Knowledge Management System of Northwest Institute of Plateau Biology, CAS
Theoretical studies on the common catalytic mechanism of transketolase by using simplified models | |
Sheng, Xiang ; Liu, Yongjun ; Liu, Chengbu | |
2013-02-01 | |
发表期刊 | JOURNAL OF MOLECULAR GRAPHICS & MODELLING ; Sheng, X; Liu, YJ; Liu, CB.Theoretical studies on the common catalytic mechanism of transketolase by using simplified models,JOURNAL OF MOLECULAR GRAPHICS & MODELLING,2013,39():23-28 |
摘要 | Transketolase is a convenient model system to study enzymatic thiamin catalysis. By using density functional theory (DFT) method, the transfer mechanism of a 2-carbon fragment between a donor ketose X5P and an acceptor aldose R5P catalyzed by transketolase has been studied on simplified models. The calculation results indicate that the whole reaction cycle contains several proton transfer processes as well as C-C bond formation and cleavage steps. Each C-C bond formation or cleavage step is always accompanied by a proton transfer process, which follows a concerted but asynchronous mechanism. The C-C bond formation is always prior to the proton transfer, and the C-C bond cleavage is always later than proton transfer, suggesting that the C-C bond ligation facilitates the proton transfer, and proton transfer promotes the C-C bond cleavage. In the first half- and second half-reactions, the energy barriers of C-C bond formations are always higher than those of C-C bond cleavages. The 4-amino group of cofactor ThDP and histidine residue can act as the proton donor/acceptor during the catalytic reaction. (C) 2012 Elsevier Inc. All rights reserved. |
出版者 | ELSEVIER SCIENCE INC |
文献类型 | 期刊论文 |
条目标识符 | http://210.75.249.4/handle/363003/42215 |
专题 | 中国科学院西北高原生物研究所 |
推荐引用方式 GB/T 7714 | Sheng, Xiang,Liu, Yongjun,Liu, Chengbu. Theoretical studies on the common catalytic mechanism of transketolase by using simplified models[J]. JOURNAL OF MOLECULAR GRAPHICS & MODELLING, Sheng, X; Liu, YJ; Liu, CB.Theoretical studies on the common catalytic mechanism of transketolase by using simplified models,JOURNAL OF MOLECULAR GRAPHICS & MODELLING,2013,39():23-28,2013. |
APA | Sheng, Xiang,Liu, Yongjun,&Liu, Chengbu.(2013).Theoretical studies on the common catalytic mechanism of transketolase by using simplified models.JOURNAL OF MOLECULAR GRAPHICS & MODELLING. |
MLA | Sheng, Xiang,et al."Theoretical studies on the common catalytic mechanism of transketolase by using simplified models".JOURNAL OF MOLECULAR GRAPHICS & MODELLING (2013). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论