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1a2o

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{{STRUCTURE_1a2o| PDB=1a2o | SCENE= }}
{{STRUCTURE_1a2o| PDB=1a2o | SCENE= }}
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'''STRUCTURAL BASIS FOR METHYLESTERASE CHEB REGULATION BY A PHOSPHORYLATION-ACTIVATED DOMAIN'''
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===STRUCTURAL BASIS FOR METHYLESTERASE CHEB REGULATION BY A PHOSPHORYLATION-ACTIVATED DOMAIN===
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==Overview==
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We report the x-ray crystal structure of the methylesterase CheB, a phosphorylation-activated response regulator involved in reversible modification of bacterial chemotaxis receptors. Methylesterase CheB and methyltransferase CheR modulate signaling output of the chemotaxis receptors by controlling the level of receptor methylation. The structure of CheB, which consists of an N-terminal regulatory domain and a C-terminal catalytic domain joined by a linker, was solved by molecular replacement methods using independent search models for the two domains. In unphosphorylated CheB, the N-terminal domain packs against the active site of the C-terminal domain and thus inhibits methylesterase activity by directly restricting access to the active site. We propose that phosphorylation of CheB induces a conformational change in the regulatory domain that disrupts the domain interface, resulting in a repositioning of the domains and allowing access to the active site. Structural similarity between the two companion receptor modification enzymes, CheB and CheR, suggests an evolutionary and/or functional relationship. Specifically, the phosphorylated N-terminal domain of CheB may facilitate interaction with the receptors, similar to the postulated role of the N-terminal domain of CheR. Examination of surfaces in the N-terminal regulatory domain of CheB suggests that despite a common fold throughout the response regulator family, surfaces used for protein-protein interactions differ significantly. Comparison between CheB and other response regulators indicates that analogous surfaces are used for different functions and conversely, similar functions are mediated by different molecular surfaces.
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{{ABSTRACT_PUBMED_9465023}}
==About this Structure==
==About this Structure==
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[[Category: Bacterial chemotaxis]]
[[Category: Bacterial chemotaxis]]
[[Category: Serine hydrolase]]
[[Category: Serine hydrolase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:43:00 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 15:52:02 2008''

Revision as of 12:52, 30 June 2008

Image:1a2o.png

Template:STRUCTURE 1a2o

STRUCTURAL BASIS FOR METHYLESTERASE CHEB REGULATION BY A PHOSPHORYLATION-ACTIVATED DOMAIN

Template:ABSTRACT PUBMED 9465023

About this Structure

1A2O is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.

Reference

Structural basis for methylesterase CheB regulation by a phosphorylation-activated domain., Djordjevic S, Goudreau PN, Xu Q, Stock AM, West AH, Proc Natl Acad Sci U S A. 1998 Feb 17;95(4):1381-6. PMID:9465023

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