A threonyl-tRNA synthetase-like protein has tRNA aminoacylation and editing activities.

A threonyl-tRNA synthetase-like protein has tRNA aminoacylation and editing activities.
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苏氨酰-tRNA 合成酶样蛋白具有 tRNA 氨酰化和编辑活性

DOI:
10.1093/nar/gky211
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发表时间:
2018-04-20
影响因子:
14.9
通讯作者:
Wang ED
Wang ED
中科院分区:
生物学2区
文献类型:
--
作者:
Chen Y;Ruan ZR;Wang Y;Huang Q;Xue MQ;Zhou XL;Wang ED

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在哺乳动物中,TARS和TARS2分别编码细胞质和线粒体苏酰trna合成酶(ThrRSs)。有趣的是,在高等真核生物中,第三个基因TARSL2编码ThrRS样蛋白(ThrRS- l),该蛋白与细胞质ThrRS高度同源,但具有不同的n端延伸(n -延伸)。ThrRS-L是否具有正则函数尚不清楚。在这项工作中,我们研究了小鼠ThrRS-L (mThrRS-L)的器官表达模式、细胞定位、典型氨基酰化和编辑活性。Tarsl2在小鼠组织中普遍存在,但表达不均匀。与小鼠细胞质ThrRS (mThrRS)不同,mThrRS- l既位于细胞质中,也位于细胞核中;核分布通过其c端的核定位序列介导。从HEK293T细胞中富集的天然mThrRS-L在氨基酰化和编辑中具有活性。为了准确考察mThrRS- l的体外催化性能,我们将mThrRS- l的N-extension替换为mThrRS的N-extension。嵌合蛋白(mThrRS-L-NT)具有氨基酸激活、氨基酰化和编辑活性。我们比较了mThrRS- l - nt和mThrRS的活性和跨种tRNA识别。尽管具有相似的氨基酰化活性,但mThrRS- l - nt和mThrRS在tRNA识别和编辑能力方面表现出差异。我们的研究结果首次分析了ThrRS-L的氨基酰化和编辑活性,提高了我们对Tarsl2的认识。
Abstract TARS and TARS2 encode cytoplasmic and mitochondrial threonyl-tRNA synthetases (ThrRSs) in mammals, respectively. Interestingly, in higher eukaryotes, a third gene, TARSL2, encodes a ThrRS-like protein (ThrRS-L), which is highly homologous to cytoplasmic ThrRS but with a different N-terminal extension (N-extension). Whether ThrRS-L has canonical functions is unknown. In this work, we studied the organ expression pattern, cellular localization, canonical aminoacylation and editing activities of mouse ThrRS-L (mThrRS-L). Tarsl2 is ubiquitously but unevenly expressed in mouse tissues. Different from mouse cytoplasmic ThrRS (mThrRS), mThrRS-L is located in both the cytoplasm and nucleus; the nuclear distribution is mediated via a nuclear localization sequence at its C-terminus. Native mThrRS-L enriched from HEK293T cells was active in aminoacylation and editing. To investigate the in vitro catalytic properties of mThrRS-L accurately, we replaced the N-extension of mThrRS-L with that of mThrRS. The chimeric protein (mThrRS-L-NT) has amino acid activation, aminoacylation and editing activities. We compared the activities and cross-species tRNA recognition between mThrRS-L-NT and mThrRS. Despite having a similar aminoacylation activity, mThrRS-L-NT and mThrRS exhibit differences in tRNA recognition and editing capacity. Our results provided the first analysis of the aminoacylation and editing activities of ThrRS-L, and improved our understanding of Tarsl2.
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DOI: 10.1093/nar/gku108
发表时间: 2014-04
影响因子: 14.9
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