arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.1248q-bio.BMcond-mat.stat-mechq-bio.QM
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蛋白质相互作用中直接残基接触的信息传递识别

Identification of direct residue contacts in protein-protein interaction by message passing

M. Weigt, R. A. White, H. Szurmant, J. A. Hoch, T. Hwa

摘要:

理解蛋白质相互作用中特异性的分子决定因素是后基因组生物学的一个突出挑战。从数百种细菌基因组序列生成的大型蛋白质数据库的可用性使得可以采用各种统计方法来解决这个问题。在这种情况下,基于协方差的方法已被用来确定相互作用的蛋白质中的氨基酸位置之间的相关性。然而,这些方法具有重要的缺点,因为它们不能区分直接和间接相关的残基。我们开发了一种方法,将协方差分析与全局推理分析相结合,采用统计物理学中的方法。应用于一组> 2,500个细菌双组分信号转导系统的代表,协方差与全局推断的组合成功且稳健地识别了空间上接近的残基对,而无需求助于特设调谐参数,无论是传感器激酶(SK)和响应调节因子(RR)蛋白之间的异源相互作用还是RR蛋白之间的同源相互作用。这种方法的巨大成功说明了全局推理方法在仅基于序列信息识别直接相互作用方面的有效性。我们预计这种方法将很快适用于蛋白质之间的相互作用表面存在于每个基因组只有1个拷贝的测序基因组的数量继续扩大。该方法的应用可显著增加潜在的治疗干预靶点,为阐明蛋白质相互作用的机制奠定基础,为准确预测相互作用蛋白质伴侣奠定基础。

英文摘要:

Understanding the molecular determinants of specificity in protein-protein interaction is an outstanding challenge of postgenome biology. The availability of large protein databases generated from sequences of hundreds of bacterial genomes enables various statistical approaches to this problem. In this context covariance-based methods have been used to identify correlation between amino acid positions in interacting proteins. However, these methods have an important shortcoming, in that they cannot distinguish between directly and indirectly correlated residues. We developed a method that combines covariance analysis with global inference analysis, adopted from use in statistical physics. Applied to a set of >2,500 representatives of the bacterial two-component signal transduction system, the combination of covariance with global inference successfully and robustly identified residue pairs that are proximal in space without resorting to ad hoc tuning parameters, both for heterointeractions between sensor kinase (SK) and response regulator (RR) proteins and for homointeractions between RR proteins. The spectacular success of this approach illustrates the effectiveness of the global inference approach in identifying direct interaction based on sequence information alone. We expect this method to be applicable soon to interaction surfaces between proteins present in only 1 copy per genome as the number of sequenced genomes continues to expand. Use of this method could significantly increase the potential targets for therapeutic intervention, shed light on the mechanism of protein-protein interaction, and establish the foundation for the accurate prediction of interacting protein partners.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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