2f6c

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{{STRUCTURE_2f6c| PDB=2f6c | SCENE= }}
{{STRUCTURE_2f6c| PDB=2f6c | SCENE= }}
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'''Reaction geometry and thermostability of pyranose 2-oxidase from the white-rot fungus Peniophora sp., Thermostability mutant E542K'''
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===Reaction geometry and thermostability of pyranose 2-oxidase from the white-rot fungus Peniophora sp., Thermostability mutant E542K===
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==Overview==
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Pyranose 2-oxidase catalyzes the oxidation of a number of carbohydrates using dioxygen; glucose, for example, is oxidized at carbon 2. The structure of pyranose 2-oxidase with the reaction product 2-keto-beta-d-glucose bound in the active center is reported in a new crystal form at 1.41 A resolution. The binding structure suggests that the alpha-anomer cannot be processed. The binding mode of the oxidized product was used to model other sugars accepted by the enzyme and to explain its specificity and catalytic rates. The reported structure at pH 6.0 shows a drastic conformational change in the loop of residues 454-461 (loop 454-461) at the active center compared to that of a closely homologous enzyme analyzed at pH 4.5 with a bound acetate inhibitor. In our structures, the loop is highly mobile and shifts to make way for the sugar to pass into the active center. Presumably, loop 454-461 functions as a gatekeeper. Apart from the wild-type enzyme, a thermostable variant was analyzed at 1.84 A resolution. In this variant, Glu542 is exchanged for a lysine. The observed stabilization could be a result of the mutated residue changing an ionic contact at a comparatively weak interface of the tetramer.
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(as it appears on PubMed at http://www.pubmed.gov), where 16716069 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16716069}}
==About this Structure==
==About this Structure==
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[[Category: Phbh fold]]
[[Category: Phbh fold]]
[[Category: Thermostability mutation]]
[[Category: Thermostability mutation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 03:30:50 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 13:23:23 2008''

Revision as of 10:23, 27 July 2008

Image:2f6c.png

Template:STRUCTURE 2f6c

Reaction geometry and thermostability of pyranose 2-oxidase from the white-rot fungus Peniophora sp., Thermostability mutant E542K

Template:ABSTRACT PUBMED 16716069

About this Structure

2F6C is a Single protein structure of sequence from Peniophora sp. sg. Full crystallographic information is available from OCA.

Reference

Reaction geometry and thermostable variant of pyranose 2-oxidase from the white-rot fungus Peniophora sp., Bannwarth M, Heckmann-Pohl D, Bastian S, Giffhorn F, Schulz GE, Biochemistry. 2006 May 30;45(21):6587-95. PMID:16716069

Page seeded by OCA on Sun Jul 27 13:23:23 2008

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