Structural Characterization of Competence-Stimulating Peptide Analogues Reveals Key Features for ComD1 and ComD2 Receptor Binding in Streptococcus pneumoniae.

Structural Characterization of Competence-Stimulating Peptide Analogues Reveals Key Features for ComD1 and ComD2 Receptor Binding in Streptococcus pneumoniae.
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DOI:
10.1021/acs.biochem.8b00653
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发表时间:
2018-09-11
期刊:
影响因子:
2.9
通讯作者:
Tal-Gan Y
Tal-Gan Y
中科院分区:
生物学3区
文献类型:
--
作者:
Yang Y;Cornilescu G;Tal-Gan Y

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肺炎链球菌是一种重要的病原体,它利用群体感应(QS)来调节遗传转化、毒力和生物膜形成。能力刺激肽 (CSP) 是一种 17 个氨基酸的信号肽,肺炎链球菌利用它来触发 QS。根据肺炎链球菌产生的 CSP 信号(CSP1 或 CSP2)及其相容受体(分别为 ComD1 或 ComD2),肺炎链球菌菌株可分为两个主要特异性组。通过使用合成的 CSP 类似物靶向 CSP:ComD 相互作用,可以实现肺炎链球菌 QS 的调节。然而,为了合理设计基于 CSP 的具有增强活性的 QS 调节剂,需要深入了解受体结合所需的结构特征。在此,我们使用 NMR 光谱法报告了具有不同生物活性的八种 CSP1 和 CSP2 类似物的全面溶液内三维结构表征。对这些结构的分析揭示了有效结合 ComD1 和 ComD2 所需的两个不同的疏水斑块。
Streptococcus pneumoniae is an important pathogen that utilizes quorum sensing (QS) to regulate genetic transformation, virulence and biofilm formation. The competence stimulating peptide (CSP) is a 17-amino acid signal peptide that is used by S. pneumoniae to trigger QS. S. pneumoniae strains can be divided into two main specificity groups based on the CSP signal they produce (CSP1 or CSP2) and their compatible receptors (ComD1 or ComD2 respectively). Modulation of QS in S. pneumoniae can be achieved by targeting the CSP:ComD interaction using synthetic CSP analogues. However, in order to rationally design CSP-based QS modulators with enhanced activities, an in-depth understanding of the structural features that are required for receptor binding is needed. Herein, we report a comprehensive in-solution three-dimensional structural characterization of eight CSP1 and CSP2 analogues with varied biological activities using NMR spectroscopy. Analysis of these structures revealed two distinct hydrophobic patches required for effective ComD1 and ComD2 binding.
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