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通过无意义介导的mRNA衰变因子UPF2进行动态RNA结合和展开

Jenn-Yeu Alvin Szeto¹, Mirella Vivoli Vega¹, Justine Mailliot¹

¹University of Bristol, School of Biochemistry.

RNA (New York, N.Y.)

|April 17, 2025

概括

无意中介衰变 (NMD) 因素UPF2结合和稳定单链RNA,影响基因表达. 这种RNA结合活性可能支持在NMD通路调节中的UPF1酶功能.

科学领域:

分子生物学分子生物学
基因规则基因规则
RNA监控监控检测检测

背景情况:

无意中介的mRNA衰变 (NMD) 是通过降解异常mRNA来调节基因表达的关键途径.
核心NMD因子UPF1,UPF2和UPF3B对于识别和降解具有过早停止编码子的mRNA至关重要.
虽然UPF2与UPF1和UPF3B的相互作用是已知的,但其与RNA的直接关联是鲜为人知的.

研究的目的:

研究NMD因子UPF2.2的RNA结合特性和功能.
描述UPF2在核酸相互作用中所涉及的特定领域和活动.
阐明UPF2的RNA结合如何对整体NMD机制作出贡献.

主要方法:

使用生化分析分析核酸结合的分析.
在UPF2.2中识别RNA/DNA结合模块.
描述UPF2的RNA回火和展开活动.
在单链RNA (ss-RNA) 结合时评估UPF2的构造变化.

主要成果:

UPF2的第一个和第三个MIF4G域被确定为主要的RNA/DNA结合模块.
UPF2的MIF4G域-3表现出RNA回火活性,全长的UPF2可以展开毛RNA结构.
UPF2以序列独立的方式优先结合和稳定ss-RNA,诱导构造变化.
UPF2的RNA结合和展开活动与其动态结构性质有关.

结论:

UPF2直接与RNA结构相互作用和调节,特别是ss-RNA.
这些PPF2的RNA结合和展开活动可能有助于PPF1的酶和mRNP重塑功能.
UPF2的RNA相互作用,与UPF3B结合,可以稳定UPF1与目标无意义mRNA的关联,促进NMD.

关键词:

动态RNA-UPF蛋白质复合体胡说八道介导的mRNA衰变 RNA 展开 RNA 展开向上框架移动蛋白 2 2 上框架移动蛋白

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