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对小RNA伪化量的定量分析揭示了PUS酶在tRNA anticodon干循环中的相互作用

Wenqing Liu¹, Yichen Ma¹, Liping Wang²

¹Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China.

Nature communications

|February 16, 2026

概括

伪尤里丁 (Ψ) 是一个关键的RNA修饰. 这项研究揭示了新的人类伪尿素合成酶 (PUS) 和它们的相互作用,揭示了各种小RNA中 Ψ 形成的复杂调节.

科学领域:

生物化学生物化学
分子生物学分子生物学
在RNA生物学,RNA生物学.

背景情况:

伪尤里丁 (Ψ) 是最丰富的RNA修饰物.
多个伪尿素合成酶 (PUSs) 催化 Ψ 的形成.
人类PUS的基质特异性和相互作用尚未完全理解.

研究的目的:

通过使用定量方法,对各种小RNA进行伪氨基化分析.
为了确定新的PUS基质,并描述PUS酶活动.
研究 Ψ 形成中的不同 PUS 酶之间的相互作用.

主要方法:

使用了PRAISE,一种定量伪尿素检测方法.
在细胞质和线粒体tRNA,snRNA和snoRNA中分析了伪化.
描述了RluA家族酶 (RPUSD1,RPUSD2,RPUSD3) 的活性.

主要成果:

发现了PUS7作为一个snoRNA伪化酶,与DKC1.1一起.
在tRNA伪uridylation中确定了PUS1,RPUSD1和PUS7之间的相互作用.
RPUSD1和RPUSD2表现出特定的tRNA伪化活动,而RPUSD3缺乏tRNA活动.

结论:

定量 Ψ 分析提供了对 PUS 基质特异性的洞察力.
在 Ψ 形成过程中揭示了 PUS 酶之间未知的相互作用.
描述了tRNA和snoRNA上的特定PUS活动,进步了对RNA修饰调节的理解.

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