CAJ | 학술논문

细菌化学趋向性受体的最小结构单元为二聚体，在细胞膜上这些二聚体会聚集成大团簇.X射线晶体结构和低分辨电镜结构测定表明，这些团簇有两类不同的形式，一种是在晶体结构中观察到的倒金字塔式二聚体的三聚体重复形成的聚集，另一种为由二聚体尾部相互盘绕形成的拉链状聚集.有关拉链状聚集的详细分子模型目前尚不清楚.本文使用蛋白质-蛋白质对接的方法研究了大肠杆菌丝氨酸化学趋向性受体Tsr二聚体之间的相互作用.分子对接计算表明，倒金字塔式聚集和拉链状聚集的基本复合物都是可以出现的，相应复合物的分子动力学模拟表明这些结构都具有一定的稳定性.对于所获得的拉链状聚集体的基本复合物结构模型进行了详细的二聚体作用界面分析，发现二聚体间主要通过静电和疏水作用形成复合物，其中Arg388、Phe373和Ile377是形成拉链状聚集的关键作用残基.所建立的Tsr拉链状聚集的结构模型有助于揭示细菌化学趋向性受体在细胞膜上聚集的分子机制，为进一步的聚集理论及模拟研究提供了基础.
세균화학추향성수체적최소결구단원위이취체，재세포막상저사이취체회취집성대단족.X사선정체결구화저분변전경결구측정표명，저사단족유량류불동적형식，일충시재정체결구중관찰도적도금자탑식이취체적삼취체중복형성적취집，령일충위유이취체미부상호반요형성적랍련상취집.유관랍련상취집적상세분자모형목전상불청초.본문사용단백질-단백질대접적방법연구료대장간균사안산화학추향성수체Tsr이취체지간적상호작용.분자대접계산표명，도금자탑식취집화랍련상취집적기본복합물도시가이출현적，상응복합물적분자동역학모의표명저사결구도구유일정적은정성.대우소획득적랍련상취집체적기본복합물결구모형진행료상세적이취체작용계면분석，발현이취체간주요통과정전화소수작용형성복합물，기중Arg388、Phe373화Ile377시형성랍련상취집적관건작용잔기.소건립적Tsr랍련상취집적결구모형유조우게시세균화학추향성수체재세포막상취집적분자궤제，위진일보적취집이론급모의연구제공료기출.
Bacterial chemoreceptors form homodimers that assemble into large clusters on cellmembranes to respond to external signals. These clusters have been found to have two different types of patterns:one is composed of inverted pyramid like trimers-of-dimers observed in the X-ray crystal structures, and the other is formed by the zipper like overlap of tips of dimers, as revealed by low-resolution electron microscopy. The detailed molecular model of the zipper like assemblies has remained unknown until now. Using protein-protein docking method, we studied the interactions between serine chemoreceptor Tsr dimers in Escherichia coli. The basic complexes for the two types of clustering patterns were both found in the docking complexes. Molecular dynamics simulations confirmed that these complexes were stable to a certain extent. Protein-protein interface analysis indicated that electrostatic and hydrophobic interactions are the dominant driving forces for zipper like complex formation. Arg388, Phe373, and Ile377 are the key interfacial residues that stabilize the zipper like complexes. The molecular models for the zipper like complexes provide insight into the mechanisms of bacterial chemoreceptor assemblies on membranes and serve as a basis for further theoretical and simulation studies.