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Theoretical Study of the Catalytic Mechanism of E1 Subunit of Pyruvate Dehydrogenase Multienzyme Complex from Bacillus stearothermophilus
Sheng, Xiang1; Liu, Yongjun1,2; Liu, YJ (reprint author), Shandong Univ, Sch Chem & Chem Engn, Key Lab Theoret & Computat Chem, Jinan 250100, Shandong, Peoples R China.
2013-11-12
发表期刊BIOCHEMISTRY
ISSN0006-2960
卷号52期号:45页码:8079-8093
文章类型Article
摘要Pyruvate dehydrogenase multienzyme complex (PDHc) is a member of a family of 2-oxo acid dehydrogenase (OADH) multienzyme complexes involved in several central points of oxidative metabolism, and the E1 subunit is the most important component in the entire PDHc catalytic system, which catalyzes the reversible transfer of an acetyl group from a pyruvate to the lipoyl group of E2 subunit lipoly domain. In this article, the catalytic mechanism of the E1 subunit has been systematically studied using density functional theory (DFT). Four possible pathways with different general acid/base catalysts in decarboxylation and reductive acylation processes were explored. Our calculation results indicate that the 4'-amino pyrimidine of ThDP and residue His128 are the most likely proton donors in the decarboxylation and reductive acylation processes, respectively. During the reaction, each C-C and C-S bond formation or cleavage process, except for the liberation of CO2, is always accompanied by a proton transfer between the substrates and proton donors. The liberation of CO2 is calculated to be the rate-limiting step for the overall reaction, with an energy barrier of 13.57 kcal/mol. The decarboxylation process is endothermic by 5.32 kcal/mol, whereas the reductive acylation process is exothermic with a value of 5.74 kcal/mol. The assignment of protonation states of the surrounding residues can greatly influence the reaction. Residues His128 and His271 play roles in positioning the first substrate pyruvate and second substrate lipoyl group, respectively.; Pyruvate dehydrogenase multienzyme complex (PDHc) is a member of a family of 2-oxo acid dehydrogenase (OADH) multienzyme complexes involved in several central points of oxidative metabolism, and the E1 subunit is the most important component in the entire PDHc catalytic system, which catalyzes the reversible transfer of an acetyl group from a pyruvate to the lipoyl group of E2 subunit lipoly domain. In this article, the catalytic mechanism of the E1 subunit has been systematically studied using density functional theory (DFT). Four possible pathways with different general acid/base catalysts in decarboxylation and reductive acylation processes were explored. Our calculation results indicate that the 4'-amino pyrimidine of ThDP and residue His128 are the most likely proton donors in the decarboxylation and reductive acylation processes, respectively. During the reaction, each C-C and C-S bond formation or cleavage process, except for the liberation of CO2, is always accompanied by a proton transfer between the substrates and proton donors. The liberation of CO2 is calculated to be the rate-limiting step for the overall reaction, with an energy barrier of 13.57 kcal/mol. The decarboxylation process is endothermic by 5.32 kcal/mol, whereas the reductive acylation process is exothermic with a value of 5.74 kcal/mol. The assignment of protonation states of the surrounding residues can greatly influence the reaction. Residues His128 and His271 play roles in positioning the first substrate pyruvate and second substrate lipoyl group, respectively.
WOS标题词Science & Technology ; Life Sciences & Biomedicine
DOI10.1021/bi400577f
关键词[WOS]THIAMIN DIPHOSPHATE ; ESCHERICHIA-COLI ; ACTIVE-SITES ; ACETOHYDROXYACID SYNTHASE ; PSEUDOMONAS-AERUGINOSA ; LIPOYL DOMAIN ; ENZYMES ; DEFICIENCY ; COMPONENT ; TRANSKETOLASE
收录类别SCI
语种英语
项目资助者Natural Science Foundation of China(21373125 ; 21173129)
WOS研究方向Biochemistry & Molecular Biology
WOS类目Biochemistry & Molecular Biology
WOS记录号WOS:000330017700020
引用统计
被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/3899
专题中国科学院西北高原生物研究所
通讯作者Liu, YJ (reprint author), Shandong Univ, Sch Chem & Chem Engn, Key Lab Theoret & Computat Chem, Jinan 250100, Shandong, Peoples R China.
作者单位1.Shandong Univ, Sch Chem & Chem Engn, Key Lab Theoret & Computat Chem, Jinan 250100, Shandong, Peoples R China
2.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China
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GB/T 7714
Sheng, Xiang,Liu, Yongjun,Liu, YJ . Theoretical Study of the Catalytic Mechanism of E1 Subunit of Pyruvate Dehydrogenase Multienzyme Complex from Bacillus stearothermophilus[J]. BIOCHEMISTRY,2013,52(45):8079-8093.
APA Sheng, Xiang,Liu, Yongjun,&Liu, YJ .(2013).Theoretical Study of the Catalytic Mechanism of E1 Subunit of Pyruvate Dehydrogenase Multienzyme Complex from Bacillus stearothermophilus.BIOCHEMISTRY,52(45),8079-8093.
MLA Sheng, Xiang,et al."Theoretical Study of the Catalytic Mechanism of E1 Subunit of Pyruvate Dehydrogenase Multienzyme Complex from Bacillus stearothermophilus".BIOCHEMISTRY 52.45(2013):8079-8093.
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