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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
Identification of B cell adaptor for PI3-kinase (BCAP) as an Abl interactor 1-regulated substrate of Abl kinases.
In previous work we showed that Abl interactor 1 (Abi-1), by linking enzyme and substrate, promotes the phosphorylation of Mammalian Enabled (Mena) by c-Abl. To determine whether this mechanism extends to other c-Abl substrates, we used the yeast two-hybrid system to search for proteins that interact with Abi-1. By screening a human leukocytecDNA library, we identified BCAP (B-cell adaptor for phosphoinositide 3-kinase) as another Abi-1-interacting protein. Binding experiments revealed that the SH3 domain of Abi-1 and the C-terminal polyproline structure of BCAP are involved in interactions between the two. In cultured cells, Abi-1 promoted phosphorylation of BCAP not only by c-Abl but also by v-Abl. The phosphorylation sites of BCAP by c-Abl were mapped to five tyrosine residues in the C-terminal region that are well conserved in mammals. These results show that Abi-1 promotes Abl- mediated BCAPphosphorylation and suggest that Abi-1 in general coordinates kinase-substrate interactions.[1]
