The fail-safe system to rescue the stalled ribosomes in Escherichia coli.

The fail-safe system to rescue the stalled ribosomes in Escherichia coli.
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DOI:
10.3389/fmicb.2014.00156
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发表时间:
2014
影响因子:
5.2
通讯作者:
Chadani Y
Chadani Y
中科院分区:
生物学2区
文献类型:
--
作者:
Abo T;Chadani Y

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翻译终止于终止密码子。没有终止密码子,核糖体不能正确终止翻译,到达并停滞在缺少终止密码子的mRNA的3′端。细菌tmRNA介导的反式翻译释放这种停滞的核糖体,并通过添加特定的“降解标签”来靶向蛋白质产物进行降解。最近在大肠杆菌中发现了两种替代性核糖体拯救因子ArfA(YhdL)和ArfB(YaeJ)。这三个核糖体拯救系统在核糖体拯救的分子机制和活性方面彼此不同,但它们相互关联并合作以维持翻译系统的形状。这表明了核糖体拯救的生物学意义。
Translation terminates at stop codon. Without stop codon, ribosome cannot terminate translation properly and reaches and stalls at the 3′-end of the mRNA lacking stop codon. Bacterial tmRNA-mediated trans-translation releases such stalled ribosome and targets the protein product to degradation by adding specific “degradation tag.” Recently two alternative ribosome rescue factors, ArfA (YhdL) and ArfB (YaeJ), have been found in Escherichia coli. These three ribosome rescue systems are different each other in terms of molecular mechanism of ribosome rescue and their activity, but they are mutually related and co-operate to maintain the translation system in shape. This suggests the biological significance of ribosome rescue.
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