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. 1994 Jul 5;91(14):6486–6490. doi: 10.1073/pnas.91.14.6486

Interaction of Grb2 via its Src homology 3 domains with synaptic proteins including synapsin I.

P S McPherson 1, A J Czernik 1, T J Chilcote 1, F Onofri 1, F Benfenati 1, P Greengard 1, J Schlessinger 1, P De Camilli 1
PMCID: PMC44227  PMID: 8022809

Abstract

Grb2 is a 25-kDa adaptor protein composed of a Src homology 2 (SH2) domain and two flanking Src homology 3 (SH3) domains. One function of Grb2 is to couple tyrosine-phosphorylated proteins (through its SH2 domain) to downstream effectors (through its SH3 domains). Using an overlay assay, we have identified four major Grb2-binding proteins in synaptic fractions. These proteins interact with wild-type Grb2 but not with Grb2 containing point mutations in each of its two SH3 domains corresponding to the loss of function mutants in the Caenorhabditis elegans Grb2 homologue sem-5. Two of the proteins, mSos and dynamin, were previously shown to bind Grb2. The third protein of 145 kDa is brain specific and to our knowledge has not been previously described. The fourth protein is synapsin I. Dynamin is required for synaptic vesicle endocytosis and synapsin I is thought to mediate the interaction of synaptic vesicles with the presynaptic cytomatrix. These data suggest that Grb2, or other proteins containing SH3 domains, may play a role in the regulation of the exo/endocytotic cycle of synaptic vesicles and therefore of neurotransmitter release.

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Selected References

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