A deleterious Sar1c variant in rice inhibits export of seed storage proteins from the endoplasmic reticulum

文献类型： 外文期刊

第一作者： Bao, Xiuhao

作者： Bao, Xiuhao;Wang, Yongfei;Wang, Yunlong;Pan, Tian;Yu, Mingzhou;Zhang, Yu;Wu, Hongming;Zhang, Pengcheng;Ji, Yi;Yang, Hang;Jiang, Xiaokang;Jing, Ruonan;Gu, Chuanwei;Zhu, Jianping;Hao, Yuanyuan;Lei, Jie;Chen, Xiaoli;Chen, Rongbo;Sun, Yinglun;Jiang, Ling;Wang, Yihua;Wan, Jianmin;Qi, Yanzhou;Lei, Cailin;Yan, Mengyuan;Zhang, Binglei;Zhang, Shuang;Zhu, Yun;Zhang, Xin;Ren, Yulong;Wan, Jianmin;Qi, Yanzhou;Visser, Richard G. F.

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关键词： Oryza sativa; COPII; Sar1; Dominant-negative effect; Intracellular protein transport; Seed storage protein

期刊名称：PLANT MOLECULAR BIOLOGY （ 影响因子：4.335； 五年影响因子：5.197 ）

ISSN： 0167-4412

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收录情况： SCI

摘要： Key messageWe identified a dosage-dependent dominant negative form of Sar1c, which confirms the essential role of COPII system in mediating ER export of storage proteins in rice endosperm. Higher plants accumlate large amounts of seed storage proteins (SSPs). However, mechanisms underlying SSP trafficking are largely unknown, especially the ER-Golgi anterograde process. Here, we showed that a rice glutelin precursor accumulation13 (gpa13) mutant exhibited floury endosperm and overaccumulated glutelin precursors, which phenocopied the reported RNAi-Sar1abc line. Molecular cloning revealed that the gpa13 allele encodes a mutated Sar1c (mSar1c) with a deletion of two conserved amino acids Pro134 and Try135. Knockdown or knockout of Sar1c alone caused no obvious phenotype, while overexpression of mSar1c resulted in seedling lethality similar to the gpa13 mutant. Transient expression experiment in tobacco combined with subcellular fractionation experiment in gpa13 demonstrated that the expression of mSar1c affects the subcellular distribution of all Sar1 isoforms and Sec23c. In addition, mSar1c failed to interact with COPII component Sec23. Conversely, mSar1c competed with Sar1a/b/d to interact with guanine nucleotide exchange factor Sec12. Together, we identified a dosage-dependent dominant negative form of Sar1c, which confirms the essential role of COPII system in mediating ER export of storage proteins in rice endosperm.

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