多巴胺第三受体蛋白三维结构及其活性位点氨基酸残基

引用本文: 金毅, 王悦, 卞富永, 史强, 葛茂发, 王树, 张兴康, 徐四川. 多巴胺第三受体蛋白三维结构及其活性位点氨基酸残基[J]. 物理化学学报, 2011, 27(10): 2432-2446. doi: 10.3866/PKU.WHXB20111001 shu

Citation: JIN Yi, WANG Yue, BIAN Fu-Yong, SHI Qiang, GE Mao-Fa, WANG Shu, ZHANG Xing-Kang, XU Si-Chuan. Three-Dimensional Structure of Dopamine 3-Subtype Receptor with the Active Site Residues for the Binding of Dopamine[J]. Acta Physico-Chimica Sinica, 2011, 27(10): 2432-2446. doi: 10.3866/PKU.WHXB20111001 shu

多巴胺第三受体蛋白三维结构及其活性位点氨基酸残基

金毅 ^1, ,
王悦 ^1, ,
卞富永 ^1, ,
史强 ^2, ,
葛茂发 ^2, ,
王树 ^3, ,
张兴康 ^2, ,
徐四川 ^1,2,

基金项目:
中国科学院百人计划, 云南省人才基金(2006PY01-29) (2006PY01-29)

国家自然科学基金(21163024)资助项目 (21163024)

摘要: 基于牛视紫红质模板蛋白, 同源模建多巴胺第三受体(D₃R)蛋白三维结构, 在1-棕榈酰-2-油酰-卵磷脂(POPC)膜-水模型环境, 开展300 ns 分子动力学模拟提炼优化其结构, 取得稳定的D₃R 蛋白三维结构(2B08-D₃R). 在该蛋白基础上, 采用MP2/6-31G(d,p)方法, 计算多巴胺(Dop)与氨基酸残基相互作用的结合能,确定五个残基(Asp117、Ser208、His272、Phe269和Thr276)为活性位点. 五个活性位点残基分别位于D₃R蛋白跨膜螺旋区TM3、TM5和TM6, 组成活性空腔结构. 多巴胺分子以其苯基平面与TM2-TM7包围的圆柱体空腔平行和非共价键结合方式保留在D₃R蛋白中, 与D₃R蛋白结合能E_b为-97.8 kJ·mol^-1. 基于3PBL D₃R突变体晶体结构, 构建了另外一个含有多巴胺分子的D₃R蛋白结构(Dop-3PBL-D₃R), 确定在该蛋白结构中, 多巴胺的活性位点氨基酸是Asp83、His272、Phe269、Phe268和Trp265. 在该蛋白结构中, 多巴胺分子同样以其苯基平面与TM2-TM7包围的圆柱体空腔平行和非共价键方式结合, 与该蛋白相互作用的结合能是-80.5 kJ·mol^-1.

关键词:

English

Three-Dimensional Structure of Dopamine 3-Subtype Receptor with the Active Site Residues for the Binding of Dopamine

1.
1. Key Laboratory of Education Ministry for Medicinal Chemistry of Natural Resource, College of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China;
2. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China;
3. CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
Received Date: 26 May 2011
Available Online: 27 September 2011
Fund Project:
中国科学院百人计划, 云南省人才基金(2006PY01-29)

国家自然科学基金(21163024)资助项目

Abstract: The dopamine 3-subtype receptor (D₃R) is a promising therapeutic target for the development of new drugs. Using rhodopsin as a template protein, we report homology modeling of a complete D₃R structure including dopamine (Dop) in an environment of a 1-palmitoyl-2-oleoylsn-glycero-3-phospha-tidylcholine (POPC) explicit lipid bilayer and water. A 300 ns molecular dynamics (MD) simulation was performed to obtain a stable three-dimensional structure for D₃R (2B08-D₃R) based on five residues (Asp117, His272, Phe269, Ser208, and Thr276), and these were validated as active sites for the binding of dopamine to the D₃R protein by the binding energies (E_b) calculated using MP2/6-31G(d,p) between Dop and each of the residues within 0.6 nm of Dop. The five key residues are locating on TM3, TM5, and TM6 within the D₃R helical regions, respectively, forming an active pocket for the binding of Dop to the D₃R protein. The phenyl plane of Dop is parallel to the cylinder space formed by the TM2-TM7 helical regions when it bonds non-covalently to the D₃R protein. The value of E_b between the Dop and D₃R protein is -97.8 kJ·mol^-1, which explains why dopamine is easily assimilated into the D₃R protein and departs from it as a nerve material and a signal transducer. Using the crystal protein structure of mutated D₃R (code: 3PBL) we built another D₃R protein structure including dopamine (designated Dop-3PBL-D₃R) and identified five residues (Asp83, His272, Phe269, Phe268, and Trp265) as the active sites for the binding of Dop. The phenyl plane of Dop is also parallel to the cylinder space that is formed by the TM2-TM7 helical regions when it binds non-covalently to the Dop-3PBL-D₃R protein with an E_b of -80.5 kJ·mol^-1 between them.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

多巴胺第三受体蛋白三维结构及其活性位点氨基酸残基

English

Three-Dimensional Structure of Dopamine 3-Subtype Receptor with the Active Site Residues for the Binding of Dopamine

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

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CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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中国化学会秘书处

多巴胺第三受体蛋白三维结构及其活性位点氨基酸残基

English

Three-Dimensional Structure of Dopamine 3-Subtype Receptor with the Active Site Residues for the Binding of Dopamine

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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