Structure and conformational dynamics of Clostridioides difficile toxin A.

Structure and conformational dynamics of Clostridioides difficile toxin A.
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DOI:
10.26508/lsa.202201383
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发表时间:
2022-06
影响因子:
4.4
通讯作者:
Jin R
Jin R
中科院分区:
生物学2区
文献类型:
--
作者:
Chen B;Basak S;Chen P;Zhang C;Perry K;Tian S;Yu C;Dong M;Huang L;Bowen ME;Jin R

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本研究提出了一个完整的TcdA全毒素的结构模型,并为TcdA的构象动力学及其在TcdA中毒中的作用提供了新的思路。艰难梭菌毒素A和B(TcdA和TcdB)是引起艰难梭菌相关疾病的两种主要毒力因子。艰难梭菌感染(CDI)。在这里,我们报告的TcdA片段(残基L 843-T2481),这推进了我们的理解TcdA全毒素的完整结构的3.18-kDa分辨率的晶体结构。我们的结构分析,再加上互补的单分子FRET和有限的蛋白水解研究,揭示了TcdA采用动态结构,其CROPs结构域可以采样的开放和封闭的构象在一个pH值依赖的方式频谱。此外,一个小的球状子域(SGS)和CROPs保护TcdA的孔形成区域在封闭状态下在中性pH值,这可能有助于调节pH值依赖性的孔形成的TcdA。一个合理设计的TcdA突变,捕获的CROPs在封闭的构象显示出显着降低的细胞毒性。两者合计,这些研究揭示了新的光TcdA的构象动力学及其在TcdA中毒的作用。
This study presents a complete structural model of TcdA holotoxin and sheds new lights into the conformational dynamics of TcdA and its roles in TcdA intoxication. Clostridioides difficile toxin A and B (TcdA and TcdB) are two major virulence factors responsible for diseases associated with C. difficile infection (CDI). Here, we report the 3.18-Å resolution crystal structure of a TcdA fragment (residues L843–T2481), which advances our understanding of the complete structure of TcdA holotoxin. Our structural analysis, together with complementary single molecule FRET and limited proteolysis studies, reveal that TcdA adopts a dynamic structure and its CROPs domain can sample a spectrum of open and closed conformations in a pH-dependent manner. Furthermore, a small globular subdomain (SGS) and the CROPs protect the pore-forming region of TcdA in the closed state at neutral pH, which could contribute to modulating the pH-dependent pore formation of TcdA. A rationally designed TcdA mutation that trapped the CROPs in the closed conformation showed drastically reduced cytotoxicity. Taken together, these studies shed new lights into the conformational dynamics of TcdA and its roles in TcdA intoxication.
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期刊: Acta crystallographica. Section D, Biological crystallography
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