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通过SARS-CoV-2 NiRAN域对GTP介导的RNA限制的机制仍未解决

Gabriel I Small¹, Seth A Darst², Elizabeth A Campbell³

¹Laboratory of Molecular Pathogenesis, the Rockefeller University, 1230 York Avenue, New York, NY 10065, USA; Laboratory of Molecular Biophysics, the Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.

|June 26, 2025

概括

SARS-CoV-2 的 NiRAN 域启动了 mRNA 封闭. 克里奥电磁数据分析对之前关于GTP介导的上限机制的说法提出了质疑,表明它仍然未解决.

科学领域:

生物化学
病毒学
结构生物学

背景情况:

尼多病毒RdRp相关核转移酶 (NiRAN) 域对于启动冠状病毒mRNA封闭至关重要.
这一过程涉及GDP多核酸转移酶反应,将RNA与nsp9连接起来.
虽然GDP是首选的基层,但NiRAN域也可以使用GTP进行上限,尽管这一机制尚未完全理解.

研究的目的:

通过SARS-CoV-2 NiRAN域对GTP介导的RNA封闭提出的反应机制进行批判性评估.
重新检查和同事提出的冷电子显微镜 (cryo-EM) 数据和原子模型 (PDB: 8GWE).

主要方法:

低温电子显微镜 (cryo-EM) 数据的分析.
对原子模型 (PDB: 8GWE) 的化学可信性进行评估.
对支持拟议机制的实验证据的审查.

主要成果:

支持PDB: 8GWE的冷EM数据没有证实GTP类似物 (GMPPNP) 在NiRAN活性部位的存在.
从这些数据中得出的原子模型与基本的化学原理不一致.
延等人提出的实验证据. 不支持他们提出的机制.

结论:

关于GTP介导的RNA封闭机制的Yan及其同事得出的结论没有实验支持.
SARS-CoV-2 NiRAN 域使用 GTP 进行 RNA 封闭的确切机制仍未确定.
这项研究强调了结构生物学和机理学研究中严格数据验证的重要性.

关键词:

NiRAN域名冠状病毒冠状病毒化电磁场脱RNA化 mRNA上限的使用没有.没有.

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