Document Detail


Investigation of the Substrate Range of CYP199A4: Modification of the Partition between Hydroxylation and Desaturation Activities by Substrate and Protein Engineering.
MedLine Citation:
PMID:  23135838     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The cytochrome P450 enzyme CYP199A4, from Rhodopseudomonas palustris HaA2, can efficiently demethylate 4-methoxybenzoic acid. It is also capable of oxidising a range of other related substrates. By investigating substrates with different substituents and ring systems we have been able to show that the carboxylate group and the nature of the ring system and the substituent are all important for optimal substrate binding and activity. The structures of the veratric acid, 2-naphthoic acid and indole-6-carboxylic acid substrate-bound CYP199A4 complexes reveal the substrate binding modes and the side-chain conformational changes of the active site residues to accommodate these larger substrates. They also provide a rationale for the selectivity of product oxidation. The oxidation of alkyl substituted benzoic acids by CYP199A4 is more complex, with desaturation reactions competing with hydroxylation activity. The structure of 4-ethylbenzoic acid-bound CYP199A4 revealed that the substrate is held in a similar position to 4-methoxybenzoic acid, and that the C(β) CH bonds of the ethyl group are closer to the heme iron than those of the C(α) (3.5 vs. 4.8 Å). This observation, when coupled to the relative energies of the reaction intermediates, indicates that the positioning of the alkyl group relative to the heme iron may be critical in determining the amount of desaturation that is observed. By mutating a single residue in the active site of CYP199A4 (Phe185) we were able to convert the enzyme into a 4-ethylbenzoic acid desaturase.
Authors:
Stephen G Bell; Ruimin Zhou; Wen Yang; Adrian B H Tan; Alexander S Gentleman; Luet-Lok Wong; Weihong Zhou
Related Documents :
24953948 - Identification and development of 2-methylimidazo[1,2-a]pyridine-3-carboxamides as myco...
23681768 - A detective story in drug discovery: elucidation of a screening artifact reveals polyme...
24983918 - Ring flips revisited: 13c relaxation dispersion measurements of aromatic side chain dyn...
23700798 - Alpha-glucosidase and alpha-amylase inhibitory activities of saponins from traditional ...
12192078 - Alpha(1)-proteinase inhibitor mutants with specificity for plasma kallikrein and c1s bu...
827308 - Location of accessible bases in escherichia coli formylmethionine transfer rna as deter...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-7
Journal Detail:
Title:  Chemistry (Weinheim an der Bergstrasse, Germany)     Volume:  -     ISSN:  1521-3765     ISO Abbreviation:  Chemistry     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9513783     Medline TA:  Chemistry     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Affiliation:
Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR (UK); School of Chemistry and Physics, University of Adelaide, SA 5005 (Australia). stephen.bell@adelaide.edu.au.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  The Surgical Management of Active Ulcerative Colitis Complicated by Clostridium difficile Infection.
Next Document:  Regioselective C?H Alkylation of Anisoles with Olefins Catalyzed by Cationic Half-Sandwich Rare Eart...