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Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies

T-2 toxin, one of the type A trichothecenes, presents a potential hazard to human and animal health. Our previous work demonstrated that porcine cytochrome P450 3A29 (CYP3A29) played an important role in the hydroxylation of T-2 toxin. To identify amino acids involved in this metabolic process, T-2...

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Autores principales: Cheng, Guyue, Liu, Changcun, Wang, Xu, Ma, Hongmin, Pan, Yuanhu, Huang, Lingli, Hao, Haihong, Dai, Menghong, Yuan, Zonghui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4153680/
https://www.ncbi.nlm.nih.gov/pubmed/25184434
http://dx.doi.org/10.1371/journal.pone.0106769
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author Cheng, Guyue
Liu, Changcun
Wang, Xu
Ma, Hongmin
Pan, Yuanhu
Huang, Lingli
Hao, Haihong
Dai, Menghong
Yuan, Zonghui
author_facet Cheng, Guyue
Liu, Changcun
Wang, Xu
Ma, Hongmin
Pan, Yuanhu
Huang, Lingli
Hao, Haihong
Dai, Menghong
Yuan, Zonghui
author_sort Cheng, Guyue
collection PubMed
description T-2 toxin, one of the type A trichothecenes, presents a potential hazard to human and animal health. Our previous work demonstrated that porcine cytochrome P450 3A29 (CYP3A29) played an important role in the hydroxylation of T-2 toxin. To identify amino acids involved in this metabolic process, T-2 toxin was docked into a homology model of CYP3A29 based on a crystal structure of CYP3A4 using AutoDock 4.0. Nine residues of CYP3A29, Arg105, Arg106, Phe108, Ser119, Lys212, Phe213, Phe215, Arg372 and Glu374, which were found within 5 Å around T-2 toxin were subjected to site-directed mutagenesis. In the oxidation of nifedipine, the CL (int) value of R106A was increased by nearly two-folds compared with the wild-type CYP3A29, while the substrate affinities and CL (int) values of S119A and K212A were significantly reduced. In the hydroxylation of T-2 toxin, the generation of 3′-OH-T-2 by R105A, S119A and K212A was significantly less than that by the wild-type, whereas R106A slightly increased the generation of 3′-OH-T-2. These results were further confirmed by isothermal titration calorimetry analysis, suggesting that these four residues are important in the hydroxylation of T-2 toxin and Arg105 may be a specific recognition site for the toxin. Our study suggests a possible structure-function relationship of CYP3A29 in the hydroxylation of T-2 toxin, providing with new insights into the mechanism of CYP3A enzymes in the biotransformation of T-2 toxin.
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spelling pubmed-41536802014-09-05 Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies Cheng, Guyue Liu, Changcun Wang, Xu Ma, Hongmin Pan, Yuanhu Huang, Lingli Hao, Haihong Dai, Menghong Yuan, Zonghui PLoS One Research Article T-2 toxin, one of the type A trichothecenes, presents a potential hazard to human and animal health. Our previous work demonstrated that porcine cytochrome P450 3A29 (CYP3A29) played an important role in the hydroxylation of T-2 toxin. To identify amino acids involved in this metabolic process, T-2 toxin was docked into a homology model of CYP3A29 based on a crystal structure of CYP3A4 using AutoDock 4.0. Nine residues of CYP3A29, Arg105, Arg106, Phe108, Ser119, Lys212, Phe213, Phe215, Arg372 and Glu374, which were found within 5 Å around T-2 toxin were subjected to site-directed mutagenesis. In the oxidation of nifedipine, the CL (int) value of R106A was increased by nearly two-folds compared with the wild-type CYP3A29, while the substrate affinities and CL (int) values of S119A and K212A were significantly reduced. In the hydroxylation of T-2 toxin, the generation of 3′-OH-T-2 by R105A, S119A and K212A was significantly less than that by the wild-type, whereas R106A slightly increased the generation of 3′-OH-T-2. These results were further confirmed by isothermal titration calorimetry analysis, suggesting that these four residues are important in the hydroxylation of T-2 toxin and Arg105 may be a specific recognition site for the toxin. Our study suggests a possible structure-function relationship of CYP3A29 in the hydroxylation of T-2 toxin, providing with new insights into the mechanism of CYP3A enzymes in the biotransformation of T-2 toxin. Public Library of Science 2014-09-03 /pmc/articles/PMC4153680/ /pubmed/25184434 http://dx.doi.org/10.1371/journal.pone.0106769 Text en © 2014 Cheng et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Cheng, Guyue
Liu, Changcun
Wang, Xu
Ma, Hongmin
Pan, Yuanhu
Huang, Lingli
Hao, Haihong
Dai, Menghong
Yuan, Zonghui
Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies
title Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies
title_full Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies
title_fullStr Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies
title_full_unstemmed Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies
title_short Structure-Function Analysis of Porcine Cytochrome P450 3A29 in the Hydroxylation of T-2 Toxin as Revealed by Docking and Mutagenesis Studies
title_sort structure-function analysis of porcine cytochrome p450 3a29 in the hydroxylation of t-2 toxin as revealed by docking and mutagenesis studies
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4153680/
https://www.ncbi.nlm.nih.gov/pubmed/25184434
http://dx.doi.org/10.1371/journal.pone.0106769
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