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在PAM识别中的灵活性扩大了xCas9中的DNA向

Kazi A Hossain^1,2, Lukasz Nierzwicki¹, Modesto Orozco^3,4

¹Department of Bioengineering, University of California Riverside, 900 University Avenue, Riverside, CA 52512, United States.

bioRxiv : the preprint server for biology

|January 13, 2025

概括

xCas9基因编辑工具通过改变其PAM识别机制来扩大DNA向. 这包括在关键蛋白相互作用中引入灵活性,增强特异性和扩大CRISPR-Cas系统能力.

科学领域:

分子生物学分子生物学
遗传学是一个遗传学.
生物化学生物化学

背景情况:

CRISPR-Cas9是一种强大的基因组编辑工具.
非目标突变限制了CRISPR-Cas9的临床应用.
xCas9是一个工程变体,旨在增强特异性.

研究的目的:

为了阐明xCas9扩展Protospacer相邻动机 (PAM) 识别背后的分子机制.
了解xCas9如何实现比野生类型Cas9.9更广泛的DNA向.
为设计未来的CRISPR-Cas系统提供洞察力,以扩展准能力.

主要方法:

对xCas9和野生类型Cas9 PAM识别的比较分析.
研究蛋白质-DNA相互作用的结构和生化研究.
在xCas9发育过程中对PAM序列选择的进化分析.

主要成果:

野生类型Cas9的严格的瓜宁选择是由于刚性氨酸二.
通过xCas9的R1335灵活性,可以识别其他PAM序列.
这种灵活性赋予了的偏好,改善了正规的TGG PAM识别.
xCas9最初倾向于替代PAM,然后在进化过程中转向正规PAM.

结论:

在xCas9的扩展PAM识别中介于其PAM交互裂的灵活性增加.
微调裂灵活性是扩大CRISPR-CasDNA向的一个关键策略.
了解xCas9的机制为其他CRISPR-Cas系统提供了可用的见解.

关键词:

这就是CRISPR-Cas9的特征.这是一个RNARNARNARNARNA.进入的过程中,基因组编辑基因组编辑蛋白质动力学蛋白质动力学蛋白质-DNA-DNA 的关系.

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