1CV9
NMR STUDY OF ITAM PEPTIDE SUBSTRATE
Summary for 1CV9
| Entry DOI | 10.2210/pdb1cv9/pdb |
| Descriptor | IG-ALPHA ITAM PEPTIDE (1 entity in total) |
| Functional Keywords | lyn tyrosine kinase, itam, immunoreceptor tyrosine activation motif, peptide substate, immune system |
| Total number of polymer chains | 1 |
| Total formula weight | 1433.46 |
| Authors | Gaul, B.S.,Harrison, M.L.,Geahlen, R.L.,Post, C.B. (deposition date: 1999-08-23, release date: 1999-08-31, Last modification date: 2024-10-16) |
| Primary citation | Gaul, B.S.,Harrison, M.L.,Geahlen, R.L.,Burton, R.A.,Post, C.B. Substrate recognition by the Lyn protein-tyrosine kinase. NMR structure of the immunoreceptor tyrosine-based activation motif signaling region of the B cell antigen receptor. J.Biol.Chem., 275:16174-16182, 2000 Cited by PubMed Abstract: The immunoreceptor tyrosine-based activation motif (ITAM) plays a central role in transmembrane signal transduction in hematopoietic cells by mediating responses leading to proliferation and differentiation. An initial signaling event following activation of the B cell antigen receptor is phosphorylation of the CD79a (Ig-alpha) ITAM by Lyn, a Src family protein-tyrosine kinase. To elucidate the structural basis for recognition between the ITAM substrate and activated Lyn kinase, the structure of an ITAM-derived peptide bound to Lyn was determined using exchange-transferred nuclear Overhauser NMR spectroscopy. The bound substrate structure has an irregular helix-like character. Docking based on the NMR data into the active site of the closely related Lck kinase strongly favors ITAM binding in an orientation similar to binding of cyclic AMP-dependent protein kinase rather than that of insulin receptor tyrosine kinase. The model of the complex provides a rationale for conserved ITAM residues, substrate specificity, and suggests that substrate binds only the active conformation of the Src family tyrosine kinase, unlike the ATP cofactor, which can bind the inactive form. PubMed: 10748115DOI: 10.1074/jbc.M909044199 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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