数字农科院2.0

RAS, a Pentatricopeptide Repeat Protein, Interacts with OsTRX z to Regulate Chloroplast Gene Transcription and RNA Processing

文献类型： 外文期刊

作者： Zhennan Qiu;Shiyong Wen;Peinan Sun;Dongdong Chen;Chunmiao Wang;Xiliang Song;Liying Xiao;Peiliang Zhang;Dongying Zhao;Cuiping Wen;Peiyan Guan;Xuechu Du;Yinghui Sun;Chenshan Xu;Jian Song

作者机构：

关键词： chloroplast development;PPR;rice;RNA editing;RNA splicing

期刊名称： Plants

ISSN： 2223-7747

年卷期： 2025 年 14 卷 2 期

页码：

收录情况： SCIE（2025版）

摘要： Thioredoxin z (TRX z) plays a significant role in chloroplast development by regulating the transcription of chloroplast genes. In this study, we identified a pentatricopeptide repeat (PPR) protein, rice albino seedling-lethal (RAS), that interacts with OsTRX z. This interaction was initially discovered by using a yeast two-hybrid (Y2H) screening technique and was further validated through Y2H and bimolecular fluorescence complementation (BiFC) experiments. RAS contains 16 PPR motifs and features a small MutS-related (SMR) domain at its C-terminus. CRISPR/Cas9-generated ras mutants exhibited an albino seedling-lethal phenotype characterized by abnormal chloroplast structures and a significantly reduced chlorophyll content. RAS localizes to the chloroplast and is predominantly expressed in young leaves. Mutations in RAS affect RNA editing at the rpl2, rps14, and ndhA sites, as well as RNA splicing at the rpl2, atpF, and ndhA transcripts within the chloroplast. Furthermore, the expression levels of genes associated with chloroplast formation are altered in the ras mutant. Both OsTRX z and RAS were found to interact with chloroplast signal recognition particle (cpSRP) proteins, indicating that their proper localization within the chloroplast may be dependent on the SRP pathway. Collectively, our findings highlight the critical role of RAS in chloroplast development, as it is involved in RNA processing and the regulation of chloroplast gene expression.

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