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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Distinct binding patterns of HS1 to the Src SH2 and SH3 domains reflect possible mechanisms of recruitment and activation of downstream molecules.

We previously identified a gene, LckBP1, which encodes a protein that binds to the Lck SH3 domain and is identical to murine SH1. Using unstimulated T lymphocytes, we further demonstrated that Lck binds to HS1 in vivo and that HS1 is tyrosine phosphorylated upon TCR stimulation. In the present report, we analyzed the binding pattern of several src kinases and HS1 in greater detail. The Lck SH3 domain binds to HS1 constitutively, while the Lck SH2 domain associates with HS1 only upon TCR stimulation. A similar binding pattern was observed with Lyn and HS1, but not with Fyn and HS1, in which the Fyn SH2 region associates with HS1 upon TCR stimulation but the Fyn SH3 region does not associate with HS1 regardless of TCR stimulation. Such distinct binding patterns of the src kinase SH2 and SH3 domains to HS1 may represent a mechanism by which src family kinases select substrates and activate particular downstream signaling pathways.[1]

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