Escherichia coli tRNase Z can shut down growth probably by removing amino acids from aminoacyl‐tRNAs

Escherichia coli tRNase Z can shut down growth probably by removing amino acids from aminoacyl‐tRNAs
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大肠杆菌 tRNase Z 可能通过去除氨酰基-tRNA 中的氨基酸来停止生长

DOI:
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发表时间:
2008
期刊:
影响因子:
2.1
通讯作者:
M. Nashimoto
M. Nashimoto
中科院分区:
生物学4区
文献类型:
--
作者:
H. Takaku;M. Nashimoto

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在大多数生物中,tRNase Z被认为是tRNA分子3′加工所必需的。然而,大肠杆菌tRNase Z基因在正常生长条件下似乎是不稳定的,它的存在仍然是一个谜。在这里,我们深入研究了各种(前)tRNA的良好底物的E。colitRNaseZ在体外对成熟tRNA进行了酶切,发现该酶能去除成熟tRNA的3′端CCA残基,而不受其核苷酸修饰的影响。此外,我们还发现E.大肠杆菌tRNase Z,当在细胞中充分表达时,可以通过去除氨酰-tRNA中的氨基酸来关闭生长。我们在体外证实了E. coli tRNase Z具有从氨酰-tRNA分子上切除3′末端氨基酸残基的活性。目前的数据表明,tRNase Z可能有助于调节细胞的生长速度,抑制翻译在某些压力条件下。
In most organisms, tRNase Z is considered to be essential for 3′ processing of tRNA molecules. The Escherichia coli tRNase Z gene, however, appears to be dispensable under normal growth conditions, and its existence remained an enigma. Here we intensively examined various (pre‐)tRNAs for good substrates of E. coli tRNase Z in vitro, and found that the enzyme can remove the 3′ terminal CCA residues from mature tRNAs regardless of their nucleotide modifications. Furthermore, we discovered that E. coli tRNase Z, when sufficiently expressed in the cell, can shut down growth probably by removing amino acids from aminoacyl‐tRNAs. We confirmed in vitro that E. coli tRNase Z exceptionally possesses the activity that cleaves off the 3′ terminal residues charging an amino acid from an aminoacyl‐tRNA molecule. The current data suggest that tRNase Z might help modulate a cell growth rate by repressing translation under some stressful conditions.
DOI: 10.1261/rna.4206
发表时间: 2006-06
期刊: RNA
影响因子: 4.5
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期刊: BIOCHEMISTRY
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