Rice floury endosperm26 encoding a mitochondrial single-stranded DNA-binding protein is essential for RNA-splicing of mitochondrial genes and endosperm development
文献类型： 外文期刊
第一作者： Teng, Xuan
作者： Teng, Xuan;Wang, Yongfei;Liu, Linglong;Yang, Hang;Wu, Mingming;Chen, Xiaoli;Ren, Yulong;Wang, Yunlong;Duan, Erchao;Dong, Hui;Jiang, Ling;Zhang, Yuanyan;Zhang, Wenwei;Chen, Rongbo;Liu, Shijia;Liu, Xi;Tian, Yunlu;Chen, Liangming;Wang, Yihua;Wan, Jianmin;Ren, Yulong;Wan, Jianmin;Teng, Xuan;Liu, Linglong;Wang, Yunlong;Duan, Erchao;Dong, Hui;Jiang, Ling;Zhang, Wenwei;Liu, Shijia;Liu, Xi;Tian, Yunlu;Chen, Liangming;Wang, Yihua;Wan, Jianmin
作者机构：
关键词： Floury endosperm; Mitochondrion; Single-stranded DNA-binding protein; RNA splicing; Oryza sativa
期刊名称：PLANT SCIENCE （ 影响因子：4.2； 五年影响因子：4.9 ）
ISSN： 0168-9452
年卷期： 2024 年 346 卷
页码：
收录情况： SCI
摘要： Endosperm, the major storage organ in cereal grains, determines the grain yield and quality. Mitochondria provide the energy for dry matter accumulation, in the endosperm development. Although mitochondrial singlestranded DNA-binding proteins (mtSSBs) play a canonical role in the maintenance of single-stranded mitochondrial DNA, their molecular functions in RNA processing and endosperm development remain obscure. Here, we report a defective rice endosperm mutant, floury endosperm26 (flo26), which develops abnormal starch grains in the endosperm. Map-based cloning and complementation experiments showed that FLO26 allele encodes a mitochondrial single-stranded DNA-binding protein, named as mtSSB1.1. Loss of function of mtSSB1.1 affects the transcriptional level of many mitochondrially-encoded genes and RNA splicing of nad1, a core component of respiratory chain complex I in mitochondria. As a result, dysfunctional mature nad1 led to dramatically decreased complex I activity, thereby reducing ATP production. Our results reveal that mtSSB1.1 plays an important role in the maintenance of mitochondrial function and endosperm development by stabilizing the splicing of mitochondrial RNA in rice.
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