2iem

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[[Image:2iem.gif|left|200px]]
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{{STRUCTURE_2iem| PDB=2iem | SCENE= }}
{{STRUCTURE_2iem| PDB=2iem | SCENE= }}
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'''Solution structure of an oxidized form (Cys51-Cys198) of E. coli Methionine Sulfoxide Reductase A (MsrA)'''
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===Solution structure of an oxidized form (Cys51-Cys198) of E. coli Methionine Sulfoxide Reductase A (MsrA)===
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==Overview==
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Methionine sulfoxide reductases (Msr) reduce methionine sulfoxide (MetSO)-containing proteins, back to methionine (Met). MsrAs are stereospecific for the S epimer whereas MsrBs reduce the R epimer of MetSO. Although structurally unrelated, the Msrs characterized so far display a similar catalytic mechanism with formation of a sulfenic intermediate on the catalytic cysteine and a concomitant release of Met, followed by formation of at least one intramolecular disulfide bond (between the catalytic and a recycling cysteine), which is then reduced by thioredoxin. In the case of the MsrA from Escherichia coli, two disulfide bonds are formed, i.e. first between the catalytic Cys51 and the recycling Cys198 and then between Cys198 and the second recycling Cys206. Three crystal structures including E. coli and Mycobacterium tuberculosis MsrAs, which, for the latter, possesses only the unique recycling Cys198, have been solved so far. In these structures, the distances between the cysteine residues involved in the catalytic mechanism are too large to allow formation of the intramolecular disulfide bonds. Here structural and dynamical NMR studies of the reduced wild-type and the oxidized (Cys51-Cys198) forms of C86S/C206S MsrA from E. coli have been carried out. The mapping of MetSO substrate-bound C51A MsrA has also been performed. The data support (1) a conformational switch occurring subsequently to sulfenic acid formation and/or Met release that would be a prerequisite to form the Cys51-Cys198 bond and, (2) a high mobility of the C-terminal part of the Cys51-Cys198 oxidized form that would favor formation of the second Cys198-Cys206 disulfide bond.
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(as it appears on PubMed at http://www.pubmed.gov), where 17157315 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17157315}}
==About this Structure==
==About this Structure==
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2IEM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IEM OCA].
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2IEM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IEM OCA].
==Reference==
==Reference==
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[[Category: Methionine sulfoxide reductase some]]
[[Category: Methionine sulfoxide reductase some]]
[[Category: Nmr solution 3d structure]]
[[Category: Nmr solution 3d structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 07:24:56 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 03:58:54 2008''

Revision as of 00:58, 29 July 2008

Image:2iem.png

Template:STRUCTURE 2iem

Solution structure of an oxidized form (Cys51-Cys198) of E. coli Methionine Sulfoxide Reductase A (MsrA)

Template:ABSTRACT PUBMED 17157315

About this Structure

2IEM is a Single protein structure of sequence from Escherichia coli. Full experimental information is available from OCA.

Reference

Solution structure and backbone dynamics of the reduced form and an oxidized form of E. coli methionine sulfoxide reductase A (MsrA): structural insight of the MsrA catalytic cycle., Coudevylle N, Antoine M, Bouguet-Bonnet S, Mutzenhardt P, Boschi-Muller S, Branlant G, Cung MT, J Mol Biol. 2007 Feb 9;366(1):193-206. Epub 2006 Nov 14. PMID:17157315

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