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Identification Of The Abl- And RasGAP-Associated 62 KDa Protein As A Docking Protein, Dok

Y. Yamanashi, D. Baltimore
Published 1997 · Biology, Medicine

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A 62 kDa protein is highly phosphorylated in many cells containing activated tyrosine kinases. This protein, characterized mainly by its avid association with rasGAP, has proved elusive. Anti-phosphotyrosine antibody was used to purify p62. From peptide sequence, molecular cloning revealed a cDNA encoding a novel protein, p62dok, with little homology to others but with a prominent set of tyrosines and nearby sequences suggestive of SH2 binding sites. In cells, v-Abl tyrosine kinase binds and strongly phosphorylates p62dok, which then binds rasGAP. A monoclonal antibody, 2C4, to the rasGAP-associated p62 reacts with p62dok. Thus, p62dok appears to be the long-sought major substrate of many tyrosine kinases.
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