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1csy

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{{STRUCTURE_1csy| PDB=1csy | SCENE= }}
{{STRUCTURE_1csy| PDB=1csy | SCENE= }}
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'''SYK TYROSINE KINASE C-TERMINAL SH2 DOMAIN COMPLEXED WITH A PHOSPHOPEPTIDEFROM THE GAMMA CHAIN OF THE HIGH AFFINITY IMMUNOGLOBIN G RECEPTOR, NMR'''
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===SYK TYROSINE KINASE C-TERMINAL SH2 DOMAIN COMPLEXED WITH A PHOSPHOPEPTIDEFROM THE GAMMA CHAIN OF THE HIGH AFFINITY IMMUNOGLOBIN G RECEPTOR, NMR===
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==Overview==
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BACKGROUND: Recruitment of the intracellular tyrosine kinase Syk to activated immune-response receptors is a critical early step in intracellular signaling. In mast cells, Syk specifically associates with doubly phosphorylated immunoreceptor tyrosine-based activation motifs (ITAMs) that are found within the IgE receptor. The mechanism by which Syk recognizes these motifs is not fully understood. Both Syk SH2 (Src homology 2) domains are required for high-affinity binding to these motifs, but the C-terminal SH2 domain (Syk-C) can function independently and can bind, in isolation, to the tyrosine-phosphorylated IgE receptor in vitro. In order to improve understanding of the cellular function of Syk, we have determined the solution structure of Syk-C complexed with a phosphotyrosine peptide derived from the gamma subunit of the IgE receptor. RESULTS: The Syk-C:peptide structure is compared with liganded structures of both the SH2 domain of Src and the C-terminal SH2 domain of ZAP-70 (the 70 kDa zeta-associated protein). The topologies of these domains are similar, although significant differences occur in the loop regions. In the Syk-C structure, the phosphotyrosine and leucine residues of the peptide ligand interact with pockets on the protein, and the intervening residues are extended. CONCLUSIONS: Syk-C resembles other SH2 domains in its peptide-binding interactions and overall topology, a result that is consistent with its ability to function as an independent SH2 domain in vitro. This result suggests that Syk-C plays a unique role in the intact Syk protein. The determinants of the binding affinity and selectivity of Syk-C may reside in the least-conserved structural elements that comprise the phosphotyrosine- and leucine-binding sites. These structural features can be exploited for the design of Syk-selective SH2 antagonists for the treatment of allergic disorders and asthma.
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{{ABSTRACT_PUBMED_8590001}}
==About this Structure==
==About this Structure==
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1CSY is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CSY OCA].
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1CSY is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CSY OCA].
==Reference==
==Reference==
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[[Category: Zydowsky, L D.]]
[[Category: Zydowsky, L D.]]
[[Category: Protein-tyrosine kinase sh2 domain]]
[[Category: Protein-tyrosine kinase sh2 domain]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:04:54 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 21:18:56 2008''

Revision as of 18:19, 30 June 2008

Image:1csy.png

Template:STRUCTURE 1csy

SYK TYROSINE KINASE C-TERMINAL SH2 DOMAIN COMPLEXED WITH A PHOSPHOPEPTIDEFROM THE GAMMA CHAIN OF THE HIGH AFFINITY IMMUNOGLOBIN G RECEPTOR, NMR

Template:ABSTRACT PUBMED 8590001

About this Structure

1CSY is a Single protein structure of sequence from Homo sapiens. Full experimental information is available from OCA.

Reference

Solution structure of the C-terminal SH2 domain of the human tyrosine kinase Syk complexed with a phosphotyrosine pentapeptide., Narula SS, Yuan RW, Adams SE, Green OM, Green J, Philips TB, Zydowsky LD, Botfield MC, Hatada M, Laird ER, et al., Structure. 1995 Oct 15;3(10):1061-73. PMID:8590001

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