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Updated: Sep 17, 2025
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An Assay for Quantifying Protein-RNA Binding in Bacteria
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通过细菌最小RNase P处理转移RNA的结构基础
Takamasa Teramoto1, Takeshi Koyasu2, Takashi Yokogawa3,4,5
1Laboratory of Biophysical Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan. teramotot@agr.kyushu-u.ac.jp.
Nature communications
|July 2, 2025
概括
最小的蛋白质RNase P酶,HARP,形成十二体到成熟的前体tRNA (tRNA前体). 这种寡合化使HARP能够处理5'-leader和3'-trailer序列,揭示了进化适应.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 前体tRNAs (pre-tRNAs) 需要精确处理5 - 领导者和3 - 拖车序列的成熟和功能.
- 负责5导体去除的RNase P酶存在各种形式,包括某些细菌和古生物中发现的HARP等仅含蛋白质的酶.
- 哈普酶形成十二体酶,具有多个活性位点,表明复杂的催化机制.
研究的目的:
- 阐明在tRNA成熟前的HARP十二体体的结构和功能.
- 研究HARP识别和分裂tRNA前基质的机制.
- 了解小蛋白通过寡合化对新型酶功能的进化适应.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定与前tRNAs结合的HARP十二角体的结构.
- 生物化学测试以描述HARP的裂变活动.
- 结构分析以确定基质识别机制.
主要成果:
- 冷-EM结构显示了HARP十二体体复合体与五个不同的前tRNAs.
- 哈普利用其寡合结构作为分子统治者来识别接受器茎5端和T C循环之间的不变距离.
- 十二摄像头内的五个活跃站点专门用于5个领袖分离,而剩余的七个站点表现出3个拖车分离活动.
结论:
- 哈普十二基化对于特定的tRNA前识别和高效的5 - 领导者处理至关重要,证明了与其他RNase P酶的融合进化.
- 哈普十二摄像头表现出双重功能,处理5个领导和3个拖车序列,这是这个类型的酶的新发现.
- 这项研究强调了蛋白质寡合化如何推动酶功能的演变,使核酸加工中的适应和获取新角色成为可能.
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