNA-binding ability and the mRNA export factor Rae1. Rnc1 contains three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17737727  24 LTIRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDG--SCPERIVTVSGTTNAIFSAFTLITKKFEE 91
Cdd:cd22455   1 LTLRALVSSKEAAVIIGKGGENIARLRATTGVKAGVSKVvpGVHDRVLTVSGPLEGVAKAFGLIARTLNE 70

second type I K homology (KH) RNA-binding domain found in Arabidopsis thaliana RNA-binding KH domain-containing protein PEPPER and similar proteins; The family includes a group of plant RNA-binding KH domain-containing proteins, such as PEPPER, flowering locus K homology domain protein (FLK), RNA-binding KH domain-containing protein RCF3 and KH domain-containing protein HEN4. PEPPER regulates vegetative and gynoecium development. It acts as a positive regulator of the central floral repressor FLOWERING LOCUS C. In concert with HUA2, PEPPER antagonizes FLK by positively regulating FLC probably at transcriptional and post-transcriptional levels, and thus acts as a negative regulator of flowering. FLK, also called flowering locus KH domain protein, regulates positively flowering by repressing FLC expression and post-transcriptional modification. PEPPER and FLK contain three K-homology (KH) RNA-binding domains. RCF3, also called protein ENHANCED STRESS RESPONSE 1 (ESR1), or protein HIGH OSMOTIC STRESS GENE EXPRESSION 5 (HOS5), or protein REGULATOR OF CBF GENE EXPRESSION 3, or protein SHINY 1 (SHI1), acts as negative regulator of osmotic stress-induced gene expression. It is involved in the regulation of thermotolerance responses under heat stress. It functions as an upstream regulator of heat stress transcription factor (HSF) genes. HEN4, also called protein HUA ENHANCER 4, plays a role in floral reproductive organ identity in the third whorl and floral determinacy specification by specifically promoting the processing of AGAMOUS (AG) pre-mRNA. It functions in association with HUA1 and HUA2. RCF3 and HEN4 contain five KH RNA-binding domains. The model corresponds to the KH2 domain of PEPPER and FLK, as well as KH2 and KH4 domains of RCF3 and HEN4.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 17737727 110 RLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQV-ASEMLP---NSTERAVTLSGSAEQITQCIYQIC 172
Cdd:cd22460   3 RLLVASSQAGSLIGKGGAIIKQIREESGASVRIlPEEELPpcaSPDDRVVQISGEAQAVKKALELVS 69

first type I K homology (KH) RNA-binding domain found in Arabidopsis thaliana RNA-binding KH domain-containing protein PEPPER and similar proteins; The family includes a group of plant RNA-binding KH domain-containing proteins, such as PEPPER, flowering locus K homology domain protein (FLK), RNA-binding KH domain-containing protein RCF3 and KH domain-containing protein HEN4. PEPPER regulates vegetative and gynoecium development. It acts as a positive regulator of the central floral repressor FLOWERING LOCUS C. In concert with HUA2, PEPPER antagonizes FLK by positively regulating FLC probably at transcriptional and post-transcriptional levels, and thus acts as a negative regulator of flowering. FLK, also called flowering locus KH domain protein, regulates positively flowering by repressing FLC expression and post-transcriptional modification. PEPPER and FLK contain three K-homology (KH) RNA-binding domains. RCF3, also called protein ENHANCED STRESS RESPONSE 1 (ESR1), or protein HIGH OSMOTIC STRESS GENE EXPRESSION 5 (HOS5), or protein REGULATOR OF CBF GENE EXPRESSION 3, or protein SHINY 1 (SHI1), acts as negative regulator of osmotic stress-induced gene expression. It is involved in the regulation of thermotolerance responses under heat stress. It functions as an upstream regulator of heat stress transcription factor (HSF) genes. HEN4, also called protein HUA ENHANCER 4, plays a role in floral reproductive organ identity in the third whorl and floral determinacy specification by specifically promoting the processing of AGAMOUS (AG) pre-mRNA. It functions in association with HUA1 and HUA2. RCF3 and HEN4 contain five KH RNA-binding domains. The model corresponds to the KH1 domain of PEPPER and FLK, as well as KH1 and KH3 domains of RCF3 and HEN4.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*..
gi 17737727  23 TLTIRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDG--SCPERIVTVSGTTNA 77
Cdd:cd22459   1 EVVFRLLCPVSKAGSVIGKGGEIIKQLRQETGARIKVEDGvpGTEERVITISSSEAP 57

K homology RNA-binding domain;

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17737727    291 QHEMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNceereGGNTDRTITISGNPDSVALAQYLINMRI 360
Cdd:smart00322   4 TIEVLIPADKVGLIIGKGGSTIKKIEEETGVKIDIPG-----PGSEERVVEITGPPENVEKAAELILEIL 68

K homology (KH) RNA-binding domain, type I; KH binds single-stranded RNA or DNA. It is found in a wide variety of proteins including ribosomal proteins, transcription factors and post-transcriptional modifiers of mRNA. There are two different KH domains that belong to different protein folds, but they share a single KH motif. The KH motif is folded into a beta alpha alpha beta unit. In addition to the core, type II KH domains (e.g. ribosomal protein S3) include an N-terminal extension and type I KH domains (e.g. hnRNP K) contain a C-terminal extension. Some KH-I superfamily members contain a divergent KH domain that lacks the RNA-binding GXXG motif. Some others have a mutated GXXG motif which may or may not have nucleic acid binding ability.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 17737727 109 IRLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQVASEMlPNSTERAVTLSGSAEQITQCIYQI 171
Cdd:cd00105   1 EEIEVPSELVGLIIGKGGSTIKEIEEETGARIQIPKEG-EGSGERVVTITGTPEAVEKAKELI 62

first type I K homology (KH) RNA-binding domain found in Arabidopsis thaliana RNA-binding KH domain-containing protein PEPPER and similar proteins; The family includes a group of plant RNA-binding KH domain-containing proteins, such as PEPPER, flowering locus K homology domain protein (FLK), RNA-binding KH domain-containing protein RCF3 and KH domain-containing protein HEN4. PEPPER regulates vegetative and gynoecium development. It acts as a positive regulator of the central floral repressor FLOWERING LOCUS C. In concert with HUA2, PEPPER antagonizes FLK by positively regulating FLC probably at transcriptional and post-transcriptional levels, and thus acts as a negative regulator of flowering. FLK, also called flowering locus KH domain protein, regulates positively flowering by repressing FLC expression and post-transcriptional modification. PEPPER and FLK contain three K-homology (KH) RNA-binding domains. RCF3, also called protein ENHANCED STRESS RESPONSE 1 (ESR1), or protein HIGH OSMOTIC STRESS GENE EXPRESSION 5 (HOS5), or protein REGULATOR OF CBF GENE EXPRESSION 3, or protein SHINY 1 (SHI1), acts as negative regulator of osmotic stress-induced gene expression. It is involved in the regulation of thermotolerance responses under heat stress. It functions as an upstream regulator of heat stress transcription factor (HSF) genes. HEN4, also called protein HUA ENHANCER 4, plays a role in floral reproductive organ identity in the third whorl and floral determinacy specification by specifically promoting the processing of AGAMOUS (AG) pre-mRNA. It functions in association with HUA1 and HUA2. RCF3 and HEN4 contain five KH RNA-binding domains. The model corresponds to the KH1 domain of PEPPER and FLK, as well as KH1 and KH3 domains of RCF3 and HEN4.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....
gi 17737727 109 IRLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQVaSEMLPNSTERAVTLSGSAE 162
Cdd:cd22459   4 FRLLCPVSKAGSVIGKGGEIIKQLRQETGARIKV-EDGVPGTEERVITISSSEA 56

second type I K homology (KH) RNA-binding domain found in the insulin-like growth factor 2 mRNA-binding protein (IGF2BP) family; The IGF2BP family includes three members: IGF2BP1/IMP-1/ CRD-BP/ VICKZ1, IGF2BP2/IMP-2/ VICKZ2, and IGF2BP3/IMP-3/VICKZ3, which are RNA-binding factors that recruit target transcripts to cytoplasmic protein-RNA complexes (mRNPs). They function by binding to the 5' UTR of the insulin-like growth factor 2 (IGF2) mRNA and regulating IGF2 translation. IGF2BP proteins contain four K-homology (KH) RNA-binding domains which are important in RNA binding and are known to be involved in RNA synthesis and metabolism. The model corresponds to the second one.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*....
gi 17737727 298 NDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEREGGNTDRTITISGNPDSVALAQYLI 356
Cdd:cd22401   8 NNLCGRLIGKDGRNIKKIMEDTNTKITISSLQDLTSYNPERTITIKGSLEAMSEAESLI 66

first type I K homology (KH) RNA-binding domain found in the FUBP family RNA/DNA-binding proteins; The far upstream element-binding protein (FUBP) family includes FUBP1-3. FUBP1, also called FBP, or FUSE-binding protein 1, or DNA helicase V, or DH V, binds RNA and single-stranded DNA (ssDNA) and may act both as activator and repressor of transcription. It regulates MYC expression by binding to a single-stranded far-upstream element (FUSE) upstream of the MYC promoter. FUBP2, also called FUSE-binding protein 2, or KH type-splicing regulatory protein (KSRP), or p75, is a single-strand nucleic acid binding protein implicated in a variety of cellular processes, including splicing in the nucleus, mRNA decay, maturation of miRNA, and transcriptional control of proto-oncogenes such as c-myc. It regulates the stability and/or translatability of many mRNA species, encoding immune-relevant proteins, either by binding to AU-rich elements (AREs) of mRNA 3'UTR or by facilitating miRNA biogenesis to target mRNA. FUBP3, also called FUSE-binding protein 3, or MARTA2, was previously shown to mediate dendritic targeting of MAP2 mRNA in neurons. It may interact with single-stranded DNA from the far-upstream element (FUSE) and activate gene expression. It is required for beta-actin mRNA localization. It also interacts with fibroblast growth factor 9 (FGF9) 3'-UTR UG repeats and positively controls FGF9 expression through increasing translation of FGF9 mRNA. FUBP proteins contain four K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNceeREGGNTDRTITISGNPDSVALAQYLIN 357
Cdd:cd22396   4 EYKVPDKMVGLIIGRGGEQINRLQAESGAKIQIAP---DSGGLPERPCTLTGTPDAIETAKRLID 65

first type I K homology (KH) RNA-binding domain found in heterogeneous nuclear ribonucleoprotein K (hnRNP K) and similar proteins; hnRNP K, also called transformation up-regulated nuclear protein (TUNP), is a pre-mRNA binding protein that binds tenaciously to poly(C) sequences. It may be involved in the nuclear metabolism of hnRNAs, particularly for pre-mRNAs that contain cytidine-rich sequences. It can also bind poly(C) single-stranded DNA. hnRNP K plays an important role in p53/TP53 response to DNA damage, acting at the level of both transcription activation and repression. hnRNP K contains three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....
gi 17737727  25 TIRLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDGSCPERIVTVSGTTNAI 78
Cdd:cd22432   3 ELRLLIPSKAAGAIIGKGGENIKRLRTEYNASVSVPDSSGPERILTISADRETV 56

second type I K homology (KH) RNA-binding domain found in Arabidopsis thaliana protein BTR1 and similar proteins; BTR1, also called Binding to ToMV RNA 1, is a negative regulator of tomato mosaic virus (ToMV) multiplication but has no effect on the multiplication of cucumber mosaic virus (CMV). BTR1 contains three K-homology (KH) RNA-binding domains. The model corresponds to the second one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17737727  26 IRLIMQGKEVGSIIGKKGEIVNRFREESGAKINIS-----DGSCPERIVTVSGTTNAIFSAFTLITKK 88
Cdd:cd22437   1 VRLLVPNSSCGLIIGKGGSTIKELREDSNANIKISpkdqlLPGSSERIVTITGSFDQVVKAVALILEK 68

K homology (KH) RNA-binding domain, type I; KH binds single-stranded RNA or DNA. It is found in a wide variety of proteins including ribosomal proteins, transcription factors and post-transcriptional modifiers of mRNA. There are two different KH domains that belong to different protein folds, but they share a single KH motif. The KH motif is folded into a beta alpha alpha beta unit. In addition to the core, type II KH domains (e.g. ribosomal protein S3) include an N-terminal extension and type I KH domains (e.g. hnRNP K) contain a C-terminal extension. Some KH-I superfamily members contain a divergent KH domain that lacks the RNA-binding GXXG motif. Some others have a mutated GXXG motif which may or may not have nucleic acid binding ability.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*
gi 17737727  33 KEVGSIIGKKGEIVNRFREESGAKINISDGS--CPERIVTVSGTTNAIFSAFTLI 85
Cdd:cd00105   8 ELVGLIIGKGGSTIKEIEEETGARIQIPKEGegSGERVVTITGTPEAVEKAKELI 62

type I K homology (KH) RNA-binding domain found in Mask family proteins; The Mask family includes Drosophila melanogaster ankyrin repeat and KH domain-containing protein Mask, and its mammalian homologues Mask1/ANKHD1 and Mask2/ANKRD17. Mask, also called multiple ankyrin repeat single KH domain-containing protein, is a large ankyrin repeat and KH domain-containing protein involved in Drosophila receptor tyrosine kinase signaling. It acts as a mediator of receptor tyrosine kinase (RTK) signaling and may act either downstream of MAPK or transduce signaling through a parallel branch of the RTK pathway. Mask is required for the development and organization of indirect flight muscle sarcomeres by regulating the formation of M line and H zone and the correct assembly of thick and thin filaments in the sarcomere. Mask1/ANKHD1, also called HIV-1 Vpr-binding ankyrin repeat protein, or multiple ankyrin repeats single KH domain, or Hmask, is highly expressed in various cancer tissues and is involved in cancer progression, including proliferation and invasion. Mask2/ANKRD17, also called ankyrin repeat protein 17, or gene trap ankyrin repeat protein (GTAR), or serologically defined breast cancer antigen NY-BR-16, is a ubiquitously expressed ankyrin factor essential for the vascular integrity during embryogenesis. It may be directly involved in the DNA replication process and play pivotal roles in cell cycle and DNA regulation. It is also involved in innate immune defense against bacteria and viruses.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 17737727 110 RLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQVASEMlPNSTERAVTLSGSAEQITQCIYQI 171
Cdd:cd22404   4 KVTVPNSAISRVIGRGGCNINAIREVSGAHIEIDKQK-GEQGDRRITIKGSADATRQAAQLI 64

second type I K homology (KH) RNA-binding domain found in Arabidopsis thaliana RNA-binding KH domain-containing protein PEPPER and similar proteins; The family includes a group of plant RNA-binding KH domain-containing proteins, such as PEPPER, flowering locus K homology domain protein (FLK), RNA-binding KH domain-containing protein RCF3 and KH domain-containing protein HEN4. PEPPER regulates vegetative and gynoecium development. It acts as a positive regulator of the central floral repressor FLOWERING LOCUS C. In concert with HUA2, PEPPER antagonizes FLK by positively regulating FLC probably at transcriptional and post-transcriptional levels, and thus acts as a negative regulator of flowering. FLK, also called flowering locus KH domain protein, regulates positively flowering by repressing FLC expression and post-transcriptional modification. PEPPER and FLK contain three K-homology (KH) RNA-binding domains. RCF3, also called protein ENHANCED STRESS RESPONSE 1 (ESR1), or protein HIGH OSMOTIC STRESS GENE EXPRESSION 5 (HOS5), or protein REGULATOR OF CBF GENE EXPRESSION 3, or protein SHINY 1 (SHI1), acts as negative regulator of osmotic stress-induced gene expression. It is involved in the regulation of thermotolerance responses under heat stress. It functions as an upstream regulator of heat stress transcription factor (HSF) genes. HEN4, also called protein HUA ENHANCER 4, plays a role in floral reproductive organ identity in the third whorl and floral determinacy specification by specifically promoting the processing of AGAMOUS (AG) pre-mRNA. It functions in association with HUA1 and HUA2. RCF3 and HEN4 contain five KH RNA-binding domains. The model corresponds to the KH2 domain of PEPPER and FLK, as well as KH2 and KH4 domains of RCF3 and HEN4.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17737727  27 RLIMQGKEVGSIIGKKGEIVNRFREESGAKINISDGSCP-------ERIVTVSGTTNAIFSAFTLITK 87
Cdd:cd22460   3 RLLVASSQAGSLIGKGGAIIKQIREESGASVRILPEEELppcaspdDRVVQISGEAQAVKKALELVSS 70

third type I K homology (KH) RNA-binding domain found in the insulin-like growth factor 2 mRNA-binding protein (IGF2BP) family; The IGF2BP family includes three members: IGF2BP1/IMP-1/ CRD-BP/ VICKZ1, IGF2BP2/IMP-2/ VICKZ2, and IGF2BP3/IMP-3/VICKZ3, which are RNA-binding factors that recruit target transcripts to cytoplasmic protein-RNA complexes (mRNPs). They function by binding to the 5' UTR of the insulin-like growth factor 2 (IGF2) mRNA and regulating IGF2 translation. IGF2BP proteins contain four K-homology (KH) RNA-binding domains which are important in RNA binding and are known to be involved in RNA synthesis and metabolism. The model corresponds to the third one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17737727 110 RLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQVASEMLPNSTERAVTLSGSAEqiTQCIYQICL 173
Cdd:cd22402   4 YLYIPNKAVGAIIGTKGSHIRYIKRFSGASIKIAPADSPDAPERKVTITGPPE--AQWKAQLCI 65

second type I K homology (KH) RNA-binding domain found in the family of neuro-oncological ventral antigen (Nova); The family includes two related neuronal RNA-binding proteins, Nova-1 and Nova-2. Nova-1, also called onconeural ventral antigen 1, or paraneoplastic Ri antigen, or ventral neuron-specific protein 1, may regulate RNA splicing or metabolism in a specific subset of developing neurons. It interacts with RNA containing repeats of the YCAY sequence. It is a brain-enriched splicing factor regulating neuronal alternative splicing. Nova-1 is involved in neurological disorders and carcinogenesis. Nova-2, also called astrocytic NOVA1-like RNA-binding protein, is a neuronal RNA-binding protein expressed in a broader central nervous system (CNS) distribution than Nova-1. It functions in neuronal RNA metabolism. NOVA family proteins contain three K-homology (KH) RNA-binding domains. The model corresponds to the second one.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*...
gi 17737727 108 PIRLIVPASQCGSLIGKSGSKIKEIRQTTGCSIQVASEML-PNSTERAVTLSGSAEQI 164
Cdd:cd22436   2 QVKILVPNSTAGMIIGKGGATIKAIMEQSGARVQISQKPEsINLQERVVTVTGEPEAN 59

third type I K homology (KH) RNA-binding domain found in Schizosaccharomyces pombe RNA-binding protein Rnc1 and similar proteins; Rnc1, also called RNA-binding protein that suppresses calcineurin deletion 1, is an RNA-binding protein that acts as an important regulator of the posttranscriptional expression of the MAPK phosphatase Pmp1 in fission yeast. It binds and stabilizes pmp1 mRNA and hence acts as a negative regulator of pmk1 signaling. Overexpression of Rnc1 suppresses the Cl(-) sensitivity of calcineurin deletion. The nuclear export of Rnc1 requires mRNA-binding ability and the mRNA export factor Rae1. Rnc1 contains three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*..
gi 17737727 113 VPASQCGSLIGKSGSKIKEIRQTTGCSIQVASEMLPNSTERAVTLSGSAEQITQCIY 169
Cdd:cd22457   5 IPPDMVGCIIGKGGSKIQEIRRLSGCKISIAKAPHDETGERMFTITGTPEANDRALR 61

first type I K homology (KH) RNA-binding domain found in tudor and KH domain-containing protein (TDRKH) and similar proteins; TDRKH, also called tudor domain-containing protein 2 (TDRD2), is a mitochondria-anchored RNA-binding protein that is required for spermatogenesis and involved in piRNA biogenesis. It specifically recruits MIWI, but not MILI, to engage the piRNA pathway. TDRKH contains two K-homology (KH) RNA-binding domains and one tudor domain, which are involved in binding to RNA or single-strand DNA. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNcEEREGGNTDRTITISGNPDSVALAQYLIN 357
Cdd:cd22428   8 EMKVPREAVGLIIGRQGATIKQIQKETGARIDFKD-EGSGGELPERVLLIQGNPVQAQRAEEAIH 71

second type I K homology (KH) RNA-binding domain found in Arabidopsis thaliana RNA-binding KH domain-containing protein PEPPER and similar proteins; The family includes a group of plant RNA-binding KH domain-containing proteins, such as PEPPER, flowering locus K homology domain protein (FLK), RNA-binding KH domain-containing protein RCF3 and KH domain-containing protein HEN4. PEPPER regulates vegetative and gynoecium development. It acts as a positive regulator of the central floral repressor FLOWERING LOCUS C. In concert with HUA2, PEPPER antagonizes FLK by positively regulating FLC probably at transcriptional and post-transcriptional levels, and thus acts as a negative regulator of flowering. FLK, also called flowering locus KH domain protein, regulates positively flowering by repressing FLC expression and post-transcriptional modification. PEPPER and FLK contain three K-homology (KH) RNA-binding domains. RCF3, also called protein ENHANCED STRESS RESPONSE 1 (ESR1), or protein HIGH OSMOTIC STRESS GENE EXPRESSION 5 (HOS5), or protein REGULATOR OF CBF GENE EXPRESSION 3, or protein SHINY 1 (SHI1), acts as negative regulator of osmotic stress-induced gene expression. It is involved in the regulation of thermotolerance responses under heat stress. It functions as an upstream regulator of heat stress transcription factor (HSF) genes. HEN4, also called protein HUA ENHANCER 4, plays a role in floral reproductive organ identity in the third whorl and floral determinacy specification by specifically promoting the processing of AGAMOUS (AG) pre-mRNA. It functions in association with HUA1 and HUA2. RCF3 and HEN4 contain five KH RNA-binding domains. The model corresponds to the KH2 domain of PEPPER and FLK, as well as KH2 and KH4 domains of RCF3 and HEN4.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 17737727 301 IGCIIGKGGTKIAEIRQISGAMIRI--SNCEEREGGNTDRTITISGNPDSVALAQYLINMRI 360
Cdd:cd22460  11 AGSLIGKGGAIIKQIREESGASVRIlpEEELPPCASPDDRVVQISGEAQAVKKALELVSSRL 72

third type I K homology (KH) RNA-binding domain found in heterogeneous nuclear ribonucleoprotein K (hnRNP K) and similar proteins; hnRNP K, also called transformation up-regulated nuclear protein (TUNP), is a pre-mRNA binding protein that binds tenaciously to poly(C) sequences. It may be involved in the nuclear metabolism of hnRNAs, particularly for pre-mRNAs that contain cytidine-rich sequences. It can also bind poly(C) single-stranded DNA. hnRNP K plays an important role in p53/TP53 response to DNA damage, acting at the level of both transcription activation and repression. hnRNP K contains three K-homology (KH) RNA-binding domains. The model corresponds to the third one.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|....*....
gi 17737727  36 GSIIGKKGEIVNRFREESGAKINISD---GScPERIVTVSGTTNAIFSA 81
Cdd:cd22434  14 GSIIGKGGQRIRQIRHESGASIKIDEplpGS-EDRIITITGTQDQIQNA 61

second type I K homology (KH) RNA-binding domain found in the family of neuro-oncological ventral antigen (Nova); The family includes two related neuronal RNA-binding proteins, Nova-1 and Nova-2. Nova-1, also called onconeural ventral antigen 1, or paraneoplastic Ri antigen, or ventral neuron-specific protein 1, may regulate RNA splicing or metabolism in a specific subset of developing neurons. It interacts with RNA containing repeats of the YCAY sequence. It is a brain-enriched splicing factor regulating neuronal alternative splicing. Nova-1 is involved in neurological disorders and carcinogenesis. Nova-2, also called astrocytic NOVA1-like RNA-binding protein, is a neuronal RNA-binding protein expressed in a broader central nervous system (CNS) distribution than Nova-1. It functions in neuronal RNA metabolism. NOVA family proteins contain three K-homology (KH) RNA-binding domains. The model corresponds to the second one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 17737727  25 TIRLIMQGKEVGSIIGKKGEIVNRFREESGAKINIS----DGSCPERIVTVSGTTNAIFSAFTLITKK 88
Cdd:cd22436   2 QVKILVPNSTAGMIIGKGGATIKAIMEQSGARVQISqkpeSINLQERVVTVTGEPEANRKAVSLILQK 69

first type I K homology (KH) RNA-binding domain found in the family of neuro-oncological ventral antigen (Nova); The family includes two related neuronal RNA-binding proteins, Nova-1 and Nova-2. Nova-1, also called onconeural ventral antigen 1, or paraneoplastic Ri antigen, or ventral neuron-specific protein 1, may regulate RNA splicing or metabolism in a specific subset of developing neurons. It interacts with RNA containing repeats of the YCAY sequence. It is a brain-enriched splicing factor regulating neuronal alternative splicing. Nova-1 is involved in neurological disorders and carcinogenesis. Nova-2, also called astrocytic NOVA1-like RNA-binding protein, is a neuronal RNA-binding protein expressed in a broader central nervous system (CNS) distribution than Nova-1. It functions in neuronal RNA metabolism. NOVA family proteins contain three K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 17737727 294 MTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEREGGNTDRTITISGNPDSVALAQYLI 356
Cdd:cd22435   6 LLVPNYAAGSIIGKGGQTIAQLQKETGARIKLSKNNDFYPGTTERVCLIQGEVEAVNAVLDFI 68

second type I K homology (KH) RNA-binding domain found in Schizosaccharomyces pombe RNA-binding protein Rnc1 and similar proteins; Rnc1, also called RNA-binding protein that suppresses calcineurin deletion 1, is an RNA-binding protein that acts as an important regulator of the posttranscriptional expression of the MAPK phosphatase Pmp1 in fission yeast. It binds and stabilizes pmp1 mRNA and hence acts as a negative regulator of pmk1 signaling. Overexpression of Rnc1 suppresses the Cl(-) sensitivity of calcineurin deletion. The nuclear export of Rnc1 requires mRNA-binding ability and the mRNA export factor Rae1. Rnc1 contains three K-homology (KH) RNA-binding domains. The model corresponds to the second one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 17737727 296 VSNDLIGCIIGKGGTKIAEIRQISGAMIRISncEEREGGNTDRTITISGNPDSVALAQYLI 356
Cdd:cd22456   6 IPHSLIGSIIGKGGARIKEIQDGSGARLVAS--KEFLPLSTERILEVQGTPDAIHNATLEI 64

first type I K homology (KH) RNA-binding domain found in far upstream element-binding protein 1 (FUBP1) and similar proteins; FUBP1, also called FBP, or FUSE-binding protein 1, or DNA helicase V, or DH V, binds RNA and single-stranded DNA (ssDNA) and may act both as activator and repressor of transcription. It regulates MYC expression by binding to a single-stranded far-upstream element (FUSE) upstream of the MYC promoter. FUBP1 contains four K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISnceEREGGNTDRTITISGNPDSVALAQYLIN 357
Cdd:cd22478   7 EYKVPDGMVGFIIGRGGEQISRIQQESGCKIQIA---PDSGGLPERSCMLTGTPESVQSAKRLLD 68

first type I K homology (KH) RNA-binding domain found in far upstream element-binding protein 2 (FUBP2) and similar proteins; FUBP2, also called FUSE-binding protein 2, or KH type-splicing regulatory protein (KSRP), or p75, is a single-strand nucleic acid binding protein implicated in a variety of cellular processes, including splicing in the nucleus, mRNA decay, maturation of miRNA, and transcriptional control of proto-oncogenes such as c-myc. It regulates the stability and/or translatability of many mRNA species, encoding immune-relevant proteins, either by binding to AU-rich elements (AREs) of mRNA 3'UTR or by facilitating miRNA biogenesis to target mRNA. FUBP2 contains four K-homology (KH) RNA-binding domains. The model corresponds to the first one.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISnceEREGGNTDRTITISGNPDSVALAQYLINMRIS 361
Cdd:cd22479   4 EYRVPDGMVGLIIGRGGEQINKIQQDSGCKVQIS---PDSGGLPERSVSLTGSPEAVQKAKMMLDDIVS 69

type I K homology (KH) RNA-binding domain found in Saccharomyces cerevisiae meiotic recombination 1 protein (MER1) and similar proteins; MER1 is required for chromosome pairing and genetic recombination. It may function to bring the axial elements of the synaptonemal complex corresponding to homologous chromosomes together by initiating recombination. MER1 might be responsible for regulating the MER2 gene and/or gene product.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|
gi 17737727 293 EMTVSNDLIGCIIGKGGTKIAEIRQISGAMIRISNCEEreggNTDRTITISGNPDSVALA 352
Cdd:cd22458   4 EIKLPQALCGRLIGAKGKNIKALSEKSGASIRLIPISN----SSQQTIHLSGTDKQIALA 59