在没有序列保存的情况下,由内在无序区域保存的分子识别
bioRxiv : the preprint server for biology
|August 23, 2023
概括
冠状病毒核体蛋白中的内在无序区域 (IDR) 编码序列特定的RNA结合. 尽管有很高的序列变异性,但这些无序的区域保持功能,并形成保存的蛋白质-RNA复合体.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 病毒学 病毒学
背景情况:
- 内在无序区域 (IDR) 对于细胞功能至关重要,但往往缺乏明显的序列保护.
- 了解如何在IDR中保持功能,尽管序列变化是一个关键的挑战.
研究的目的:
- 为了研究冠状病毒核囊蛋白的内在无序区域中的RNA结合特异性.
- 探索IDRs中的序列变化如何影响邻近折叠域的分子识别.
主要方法:
- 使用粗粒度的分子动力学模拟.
- 模拟了冠状病毒核体蛋白的N终端域 (NTD) 和RNA结合域 (RBD).
主要成果:
- 尽管NTD的序列变异性很高,但在RNA结合中表现出令人惊的序列特异性.
- NTD序列组成和顺序显著影响RNA结合亲和力,增强或抑制它.
- 一个保存的,形状稳定的RNA:蛋白质复合结构在具有不同NTD序列的ortologs中持续存在.
结论:
- 无序的区域可以编码特定的功能,并保持它们通过进化尽管序列分歧.
- IDRs和折叠域之间的相互作用对于病毒蛋白的功能性保存至关重要.
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