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Genes Dev. 2009 May 15;23(10):1207-20. doi: 10.1101/gad.516509.
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A novel human AlkB homologue, ALKBH8, contributes to human bladder cancer progression.一种新型人类AlkB同源物ALKBH8促进人类膀胱癌进展。
Cancer Res. 2009 Apr 1;69(7):3157-64. doi: 10.1158/0008-5472.CAN-08-3530. Epub 2009 Mar 17.
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Ubiquitin-related modifier Urm1 acts as a sulphur carrier in thiolation of eukaryotic transfer RNA.泛素相关修饰因子Urm1在真核生物转运RNA硫醇化过程中作为硫载体发挥作用。
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A functional proteomics approach links the ubiquitin-related modifier Urm1 to a tRNA modification pathway.一种功能蛋白质组学方法将泛素相关修饰因子Urm1与一条tRNA修饰途径联系起来。
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MODOMICS: a database of RNA modification pathways. 2008 update.MODOMICS:RNA修饰途径数据库。2008年更新版。
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tRNA and protein methylase complexes mediate zymocin toxicity in yeast.转运RNA和蛋白质甲基化酶复合物介导酵母中zymocin的毒性作用。
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DNA protein kinase-dependent G2 checkpoint revealed following knockdown of ataxia-telangiectasia mutated in human mammary epithelial cells.在人乳腺上皮细胞中,共济失调毛细血管扩张症突变基因敲低后揭示了DNA蛋白激酶依赖性G2期检查点。
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人源 AlkB 同源物 ABH8 是一种 tRNA 甲基转移酶,对于摆动尿嘧啶修饰和 DNA 损伤存活是必需的。

Human AlkB homolog ABH8 Is a tRNA methyltransferase required for wobble uridine modification and DNA damage survival.

机构信息

Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02138, USA.

出版信息

Mol Cell Biol. 2010 May;30(10):2449-59. doi: 10.1128/MCB.01604-09. Epub 2010 Mar 22.

DOI:10.1128/MCB.01604-09
PMID:20308323
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2863699/
Abstract

tRNA nucleosides are extensively modified to ensure their proper function in translation. However, many of the enzymes responsible for tRNA modifications in mammals await identification. Here, we show that human AlkB homolog 8 (ABH8) catalyzes tRNA methylation to generate 5-methylcarboxymethyl uridine (mcm(5)U) at the wobble position of certain tRNAs, a critical anticodon loop modification linked to DNA damage survival. We find that ABH8 interacts specifically with tRNAs containing mcm(5)U and that purified ABH8 complexes methylate RNA in vitro. Significantly, ABH8 depletion in human cells reduces endogenous levels of mcm(5)U in RNA and increases cellular sensitivity to DNA-damaging agents. Moreover, DNA-damaging agents induce ABH8 expression in an ATM-dependent manner. These results expand the role of mammalian AlkB proteins beyond that of direct DNA repair and support a regulatory mechanism in the DNA damage response pathway involving modulation of tRNA modification.

摘要

tRNA 核苷被广泛修饰以确保其在翻译中的正常功能。然而,许多负责哺乳动物 tRNA 修饰的酶仍有待鉴定。在这里,我们表明人 AlkB 同源物 8(ABH8)催化 tRNA 甲基化,在某些 tRNA 的摆动位置生成 5-甲基羧甲基尿嘧啶(mcm(5)U),这是与 DNA 损伤存活相关的关键反密码子环修饰。我们发现 ABH8 与含有 mcm(5)U 的 tRNA 特异性相互作用,并且纯化的 ABH8 复合物在体外甲基化 RNA。重要的是,人细胞中 ABH8 的耗竭会降低 RNA 中内源性 mcm(5)U 的水平,并增加细胞对 DNA 损伤剂的敏感性。此外,DNA 损伤剂以 ATM 依赖性方式诱导 ABH8 的表达。这些结果扩展了哺乳动物 AlkB 蛋白的作用,超出了直接 DNA 修复的范围,并支持涉及 tRNA 修饰调节的 DNA 损伤反应途径中的调节机制。