Maize PPR278 Functions in Mitochondrial RNA Splicing and Editing

文献类型： 外文期刊

第一作者： Yang, Jing

作者： Yang, Jing;Li, Xinhai;Yang, Jing;Cui, Yang;Zhang, Xiangbo;Yang, Zhijia;Lai, Jinsheng;Song, Weibin;Yang, Jing;Cui, Yang;Zhang, Xiangbo;Yang, Zhijia;Lai, Jinsheng;Song, Weibin;Liang, Jingang

作者机构：

关键词： PPR protein; intron splicing; C-to-U RNA editing; maize; seed development

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

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年卷期： 2022 年 23 卷 6 期

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收录情况： SCI

摘要： Pentatricopeptide repeat (PPR) proteins are a large protein family in higher plants and play important roles during seed development. Most reported PPR proteins function in mitochondria. However, some PPR proteins localize to more than one organelle; functional characterization of these proteins remains limited in maize (Zea mays L.). Here, we cloned and analyzed the function of a P-subfamily PPR protein, PPR278. Loss-function of PPR278 led to a lower germination rate and other defects at the seedling stage, as well as smaller kernels compared to the wild type. PPR278 was expressed in all investigated tissues. Furthermore, we determined that PPR278 is involved in the splicing of two mitochondrial transcripts (nad2 intron 4 and nad5 introns 1 and 4), as well as RNA editing of C-to-U sites in 10 mitochondrial transcripts. PPR278 localized to the nucleus, implying that it may function as a transcriptional regulator during seed development. Our data indicate that PPR278 is involved in maize seed development via intron splicing and RNA editing in mitochondria and has potential regulatory roles in the nucleus.

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