基因
DNA
生物
抄写(语言学)
细胞生物学
核糖核酸
RNA聚合酶
聚合酶
计算生物学
转录组
遗传学
基因表达
语言学
哲学
作者
Ling Wang,John W. Watters,Xiangwu Ju,Shixin Liu
标识
DOI:10.1101/2022.10.23.513370
摘要
SUMMARY Genomic DNA is a crowded track where translocating motor proteins frequently collide. It remains unclear whether these collisions, generally thought to occur inadvertently, carry any physiological function. In this work, we developed a single-molecule assay to directly visualize the trafficking of individual E. coli RNA polymerases (RNAPs) on DNA. This assay enabled us to test the hypothesis that RNAP collisions drive bidirectional transcription termination of convergent gene pairs. We showed that the head-on collision between two converging RNAPs is necessary to prevent transcriptional readthrough, but insufficient to release the collided RNAPs from the DNA. Remarkably, co-directional collision from a trailing RNAP into the head-on collided complex dramatically increases the termination efficiency. Furthermore, a stem-loop structure formed in the nascent RNA is required for collisions to occur at well-defined positions between gene boundaries. These findings, corroborated by transcriptomic data, establish programmed RNAP collisions as an effective strategy to achieve precise gene expression and imply a broader role of genomic conflicts in cell physiology.
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