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Novel inhibitors of a Grb2 SH3C domain interaction identified by a virtual screen.


ABSTRACT: The adaptor protein Grb2 links cell-surface receptors, such as Her2, to the multisite docking proteins Gab1 and 2, leading to cell growth and proliferation in breast and other cancers. Gab2 interacts with the C-terminal SH3 domain (SH3C) of Grb2 through atypical RxxK motifs within polyproline II or 310 helices. A virtual screen was conducted for putative binders of the Grb2 SH3C domain. Of the top hits, 34 were validated experimentally by surface plasmon resonance spectroscopy and isothermal titration calorimetry. A subset of these molecules was found to inhibit the Grb2-Gab2 interaction in a competition assay, with moderate to low affinities (5: IC50 320?M). The most promising binders were based on a dihydro-s-triazine scaffold, and are the first small molecules reported to target the Grb2 SH3C protein-interaction surface.

SUBMITTER: Simister PC 

PROVIDER: S-EPMC3594550 | biostudies-literature | 2013 Jul

REPOSITORIES: biostudies-literature

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Novel inhibitors of a Grb2 SH3C domain interaction identified by a virtual screen.

Simister Philip C PC   Luccarelli James J   Thompson Sam S   Appella Daniel H DH   Feller Stephan M SM   Hamilton Andrew D AD  

Bioorganic & medicinal chemistry 20121027 14


The adaptor protein Grb2 links cell-surface receptors, such as Her2, to the multisite docking proteins Gab1 and 2, leading to cell growth and proliferation in breast and other cancers. Gab2 interacts with the C-terminal SH3 domain (SH3C) of Grb2 through atypical RxxK motifs within polyproline II or 310 helices. A virtual screen was conducted for putative binders of the Grb2 SH3C domain. Of the top hits, 34 were validated experimentally by surface plasmon resonance spectroscopy and isothermal tit  ...[more]

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