SGEF [SEP] found in taxon
SGEF
SGEF (Src homology 3 domain-containing Guanine nucleotide Exchange Factor) is a 97 kDa protein involved in intracellular signalling networks. It functions as a guanine nucleotide exchange factor (GEF) for RhoG, a small G protein of the Rho family.
Discovery.
SGEF was discovered during a screen for androgen-responsive genes in human prostate cancer cells. Subsequent northern blot analysis revealed expression of SGEF in tissues of the heart, brain, placenta, lung, liver, kidney, pancreas, prostate, testis,
mediate recruitment and binding to adaptor proteins suggesting that SGEF is probably involved in the formation of heteromultimeric protein complexes.
Regulation of SGEF activity.
Data from several studies suggest that SGEF is regulated by its recruitment to transmembrane receptor-linked adaptor proteins via its SH3 domain. In one study, mutation of the SH3 domain disrupted SGEF-dependent functions in NIH-3T3 fibroblasts. In endothelial cells SGEF was recruited to the intracellular domain of the transmembrane adhesion molecule ICAM-1 upon leukocyte adhesion to the endothelium.