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Default NMR structure of phospho-tyrosine signaling complexes.

NMR structure of phospho-tyrosine signaling complexes.

Related Articles NMR structure of phospho-tyrosine signaling complexes.

Med Res Rev. 1999 Jul;19(4):295-305

Authors: Post CB, Gaul BS, Eisenmesser EZ, Schneider ML

A structural basis for activation and substrate specificity of src tyrosine kinases, and regulation of protein-protein association by tyrosine phosphorylation is described. Lyn, a src-family tyrosine kinase, recognizes and phosphorylates the immunoreceptor tyrosine-based activation motif, ITAM, a critical component in transmembrane signal transduction in hemopoietic cells. The structure of an ITAM peptide substrate bound to an active form of Lyn tyrosine kinase was determined by high-resolution NMR, and a model of the complex was generated using the crystallographic structure of Lck, a closely related Src-family kinase. The results provide a rationale for the conserved ITAM residues and specificity of Lyn, and suggest that substrate plays a role in stabilizing the kinase conformation optimal for catalysis. It is our hope that the Lck-ITAM peptide model complex will be useful in aiding structure-based drug design efforts that target substrate binding determinants in the design. Concerning the regulation of protein-protein association, we report on a complex between erythrocyte band 3 and two glycolytic enzymes, aldolase and glyceraldehyde-3-phosphate dehydrogenase. The formation of this complex is negatively regulated by tyrosine phosphorylation of band 3 by p72syk tyrosine kinase. In red blood cells, this association results in a decrease in glycolysis due to competitive inhibition of the glycolytic enzymes. The structure of band 3 recognized by the glycolytic enzymes was determined by solution NMR, and found to be a loop structure with tyrosine centrally positioned and excluded from intermolecular contact. This phosphorylation sensitive interaction, or PSI, loop may be the basis of a general mechanism for negative regulation through tyrosine phosphorylation.

PMID: 10398926 [PubMed - indexed for MEDLINE]



Source: PubMed
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