1lfk: Difference between revisions

Revision as of 20:07, 2 July 2008

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File:1lfk.png

Template:STRUCTURE 1lfk

Crystal structure of OxyB, a Cytochrome P450 Implicated in an Oxidative Phenol Coupling Reaction During Vancomycin BiosynthesisCrystal structure of OxyB, a Cytochrome P450 Implicated in an Oxidative Phenol Coupling Reaction During Vancomycin Biosynthesis

Template:ABSTRACT PUBMED 12207020

About this StructureAbout this Structure

1LFK is a Single protein structure of sequence from Amycolatopsis orientalis. Full crystallographic information is available from OCA.

ReferenceReference

Crystal structure of OxyB, a cytochrome P450 implicated in an oxidative phenol coupling reaction during vancomycin biosynthesis., Zerbe K, Pylypenko O, Vitali F, Zhang W, Rouset S, Heck M, Vrijbloed JW, Bischoff D, Bister B, Sussmuth RD, Pelzer S, Wohlleben W, Robinson JA, Schlichting I, J Biol Chem. 2002 Dec 6;277(49):47476-85. Epub 2002 Aug 30. PMID:12207020

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-'''Crystal structure of OxyB, a Cytochrome P450 Implicated in an Oxidative Phenol Coupling Reaction During Vancomycin Biosynthesis'''
+===Crystal structure of OxyB, a Cytochrome P450 Implicated in an Oxidative Phenol Coupling Reaction During Vancomycin Biosynthesis===
-==Overview==
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-Gene-inactivation studies point to the involvement of OxyB in catalyzing the first oxidative phenol coupling reaction during glycopeptide antibiotic biosynthesis. The oxyB gene has been cloned and sequenced from the vancomycin producer Amycolatopsis orientalis, and the hemoprotein has been produced in Escherichia coli, crystallized, and its structure determined to 1.7-A resolution. OxyB gave UV-visible spectra characteristic of a P450-like hemoprotein in the low spin ferric state. After reduction to the ferrous state by dithionite or by spinach ferredoxin and ferredoxin reductase, the CO-ligated form gave a 450-nm peak in a UV-difference spectrum. Addition of putative heptapeptide substrates to resting OxyB produced type I changes to the UV spectrum, but no turnover was observed in the presence of ferredoxin and ferredoxin reductase, showing that either the peptides or the reduction system, or both, are insufficient to support a full catalytic cycle. OxyB exhibits the typical P450-fold, with helix L containing the signature sequence FGHGXHXCLG and Cys(347) being the proximal axial thiolate ligand of the heme iron. The structural similarity of OxyB is highest to P450nor, P450terp, CYP119, and P450eryF. In OxyB, the F and G helices are rotated out of the active site compared with P450nor, resulting in a much more open active site, consistent with the larger size of the presumed heptapeptide substrate.
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 ==About this Structure==
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 [[Category: Zhang, W.]]
 [[Category: Oxidative phenol coupling reaction p450 vancomycin]]
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