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Tong, X.K. et al.

The endocytic protein intersectin is a major binding partner for the Ras exchange factor mSos1 in rat brain.

We recently identified intersectin, a protein containing two EH and five SH3 domains, as a component of the endocytic machinery. The N-terminal SH3 domain (SH3A), unlike other SH3 domains from intersectin or various endocytic proteins, specifically inhibits intermediate events leading to the formation of clathrin-coated pits. We have now identified a brain-enriched, 170 kDa protein (p170) that interacts specifically with SH3A. Screening of combinatorial peptides reveals the optimal ligand for SH3A as Pp(V/I)PPR, and the 170 kDa mammalian son-of-sevenless (mSos1) protein, a guanine-nucleotide exchange factor for Ras, con- tains two copies of the matching sequence, PPVPPR. Immunodepletion studies confirm that p170 is mSos1. Intersectin and mSos1 are co-enriched in nerve terminals and are co-immunoprecipitated from brain extracts. SH3A competes with the SH3 domains of Grb2 in binding to mSos1, and the intersectin-mSos1 complex can be separated from Grb2 by sucrose gradient centrifugation. Overexpression of the SH3 domains of intersectin blocks epidermal growth factor-mediated Ras activation. These results suggest that intersectin functions in cell signaling in addition to its role in endocytosis and may link these cellular processes.[1]

References

The endocytic protein intersectin is a major binding partner for the Ras exchange factor mSos1 in rat brain. Tong, X.K., Hussain, N.K., de Heuvel, E., Kurakin, A., Abi-Jaoude, E., Quinn, C.C., Olson, M.F., Marais, R., Baranes, D., Kay, B.K., McPherson, P.S. EMBO J. (2000) [Pubmed]

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