Mechanisms of Transcription-translation Coupling in Escherichia coli
In prokaryotes like Escherichia coli(E.coli),transcription tends to be coupled with translation,which is usually manifested in the mutual regulation of transcription and translation such as transcription polarity,transcription attenuation and synchronization of transcription and translation rates.Indirect coupling and physical coupling are two different models of the coupling.Indirect coupling maintained by the alarmone(p)ppGpp may require the assistance of DksA and TufA proteins.Physical coupling could be divided into those mediated by NusG or RfaH factors and those induced via"collision"under non-factor condition.Changes in transcription or translation in response to pressure will lead to mutual transitions among several coupling modes.Coupling is necessary for normal gene expression,and its release will contribute to adverse events such as transcription termination,R-loop formation,conflict between replication and transcription and mRNA cleavage.The related technologies of structural biology have clearly demonstrated the structural details and characteristics of partial coupled expressomes.These technologies,combined with methods like multiomics analysis,will provide deeper insights into the coupling.Significantly,the study of the coupling may bring new ideas for development of the targeted antibiotics.
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