Molecular Docking Identifies the Binding Sites of the Ligands Specifically to TCPTP
首发时间:2012-04-25
Abstract:We have studied on T-cell protein-tyrosine phosphatase (TCPTP) as a model phosphatase in an attempt to seek the most favorable binding sites of TCPTP interacting with ligands and find out differences in substrate recognition by protein tyrosine phosphatase 1B (PTP1B) and TCPTP. The xalylarylaminobenzoic acids derivatives and 1,2,3,4-Tetrahydroisoquino- linyl (TIQ) sulfamic acid derivative were selected in this study. To better understand the structural and chemical features responsible for the recognition mechanism, the Autodock 4.0 was performed as automated molecular docking program to explore the binding pocket sites of this enzyme. Two key sites (Ⅰand Ⅲ) were found of the TCPTP contributing towards the binding of these compounds. SiteⅠ residues involved in forming two important hydrogen bonds from the enzyme were: Gln260 and Arg222. We also found that site Ⅲ consists of two main residues: Tyr22 and Pro262, which involved in hydrophobic interactions with the ligands. And the results of molecular docking showed that residue Asp48 played an important role in substrate binding. The interaction model of TCPTP inhibitors was similar and the difference in biologic activities of these inhibitors can be well explained. This study will help in the rational design of potent and selective PTP1B inhibitors over TCPTP.
keywords: TCPTP PTP1B molecular docking binding site
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分子对接确定TCPTP与配体的结合位点
摘要:本文以T细胞蛋白酪氨酸磷酸酶(TCPTP)作为研究模型,寻找配体与TCPTP最佳的结合方式以寻找与蛋白酪氨酸磷酸酶1B(PTP1B)的区别。在这里选择芳氨基苯甲酸类衍生物和1,2,3,4 - 四氢异喹啉(TIQ)氨基磺酸衍生物为小分子化合物,为了更好地了解识别机制的结构和化学特性,在此采用Autodock4.0自动化分子对接程序去探索酶的结合位点。结果发现了小分子化合物与TCPTP结合的两个关键位点(位点I和 III)。位点I包括形成重要氢键的两个残基:Gln260 and Arg222。同时还发现位点III 包含两个主要的残基Tyr22 和 Pro262, 主要与化合物产生输水作用。对接发现残基Asp48对于TCPTP和PTP1B活性起到很重要的作用。TCPTP抑制剂的作用模式是相似的,并且能够很好地解释这些抑制剂的生物活性的差异。此研究对于设计高效有选择性的并且能够区别于TCPTP的PTP1B抑制剂有一定的帮助。
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