Theoretical study on the deglycosylation mechanism of rice BGlu1 beta-glucosidase
文献类型：期刊论文
| 作者 | Wang, Jinhu1; Hou, Qianqian1; Sheng, Xiang1; Gao, Jun1; Liu, Yongjun1,2; Liu, Chengbu1 |
| 刊名 | international journal of quantum chemistry
 |
| 出版日期 | 2013-04-15 |
| 卷号 | 113期号:8页码:1071-1075 |
| 关键词 | QM MM deglycosylation -glucosidases laminaribiose reaction mechanism |
| ISSN号 | 0020-7608 |
| 通讯作者 | wang, jh (reprint author), shandong univ, sch chem & chem engn, minist educ, key lab colloid & interface chem, jinan 250100, shandong, peoples r china. |
| 中文摘要 | it is proposed that the catalysis of gh1 enzymes follows a double-displacement mechanism involving a glycosylation and a deglycosylation steps. in this article, the deglycosylation step was studied using quantum mechanical/molecular mechanical (qm/mm) approach. the calculation results reveal that the nucleophilic water (wat1) attacks to the anomeric c1, and the deglycosylation step experiences a barrier of 21.4 kcal/mol from the glycosyl-enzyme intermediate to the hydrolysis product, in which an oxocarbenium cation-like transition state (ts) is formed. at the ts, the covalent glycosyl-enzyme bond is almost broken (distance of 2.45 angstrom), and the new covalent bond between the attacking oxygen of the water molecule and c1 is basically established (length of 2.14 angstrom). in addition, a short hydrogen bridge is observed between the nucleophilic e386 and the c2oh of sugar ring (distance of 1.94 angstrom) at the ts, which facilitates the ring changing from a chair form to half-chair form, and stabilizes the oxocarbenium cation-like ts. (c) 2013 wiley periodicals, inc. |
| 英文摘要 | it is proposed that the catalysis of gh1 enzymes follows a double-displacement mechanism involving a glycosylation and a deglycosylation steps. in this article, the deglycosylation step was studied using quantum mechanical/molecular mechanical (qm/mm) approach. the calculation results reveal that the nucleophilic water (wat1) attacks to the anomeric c1, and the deglycosylation step experiences a barrier of 21.4 kcal/mol from the glycosyl-enzyme intermediate to the hydrolysis product, in which an oxocarbenium cation-like transition state (ts) is formed. at the ts, the covalent glycosyl-enzyme bond is almost broken (distance of 2.45 angstrom), and the new covalent bond between the attacking oxygen of the water molecule and c1 is basically established (length of 2.14 angstrom). in addition, a short hydrogen bridge is observed between the nucleophilic e386 and the c2oh of sugar ring (distance of 1.94 angstrom) at the ts, which facilitates the ring changing from a chair form to half-chair form, and stabilizes the oxocarbenium cation-like ts. (c) 2013 wiley periodicals, inc. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | chemistry, physical ; mathematics, interdisciplinary applications ; physics, atomic, molecular & chemical |
| 研究领域[WOS] | chemistry ; mathematics ; physics |
| 关键词[WOS] | crystal-structure ; molecular-dynamics ; substrate-specificity ; aglycone specificity ; catalytic mechanism ; zeolite structure ; qm/mm ; glycosidase ; insights ; maize |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000315957500003 |
| 公开日期 | 2014-05-09 |
| 源URL | [http://ir.nwipb.ac.cn/handle/363003/3949]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 作者单位 | 1.Shandong Univ, Sch Chem & Chem Engn, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China 2.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Jinhu,Hou, Qianqian,Sheng, Xiang,et al. Theoretical study on the deglycosylation mechanism of rice BGlu1 beta-glucosidase[J]. international journal of quantum chemistry,2013,113(8):1071-1075. |
| APA | Wang, Jinhu,Hou, Qianqian,Sheng, Xiang,Gao, Jun,Liu, Yongjun,&Liu, Chengbu.(2013).Theoretical study on the deglycosylation mechanism of rice BGlu1 beta-glucosidase.international journal of quantum chemistry,113(8),1071-1075. |
| MLA | Wang, Jinhu,et al."Theoretical study on the deglycosylation mechanism of rice BGlu1 beta-glucosidase".international journal of quantum chemistry 113.8(2013):1071-1075. |
入库方式： OAI收割
来源：西北高原生物研究所
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