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

SKAP-HOM, a novel adaptor protein homologous to the FYN-associated protein SKAP55.

A recombinant GST-Fyn-SH2 domain was used to purify proteins from lysates of pervanadate treated EL4 cells. N-terminal sequencing and molecular cloning of one of the purified polypeptides resulted in the identification of a novel adaptor protein that shares strong structural homology to the recently cloned Fyn-associated adaptor protein SKAP55. This protein was termed SKAP-HOM (SKAP55 homologue). Despite their striking homology, SKAP55 and SKAP-HOM have distinct characteristics. Thus, unlike SKAP55, which is exclusively expressed in T lymphocytes, SKAP-HOM expression is ubiquitous. Furthermore, while SKAP55 is constitutively tyrosine phosphorylated in resting human T cells, SKAP-HOM is expressed as a non-phosphorylated protein in the absence of external stimulus but becomes phosphorylated following T cell activation. In addition, SKAP-HOM does not associate with p59fyn in T cells although it represents a specific substrate for the kinase in COS cells. Finally, we demonstrate that, as previously shown for SKAP55, SKAP-HOM interacts with the recently identified polypeptide SLAP-130.[1]


  1. SKAP-HOM, a novel adaptor protein homologous to the FYN-associated protein SKAP55. Marie-Cardine, A., Verhagen, A.M., Eckerskorn, C., Schraven, B. FEBS Lett. (1998) [Pubmed]
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