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| {{STRUCTURE_1cv9| PDB=1cv9 | SCENE= }} | | {{STRUCTURE_1cv9| PDB=1cv9 | SCENE= }} |
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| '''NMR STUDY OF ITAM PEPTIDE SUBSTRATE'''
| | ===NMR STUDY OF ITAM PEPTIDE SUBSTRATE=== |
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| ==Overview==
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| 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. | | The line below this paragraph, {{ABSTRACT_PUBMED_10748115}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 10748115 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_10748115}} |
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| ==About this Structure== | | ==About this Structure== |
| Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CV9 OCA]. | | Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CV9 OCA]. |
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| ==Reference== | | ==Reference== |
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| [[Category: Lyn tyrosine kinase]] | | [[Category: Lyn tyrosine kinase]] |
| [[Category: Peptide substate]] | | [[Category: Peptide substate]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:08:54 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 21:27:58 2008'' |