期刊
EMBO JOURNAL
卷 20, 期 3, 页码 457-465出版社
WILEY
DOI: 10.1093/emboj/20.3.457
关键词
PAK; PIX; PKL; signal transduction; TCR
资金
- NCI NIH HHS [R01 CA072531, CA72531] Funding Source: Medline
Given the importance of the Rho GTPase family member Rad and the Rac1/Cdc42 effector PAK1 in T-cell activation, we investigated the requirements for their activation by the T-cell receptor (TCR), Rad and PAK1 activation required the tyrosine kinases ZAP-70 and Syk, but not the cytoplasmic adaptor Slp-76, Surprisingly, PAK1 was activated in the absence of the transmembrane adaptor LAT while Rad was not. However, efficient PAK1 activation required its binding sites for Rho GTPases and for PIX, a guanine nucleotide exchange factor for Rho GTPases, The overexpression of beta PIX that either cannot bind PAK1 or lacks GEF function blocked PAK1 activation. These data suggest that PAK1-PIX complex is recruited to appropriate sites for activation and that PIX is required for Rho family GTPase activation upstream of PAK1, Furthermore, we detected a stable trimolecular complex of PAK1, PIX and the paxillin kinase linker p95PKL, Taken together, these data show that PAK1 contained in this trimolecular complex is activated by a novel LAT-and Slp-76-independent pathway following TCR stimulation.
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