Processing of the Escherichia coli leuX tRNA transcript, encoding tRNA(Leu5), requires either the 3'-->5' exoribonuclease polynucleotide phosphorylase or RNase P to remove the Rho-independent transcription terminator.

Processing of the Escherichia coli leuX tRNA transcript, encoding tRNA(Leu5), requires either the 3'-->5' exoribonuclease polynucleotide phosphorylase or RNase P to remove the Rho-independent transcription terminator.
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编码tRNA(LEU5)的大肠杆菌Leux tRNA转录物的处理需要3' - > 5'驱核酸酶核酸酶多核苷酸磷酸化酶或RNase P,以去除独立的转录终结剂。

DOI:
10.1093/nar/gkp997
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发表时间:
2010-01
影响因子:
14.9
通讯作者:
Kushner SR
Kushner SR
中科院分区:
生物学2区
文献类型:
--
作者:
Mohanty BK;Kushner SR

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在这里,我们报道了在大肠杆菌中tRNALeu5的一种独特的处理途径,其中外切核酸酶多核苷酸磷酸化酶(PNPase)从leuX转录本中移除Rho不依赖的转录终止子,而不需要Rh1B RNA解旋酶。我们的数据首次证明了PNPase可以在体内有效地降解含有二级结构的RNA底物。此外,RNaseP是一种内切核酸酶,通常产生tRNAs的成熟5‘端,它不依赖于PNPase的活性而有效地去除LeuX终止子。RNaseP切割CCA决定簇下游的4-7个核苷酸,产生RNaseII的底物,从而去除额外的3-4个核苷酸。随后,RNaseT通过去除CCA决定簇下游剩余的1-3个核苷酸来完成3‘成熟过程。核糖核酸酶E、G和Z不参与终止子的去除。这些结果进一步证明,大肠杆菌tRNA的加工机制比之前想象的要多样化得多。
Here we report a unique processing pathway in Escherichia coli for tRNALeu5 in which the exoribonuclease polynucleotide phosphorylase (PNPase) removes the Rho-independent transcription terminator from the leuX transcript without requiring the RhlB RNA helicase. Our data demonstrate for the first time that PNPase can efficiently degrade an RNA substrate containing secondary structures in vivo. Furthermore, RNase P, an endoribonuclease that normally generates the mature 5′-ends of tRNAs, removes the leuX terminator inefficiently independent of PNPase activity. RNase P cleaves 4–7 nt downstream of the CCA determinant generating a substrate for RNase II, which removes an additional 3–4 nt. Subsequently, RNase T completes the 3′ maturation process by removing the remaining 1–3 nt downstream of the CCA determinant. RNase E, G and Z are not involved in terminator removal. These results provide further evidence that the E. coli tRNA processing machinery is far more diverse than previously envisioned.
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