Metabolic mechanisms of caffeine catalyzed by cytochrome P450 isoenzyme 1A2: a theoretical study

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• 作者：Zeqin Chen ; Yuan Kang ; Chenghua Zhang ; Jing Tao ; Ying Xue
• 关键词：Caffeine ; CYP1A2 ; N ; demethylation ; Hydroxylation ; Density functional theoretical calculation ; Kinetic isotope effect
• 刊名：Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta)
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：134
• 期：9
• 全文大小：5,621 KB
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• 作者单位：Zeqin Chen (1)
  Yuan Kang (1)
  Chenghua Zhang (2)
  Jing Tao (1)
  Ying Xue (3)
  
  1. College of Chemistry and Chemical Engineering, Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong, 637002, People’s Republic of China
  2. School of Basic Medical Sciences, North Sichuan Medical College, Nanchong, 637007, People’s Republic of China
  3. College of Chemistry, Key Laboratory of Green Chemistry and Technology in Ministry of Education, Sichuan University, Chengdu, 610064, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Theoretical and Computational Chemistry
  Inorganic Chemistry
  Organic Chemistry
  Physical Chemistry
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2234

文摘

Caffeine (CA), a universally used psychoactive substance in foods and drugs, can cause osteoporosis when taken in moderate-to-high doses. The metabolic mechanisms of CA catalyzed by cytochrome P450 isoenzyme 1A2 (CYP1A2) were systematically explored in this study based on DFT calculation. Four possible metabolic pathways were investigated, namely 1-N, 3-N, 7-N demethylations, and C-8 hydroxylation. The results determined the mechanistic details and revealed some notable features. The rate-limiting C _α –H hydroxylation for the N-demethylation mechanism proceeded predominantly through a hydrogen atom transfer mechanism with two-state reactivity. The generated carbinolamine decomposed in a non-enzymatic environment, especially through the adjacent heteroatom-assisted proton transfer. The rate-limiting step for C-8 hydroxylation involved the nucleophilic attack of the active Cpd I’s oxygen atom. Intriguingly, CA metabolic performance depended on the multiplicity of Cpd I. The 3-N demethylation metabolic mechanism predominated over the C-8 hydroxylation on the high-spin quartet state. Paraxanthine was the most energetically feasible metabolic product of CA. On the low-spin doublet state, however, C-8 hydroxylation had the lowest activation energy; hence, 1,3,7-trimethyluric acid was the optimum metabolic product of CA. All the results were in agreement with the experimental observation and can supply rational clues for the different metabolic performances of CA catalyzed by CYP1A2 in humans and rats. The calculated results in this study can provide more implications for the controversial amine N-dealkylation mechanisms by CYP and offer essential insights into bio-decaffeination techniques.