1ka6: Difference between revisions
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|PDB= 1ka6 |SIZE=350|CAPTION= <scene name='initialview01'>1ka6</scene> | |PDB= 1ka6 |SIZE=350|CAPTION= <scene name='initialview01'>1ka6</scene> | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand=NH2:AMINO GROUP'>NH2</scene> | |LIGAND= <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene>, <scene name='pdbligand=PTR:O-PHOSPHOTYROSINE'>PTR</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY=[[1ka7|1KA7]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ka6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ka6 OCA], [http://www.ebi.ac.uk/pdbsum/1ka6 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ka6 RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
The SH2 domain protein SAP/SH2D1A, encoded by the X-linked lymphoproliferative (XLP) syndrome gene, associates with the hematopoietic cell surface receptor SLAM in a phosphorylation-independent manner. By screening a repertoire of synthetic peptides, the specificity of SAP/SH2D1A has been mapped and a consensus sequence motif for binding identified, T/S-x-x-x-x-V/I, where x represents any amino acid. Remarkably, this motif contains neither a Tyr nor a pTyr residue, a hallmark of conventional SH2 domain-ligand interactions. The structures of the protein, determined by NMR, in complex with two distinct peptides provide direct evidence in support of a "three-pronged" binding mechanism for the SAP/SH2D1A SH2 domain in contrast to the "two-pronged" binding for conventional SH2 domains. Differences in the structures of the two complexes suggest considerable flexibility in the SH2 domain, as further confirmed and characterized by hydrogen exchange studies. The structures also explain binding defects observed in disease-causing SAP/SH2D1A mutants and suggest that phosphorylation-independent interactions mediated by SAP/SH2D1A likely play an important role in the pathogenesis of XLP. | The SH2 domain protein SAP/SH2D1A, encoded by the X-linked lymphoproliferative (XLP) syndrome gene, associates with the hematopoietic cell surface receptor SLAM in a phosphorylation-independent manner. By screening a repertoire of synthetic peptides, the specificity of SAP/SH2D1A has been mapped and a consensus sequence motif for binding identified, T/S-x-x-x-x-V/I, where x represents any amino acid. Remarkably, this motif contains neither a Tyr nor a pTyr residue, a hallmark of conventional SH2 domain-ligand interactions. The structures of the protein, determined by NMR, in complex with two distinct peptides provide direct evidence in support of a "three-pronged" binding mechanism for the SAP/SH2D1A SH2 domain in contrast to the "two-pronged" binding for conventional SH2 domains. Differences in the structures of the two complexes suggest considerable flexibility in the SH2 domain, as further confirmed and characterized by hydrogen exchange studies. The structures also explain binding defects observed in disease-causing SAP/SH2D1A mutants and suggest that phosphorylation-independent interactions mediated by SAP/SH2D1A likely play an important role in the pathogenesis of XLP. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Pawson, T.]] | [[Category: Pawson, T.]] | ||
[[Category: Terhorst, C.]] | [[Category: Terhorst, C.]] | ||
[[Category: protein-peptide complex]] | [[Category: protein-peptide complex]] | ||
[[Category: sh2 domain]] | [[Category: sh2 domain]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:45:39 2008'' | ||
