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J. Biol. Chem., Vol. 277, Issue 31, 28238-28246, August 2, 2002

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Identification of Novel SH3 Domain Ligands for the Src Family Kinase Hck
WISKOTT-ALDRICH SYNDROME PROTEIN (WASP), WASP-INTERACTING PROTEIN (WIP), AND ELMO1^*

Margaret Porter Scott, Francesca Zappacosta^§, Eun Young Kim, Roland S. Annan^§, and W. Todd Miller^¶

From the  Department of Physiology and Biophysics, School of Medicine, State University of New York, Stony Brook, New York 11794-8661 and the ^§ Department of Computational and Structural Sciences, GlaxoSmithKline Pharmaceuticals, King of Prussia, Pennsylvania 19406

The importance of the SH3 domain of Hck in kinase regulation, substrate phosphorylation, and ligand binding has been established. However, few in vivo ligands are known for the SH3 domain of Hck. In this study, we used mass spectrometry to identify ~25 potential binding partners for the SH3 domain of Hck from the monocyte cell line U937. Two major interacting proteins were the actin binding proteins Wiskott-Aldrich syndrome protein (WASP) and WASP-interacting protein (WIP). We also focused on a novel interaction between Hck and ELMO1, an 84-kDa protein that was recently identified as the mammalian ortholog of the Caenorhabditis elegans gene, ced-12. In mammalian cells, ELMO1 interacts with Dock180 as a component of the CrkII/Dock180/Rac pathway responsible for phagocytosis and cell migration. Using purified proteins, we confirmed that WASP-interacting protein and ELMO1 interact directly with the SH3 domain of Hck. We also show that Hck and ELMO1 interact in intact cells and that ELMO1 is heavily tyrosine-phosphorylated in cells that co-express Hck, suggesting that it is a substrate of Hck. The binding of ELMO1 to Hck is specifically dependent on the interaction of a polyproline motif with the SH3 domain of Hck. Our results suggest that these proteins may be novel activators/effectors of Hck.

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