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SPR domain
In molecular biology the SPR domain is a protein domain found in the Sprouty (Spry) and Spred (Sprouty related EVH1 domain) proteins. These have been identified as inhibitors of the Ras/mitogen-activated protein kinase (MAPK) cascade, a pathway crucial for developmental processes initiated by activation of various receptor tyrosine kinases.〔 These proteins share a conserved, C-terminal cysteine-rich region, the SPR domain. This domain has been defined as a novel cytosol to membrane translocation domain. It has been found to be a PtdIns(4,5)P2-binding domain that targets the proteins to a cellular localization that maximizes their inhibitory potential.〔 It also mediates homodimer formation of these proteins.〔〔 The SPR domain can occur in association with the WH1 domain (see ) (located in the N-terminus) in the Spred proteins. == Examples == Human genes encoding protein containing the SPR domain include: * SPRED1, SPRED2, SPRED3, SPRY1, SPRY2, SPRY3, SPRY4
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