How PBDEs Are Transformed into Dihydroxylated and Dioxin Metabolites Catalyzed by the Active Center of Cytochrome P450s: A DFT Study | |
Fu, Zhiqiang1; Wang Y(王永)2; Chen, Jingwen1; Wang, Zhongyu1; Wang, Xingbao3 | |
刊名 | Environmental Science and Technology |
2016 | |
卷号 | 50期号:15页码:8155-8163 |
ISSN号 | 0013-936X |
通讯作者 | Chen, Jingwen |
英文摘要 | Predicting metabolism of chemicals and potential toxicities of relevant metabolites remains a vital and difficult task in risk assessment. Recent findings suggested that polybrominated diphenyl ethers (PBDEs) can be transformed into dihydroxylated and dioxin metabolites catalyzed by cytochrome P450 enzymes (CYPs), whereas the mechanisms pertinent to these transformations remain largely unknown. Here, by means of density functional theory (DFT) calculations, we probed the metabolic pathways of 2,2′,4,4′-tetraBDE (BDE-47) using the active center model of CYPs (Compound I). Results show that BDE-47 is first oxidized to monohydroxylated products (HO-BDEs), wherein a keto–enol tautomerism is identified for rearrangement of the cyclohexenone intermediate. Dihydroxylation with HO-BDEs as precursors, has a unique phenolic H-abstraction and hydroxyl rebound pathway that is distinct from that for monohydroxylation, which accounts for the absence of epoxides in in vitro studies. Furthermore, we found only dihydroxylated PBDEs with heterophenyl −OH substituents ortho- and meta- to the ether bond serve as precursors for dioxins, which are evolved from aryl biradical coupling of diketone intermediates that are produced from dehydrogenation of the dihydroxylated PBDEs by Compound I. This study may enlighten the development of computational models that afford mechanism-based prediction of the xenobiotic biotransformation catalyzed by CYPs. |
学科主题 | 物理化学与绿色催化 |
收录类别 | SCI |
资助信息 | the National Basic Research Program (2013CB430403);the National Natural Science Foundation of China (21137001;21325729;21173211) |
语种 | 英语 |
WOS记录号 | WOS:000381063200025 |
内容类型 | 期刊论文 |
源URL | [http://210.77.64.217/handle/362003/20311] |
专题 | 兰州化学物理研究所_OSSO国家重点实验室 |
作者单位 | 1.Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian 116024, Peoples R China 2.Chinese Acad Sci, LICP, Suzhou Res Inst, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China 3.Dalian Univ Technol, Sch Pharmaceut Sci & Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China |
推荐引用方式 GB/T 7714 | Fu, Zhiqiang,Wang Y,Chen, Jingwen,et al. How PBDEs Are Transformed into Dihydroxylated and Dioxin Metabolites Catalyzed by the Active Center of Cytochrome P450s: A DFT Study[J]. Environmental Science and Technology,2016,50(15):8155-8163. |
APA | Fu, Zhiqiang,Wang Y,Chen, Jingwen,Wang, Zhongyu,&Wang, Xingbao.(2016).How PBDEs Are Transformed into Dihydroxylated and Dioxin Metabolites Catalyzed by the Active Center of Cytochrome P450s: A DFT Study.Environmental Science and Technology,50(15),8155-8163. |
MLA | Fu, Zhiqiang,et al."How PBDEs Are Transformed into Dihydroxylated and Dioxin Metabolites Catalyzed by the Active Center of Cytochrome P450s: A DFT Study".Environmental Science and Technology 50.15(2016):8155-8163. |
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