Ontology type: schema:ScholarlyArticle
1996-12
AUTHORSHiroto Yamaguchi, Wayne A. Hendrickson
ABSTRACTREGULATION through phosphorylation is a characteristic of signalling pathways1,2, and the lymphocyte kinase Lck (p56 lck) both performs phosphorylation and is affected by it. Lck is a Src-family tyrosine kinase expressed in T lymphocytes, where it participates in the cellular immune response 3. Like all Src homologues, it comprises SH3, SH2 and kinase domains. Lck associates through its distinctive ammo-terminal segment with the cytoplasmic tails of either T-cell co-receptor, CD4 or CD8-α 4,5. Activated Lck phosphorylates T-cell receptor ε-chains, which then recruit the ZAP70 kinase to promote T-cell activation 6. Lck is activated by autophosphorylation at Tyr394 in the activation loop 7 and it is inactive when Tyr 505 near the carboxy terminus is phosphorylated and interacts with its own SH2 domain8. Here we report the crystal structure of the Lck tyrosine kinase domain (LCKK) in its activated state at 1.7 Å resolution. The structure reveals how a phosphoryl group at Tyr 394 generates a competent active site. Comparisons with other kinase structures indicate that tyrosine phophophorylation and ligand binding may in general elicit two distinct hinge-like movements between the kinase subdomains. From modelling studies, we suggest a basis for inhibition by phosphorylation at Tyr 505. More... »
PAGES484-489
http://scigraph.springernature.com/pub.10.1038/384484a0
DOIhttp://dx.doi.org/10.1038/384484a0
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/8945479
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