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2nst

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{{STRUCTURE_2nst| PDB=2nst | SCENE= }}
{{STRUCTURE_2nst| PDB=2nst | SCENE= }}
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'''Crystal structure of pectin methylesterase D178A mutant in complex with hexasaccharide II'''
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===Crystal structure of pectin methylesterase D178A mutant in complex with hexasaccharide II===
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==Overview==
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We provide a mechanism for the activity of pectin methylesterase (PME), the enzyme that catalyses the essential first step in bacterial invasion of plant tissues. The complexes formed in the crystal using specifically methylated pectins, together with kinetic measurements of directed mutants, provide clear insights at atomic resolution into the specificity and the processive action of the Erwinia chrysanthemi enzyme. Product complexes provide additional snapshots along the reaction coordinate. We previously revealed that PME is a novel aspartic-esterase possessing parallel beta-helix architecture and now show that the two conserved aspartates are the nucleophile and general acid-base in the mechanism, respectively. Other conserved residues at the catalytic centre are shown to be essential for substrate binding or transition state stabilisation. The preferential binding of methylated sugar residues upstream of the catalytic site, and demethylated residues downstream, drives the enzyme along the pectin molecule and accounts for the sequential pattern of demethylation produced by both bacterial and plant PMEs.
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(as it appears on PubMed at http://www.pubmed.gov), where 17717531 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17717531}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Michaelis complex]]
[[Category: Michaelis complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 09:52:12 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:45:07 2008''

Revision as of 20:45, 27 July 2008

Image:2nst.png

Template:STRUCTURE 2nst

Crystal structure of pectin methylesterase D178A mutant in complex with hexasaccharide II

Template:ABSTRACT PUBMED 17717531

About this Structure

2NST is a Single protein structure of sequence from Erwinia chrysanthemi. Full crystallographic information is available from OCA.

Reference

Molecular basis of the activity of the phytopathogen pectin methylesterase., Fries M, Ihrig J, Brocklehurst K, Shevchik VE, Pickersgill RW, EMBO J. 2007 Sep 5;26(17):3879-87. Epub 2007 Aug 23. PMID:17717531

Page seeded by OCA on Sun Jul 27 23:45:07 2008

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