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Title: A non-receptor tyrosine kinase that inhibits the GTPase activity of p21cdc42
Authors: Manser, E. 
Leung, T. 
Salihuddin, H.
Tan, L.
Lim, L.
Issue Date: 27-May-1993
Citation: Manser, E.,Leung, T.,Salihuddin, H.,Tan, L.,Lim, L. (1993-05-27). A non-receptor tyrosine kinase that inhibits the GTPase activity of p21cdc42. Nature 363 (6427) : 364-367. ScholarBank@NUS Repository.
Abstract: The Ras-related Rho subfamily of GTP-binding proteins (p21s), which includes Rho, Rac and Cdc42Hs, is implicated in different aspects of cytoskeletal organization1,2. These proteins behave like Ras (p21ras) in that their active GTP-bound form is inactivated by intrinsic hydrolysis of the nucleotide γ-phosphate, which can be stimulated by GTPase-activating proteins (GAPs). We have previously shown that there is a diversity of GAPs that recognize this subfamily3, including n-chimaerin, which is enriched in the hippocampus4; we also detected proteins that bind these p21 proteins and seem to inhibit GTP hydrolysis. We now report the characterization of a hippocampal complementary DNA encoding a tyrosine kinase that specifically binds Cdc42Hs in its GTP-bound form. This binding is mediated by a unique sequence of 47 amino acids C-terminal to an SH3 domain and inhibits both the intrinsic and GAP-stimulated GTPase activity of Cdc42Hs. Our findings indicate that there may be a regulatory mechanism that sustains the GTP-bound active form of Cdc42Hs and which is directly linked to a tyrosine phosphorylation pathway.
Source Title: Nature
ISSN: 00280836
Appears in Collections:Staff Publications

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