Beyond ligand binding: Single molecule observation reveals how riboswitches integrate multiple signals to balance bacterial gene regulation

IF 6.1 2区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Current opinion in structural biology Pub Date : 2024-07-26 DOI:10.1016/j.sbi.2024.102893
Adrien Chauvier, Nils G. Walter
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Abstract

Riboswitches are specialized RNA structures that orchestrate gene expression in response to sensing specific metabolite or ion ligands, mostly in bacteria. Upon ligand binding, these conformationally dynamic RNA motifs undergo structural changes that control critical gene expression processes such as transcription termination and translation initiation, thereby enabling cellular homeostasis and adaptation. Because RNA folds rapidly and co-transcriptionally, riboswitches make use of the low complexity of RNA sequences to adopt alternative, transient conformations on the heels of the transcribing RNA polymerase (RNAP), resulting in kinetic partitioning that defines the regulatory outcome. This review summarizes single molecule microscopy evidence that has begun to unveil a sophisticated network of dynamic, kinetically balanced interactions between riboswitch architecture and the gene expression machinery that, together, integrate diverse cellular signals.

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超越配体结合:单分子观察揭示了核糖开关如何整合多种信号以平衡细菌基因调控。
核糖开关是一种特异的 RNA 结构,能协调基因表达,以响应特定代谢物或离子配体的感应,主要存在于细菌中。与配体结合后,这些构象动态 RNA 基团会发生结构变化,控制转录终止和翻译启动等关键基因表达过程,从而实现细胞平衡和适应。由于 RNA 的折叠速度很快,而且是共转录的,因此核糖开关利用 RNA 序列的低复杂性,在转录 RNA 聚合酶(RNAP)的跟进下采用替代性的瞬时构象,从而产生动力学分区,确定调控结果。本综述总结了单分子显微镜证据,这些证据已开始揭示核糖开关结构与基因表达机制之间复杂的动态平衡相互作用网络,它们共同整合了各种细胞信号。
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来源期刊
Current opinion in structural biology
Current opinion in structural biology 生物-生化与分子生物学
CiteScore
12.20
自引率
2.90%
发文量
179
审稿时长
6-12 weeks
期刊介绍: Current Opinion in Structural Biology (COSB) aims to stimulate scientifically grounded, interdisciplinary, multi-scale debate and exchange of ideas. It contains polished, concise and timely reviews and opinions, with particular emphasis on those articles published in the past two years. In addition to describing recent trends, the authors are encouraged to give their subjective opinion of the topics discussed. In COSB, we help the reader by providing in a systematic manner: 1. The views of experts on current advances in their field in a clear and readable form. 2. Evaluations of the most interesting papers, annotated by experts, from the great wealth of original publications. [...] The subject of Structural Biology is divided into twelve themed sections, each of which is reviewed once a year. Each issue contains two sections, and the amount of space devoted to each section is related to its importance. -Folding and Binding- Nucleic acids and their protein complexes- Macromolecular Machines- Theory and Simulation- Sequences and Topology- New constructs and expression of proteins- Membranes- Engineering and Design- Carbohydrate-protein interactions and glycosylation- Biophysical and molecular biological methods- Multi-protein assemblies in signalling- Catalysis and Regulation
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