Arabidopsis TRM5 encodes a nuclear-localised bifunctional tRNA guanine and inosine-N1-methyltransferase that is important for growth

文献类型： 外文期刊

第一作者： Guo, Qianqian

作者： Guo, Qianqian;Shi, Shanshan;Fan, Diwen;Zhao, Ming;Zhou, Wenbin;Ng, Pei Qin;Li, Jun;Zhao, Jing;Trung Do;Searle, Iain;Wang, Hua;David, Rakesh;Mittal, Parul;Bock, Ralph

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2019 年 14 卷 11 期

页码：

收录情况： SCI

摘要： Modified nucleosides in tRNAs are critical for protein translation. N-1-methylguanosine-37 and N-1-methylinosine-37 in tRNAs, both located at the 3'-adjacent to the anticodon, are formed by Trm5. Here we describe Arabidopsis thaliana AtTRM5 (At3g56120) as a Trm5 ortholog. Attrm5 mutant plants have overall slower growth as observed by slower leaf initiation rate, delayed flowering and reduced primary root length. In Attrm5 mutants, mRNAs of flowering time genes are less abundant and correlated with delayed flowering. We show that AtTRM5 complements the yeast trm5 mutant, and in vitro methylates tRNA guanosine37 to produce N-1-methylguanosine (m(1)G). We also show in vitro that AtTRM5 methylates tRNA inosine-37 to produce N-1-methylinosine (m(1)I) and in Attrm5 mutant plants, we show a reduction of both N-1-methylguanosine and N-1-methylinosine. We also show that AtTRM5 is localized to the nucleus in plant cells. Proteomics data showed that photosynthetic protein abundance is affected in Attrm5 mutant plants. Finally, we show tRNA-Ala aminoacylation is not affected in Attrm5 mutants. However the abundance of tRNA-Ala and tRNA-Asp 5' half cleavage products are deduced. Our findings highlight the bifunctionality of AtTRM5 and the importance of the post-transcriptional tRNA modifications m(1)G and m(1)I at tRNA position 37 in general plant growth and development.

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