2cbl: Difference between revisions

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[[Image:2cbl.gif|left|200px]]
{{Seed}}
[[Image:2cbl.png|left|200px]]


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{{STRUCTURE_2cbl|  PDB=2cbl  |  SCENE=  }}  
{{STRUCTURE_2cbl|  PDB=2cbl  |  SCENE=  }}  


'''N-TERMINAL DOMAIN OF CBL IN COMPLEX WITH ITS BINDING SITE ON ZAP-70'''
===N-TERMINAL DOMAIN OF CBL IN COMPLEX WITH ITS BINDING SITE ON ZAP-70===




==Overview==
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Cbl is an adaptor protein that functions as a negative regulator of many signalling pathways that start from receptors at the cell surface. The evolutionarily conserved amino-terminal region of Cbl (Cbl-N) binds to phosphorylated tyrosine residues and has cell-transforming activity. Point mutations in Cbl that disrupt its recognition of phosphotyrosine also interfere with its negative regulatory function and, in the case of v-cbl, with its oncogenic potential. In T cells, Cbl-N binds to the tyrosine-phosphorylated inhibitory site of the protein tyrosine kinase ZAP-70. Here we describe the crystal structure of Cbl-N, both alone and in complex with a phosphopeptide that represents its binding site in ZAP-70. The structures show that Cbl-N is composed of three interacting domains: a four-helix bundle (4H), an EF-hand calcium-binding domain, and a divergent SH2 domain that was not recognizable from the amino-acid sequence of the protein. The calcium-bound EF hand wedges between the 4H and SH2 domains and roughly determines their relative orientation. In the ligand-occupied structure, the 4H domain packs against the SH2 domain and completes its phosphotyrosine-recognition pocket. Disruption of this binding to ZAP-70 as a result of structure-based mutations in the 4H, EF-hand and SH2 domains confirms that the three domains together form an integrated phosphoprotein-recognition module.
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{{ABSTRACT_PUBMED_10078535}}


==About this Structure==
==About this Structure==
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[[Category: Sh2]]
[[Category: Sh2]]
[[Category: Signal transduction]]
[[Category: Signal transduction]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 13:46:19 2008''

Revision as of 10:46, 28 July 2008

File:2cbl.png

Template:STRUCTURE 2cbl

N-TERMINAL DOMAIN OF CBL IN COMPLEX WITH ITS BINDING SITE ON ZAP-70

Template:ABSTRACT PUBMED 10078535

About this Structure

2CBL is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structure of the amino-terminal domain of Cbl complexed to its binding site on ZAP-70 kinase., Meng W, Sawasdikosol S, Burakoff SJ, Eck MJ, Nature. 1999 Mar 4;398(6722):84-90. PMID:10078535

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