The three-fingered protein domain of the human genome.
Extracellular domains of some cellular receptors expressed in the organisms at different levels of development belong to three-fingered protein (TFP) fold. The Homo sapiens genome encodes at least 45 genes containing from one to three TFP domains (TFPDs), namely diverse paralogues of the Ly6 gene, CD59 and the receptors of activins, bone morphogenetic proteins, Mullerian inhibiting substance and transforming growth factor-beta. C4.4a and urokinase/plasminogen activatory receptor contain two and three TFPD repeats, respectively. These diverse proteins have a low overall sequence similarity with each other and their hydrophobicity levels vary to a considerable degree. It is suggested that sequence differentiation within the TFPD led to distinct groups of proteins whose attributes were optimized to fit both the physicochemical properties specific to their functional microenvironment and selective targeting of their highly diversified extracellular cofactors.
Galat
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SIMOPRO, Bat 152, IBiTec/DSV/CEA, CE-Saclay, Gif-sur-Yvette Cedex, France. galat@dsvidf.cea.fr
D000595:Amino Acid Sequence; D000818:Animals; D002877:Chromosomes, Human / Q000235:genetics; D017124:Conserved Sequence; D003553:Cystine / Q000737:chemistry; D030562:Databases, Protein; D019143:Evolution, Molecular; D015894:Genome, Human; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D007448:Invertebrates / Q000235:genetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000235:genetics*; D011487:Protein Conformation; D017434:Protein Structure, Tertiary / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D013329:Structure-Activity Relationship; D055411:TGF-beta Superfamily Proteins / Q000737:chemistry* / Q000235:genetics; D014714:Vertebrates / Q000235:genetics
D055411:TGF-beta Superfamily Proteins; D003553:Cystine