Malonylome analysis in developing rice (Oryza saliva) seeds suggesting that protein lysine malonylation is well-conserved and overlaps with acetylation and succinylation substantially

文献类型： 外文期刊

第一作者： Mujahid, Hana

作者： Mujahid, Hana;Meng, Xiaoxi;Xing, Shihai;Peng, Zhaohua;Peng, Xiaojun;Wang, Cailin

作者机构：

关键词： Lysine malonylation;Post-translational modification;Malonylome;Plant;Rice;Seed

期刊名称：JOURNAL OF PROTEOMICS （ 影响因子：4.044； 五年影响因子：4.02 ）

ISSN： 1874-3919

年卷期： 2018 年 170 卷

页码：

收录情况： SCI

摘要： In recent years, lysine malonylation has garnered wide spread interest due to its potential regulatory roles. While studies have been performed in bacteria, mouse, and human, the involvement and the biological function of this modification in plant are still largely unknown. We examined the global proteome profile of lysine malonylation in developing rice seeds using affinity enrichment followed by LC-MS/MS analysis. We identified 421 malonylated lysine sites across 247 proteins. Functional analyses showed predominant presence of malonylated proteins in metabolic processes, including carbon metabolism, glycolysis/gluconeogenesis, TCA cycle, as well as photosynthesis. Malonylation was also detected on enzymes in starch biosynthesis pathway in developing rice seeds. In addition, we found a remarkable overlap among the malonylated, succinylated and acetylated sites identified in rice. Furthermore, malonylation at conserved sites of homologous proteins was observed across organisnis of different kingdoms, including mouse, human, and bacteria. Finally, distinct motifs were identified when the rice malonylation sites were analyzed and conserved motifs were observed from bacterium to human and rice. Our results provide an initial understanding of the lysine malonylome in plants. The study has critical reference value for future understanding of the biological function of protein lysine malonylation in plants. Biological significance: Lysine malonylation is a newly discovered acylation with functional potential in regulating cellular metabolisms and activities. However, the malonylation status has not been reported in plants. Grain yield and quality, mainly determined during cereal seed development, are closely related to food security, human health and economic value. To evaluate malonylation level in plants and the possible regulatory functions of malonylation in seed development, we conducted comprehensive analyses of malonylome in developing rice seeds. A total of 421 malonylated lysine sites from 247 proteins were identified, which involved in multiple critical metabolic processes, including central carbon metabolism, lipid metabolism, photosynthesis, and starch biosynthesis. We found that charged amino acids, lysine and arginine, were the preferred residues in positions flanking the modified lysines. Highly conserved modification sites on both histone and non-histone proteins were observed among different organisms through sequence alignment analysis. More interestingly, a large number of modification sites shared by malonylation, acetylation and succinylation were identified in rice. The study presents a comprehensive understanding of malonylome in plants, which will serve as an initial platform for further investigation of the functions of lysine malonylation, especially in cereal seeds development.

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