Biochemical aspects of bacterial strategies for handling the incomplete translation processes.
Biochemical aspects of bacterial strategies for handling the incomplete translation processes.
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DOI:
10.3389/fmicb.2014.00170
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发表时间:
2014
影响因子:
5.2
通讯作者:
Shimizu Y
中科院分区:
文献类型:
--
作者:
Shimizu Y
During protein synthesis in cells, translating ribosomes may encounter abnormal situations that lead to retention of immature peptidyl-tRNA on the ribosome due to failure of suitable termination processes. Bacterial cells handle such situations by employing three systems that rescue the stalled translation machinery. The transfer messenger RNA/small protein B (tmRNA/SmpB) system, also called the trans-translation system, rescues stalled ribosomes by initiating template switching from the incomplete mRNA to the short open reading frame of tmRNA, leading to the production of a protein containing a C-terminal tag that renders it susceptible to proteolysis. The ArfA/RF2 and ArfB systems rescue stalled ribosomes directly by hydrolyzing the immature peptidyl-tRNA remaining on the ribosome. Here, the biochemical aspects of these systems, as clarified by recent studies, are reviewed.
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