2vch

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{{STRUCTURE_2vch| PDB=2vch | SCENE= }}
{{STRUCTURE_2vch| PDB=2vch | SCENE= }}
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'''CHARACTERIZATION AND ENGINEERING OF THE BIFUNCTIONAL N- AND O-GLUCOSYLTRANSFERASE INVOLVED IN XENOBIOTIC METABOLISM IN PLANTS'''
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===CHARACTERIZATION AND ENGINEERING OF THE BIFUNCTIONAL N- AND O-GLUCOSYLTRANSFERASE INVOLVED IN XENOBIOTIC METABOLISM IN PLANTS===
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==Overview==
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The glucosylation of pollutant and pesticide metabolites in plants controls their bioactivity and the formation of subsequent chemical residues. The model plant Arabidopsis thaliana contains &gt;100 glycosyltransferases (GTs) dedicated to small-molecule conjugation and, whereas 44 of these enzymes catalyze the O-glucosylation of chlorinated phenols, only one, UGT72B1, shows appreciable N-glucosylating activity toward chloroanilines. UGT72B1 is a bifunctional O-glucosyltransferase (OGT) and N-glucosyltransferase (NGT). To investigate this unique dual activity, the structure of the protein was solved, at resolutions up to 1.45 A, in various forms including the Michaelis complex with intact donor analog and trichlorophenol acceptor. The catalytic mechanism and basis for O/N specificity was probed by mutagenesis and domain shuffling with an orthologous enzyme from Brassica napus (BnUGT), which possesses only OGT activity. Mutation of BnUGT at just two positions (D312N and F315Y) installed high levels of NGT activity. Molecular modeling revealed the connectivity of these residues to H19 on UGT72B1, with its mutagenesis exclusively defining NGT activity in the Arabidopsis enzyme. These results shed light on the conjugation of nonnatural substrates by plant GTs, highlighting the catalytic plasticity of this enzyme class and the ability to engineer unusual and desirable transfer to nitrogen-based acceptors.
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==About this Structure==
==About this Structure==
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[[Category: Transferase]]
[[Category: Transferase]]
[[Category: Udp-glucose- dependent]]
[[Category: Udp-glucose- dependent]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:03:22 2008''

Revision as of 14:03, 27 July 2008

Image:2vch.png

Template:STRUCTURE 2vch

CHARACTERIZATION AND ENGINEERING OF THE BIFUNCTIONAL N- AND O-GLUCOSYLTRANSFERASE INVOLVED IN XENOBIOTIC METABOLISM IN PLANTS

Template:ABSTRACT PUBMED 18077347

About this Structure

2VCH is a Single protein structure of sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA.

Reference

Characterization and engineering of the bifunctional N- and O-glucosyltransferase involved in xenobiotic metabolism in plants., Brazier-Hicks M, Offen WA, Gershater MC, Revett TJ, Lim EK, Bowles DJ, Davies GJ, Edwards R, Proc Natl Acad Sci U S A. 2007 Dec 18;104(51):20238-43. Epub 2007 Dec 12. PMID:18077347

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