Mutation of Rice BC12/GDD1, Which Encodes a Kinesin-Like Protein That Binds to a GA Biosynthesis Gene Promoter, Leads to Dwarfism with Impaired Cell Elongation

文献类型： 外文期刊

第一作者： Li, Juan

作者： Li, Juan;Jiang, Jiafu;Xu, Yunyuan;Zhang, Cui;Xiao, Jun;Du, Cheng;Luo, Wei;Chong, Kang;Li, Juan;Zhang, Cui;Xiao, Jun;Du, Cheng;Qian, Qian;Zou, Guoxing;Chen, Mingluan;Huang, Yunqing;Feng, Yuqi;Cheng, Zhukuan;Yuan, Ming;Chong, Kang

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关键词： kinesin: EC 3.6.4.4;gibberellic acid: 77-06-5;brittle culm12;phenotype;cell elongation;electrophoretic mobility shift;cellular physiological process;plant dwarfism

期刊名称：PLANT CELL （ 影响因子：11.277； 五年影响因子：12.061 ）

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收录情况： SCI

摘要： The kinesins are a family of microtubule-based motor proteins that move directionally along microtubules and are involved in many crucial cellular processes, including cell elongation in plants. Less is known about kinesins directly regulating gene transcription to affect cellular physiological processes. Here, we describe a rice (Oryza sativa) mutant, gibberellin-deficient dwarf1 (gdd1), that has a phenotype of greatly reduced length of root, stems, spikes, and seeds. This reduced length is due to decreased cell elongation and can be rescued by exogenous gibberellic acid (GA3) treatment. GDD1 was cloned by a map-based approach, was expressed constitutively, and was found to encode the kinesin-like protein BRITTLE CULM12 (BC12). Microtubule cosedimentation assays revealed that BC12/GDD1 bound to microtubules in an ATP-dependent manner. Whole-genome microarray analysis revealed the expression of ent-kaurene oxidase (KO2), which encodes an enzyme involved in GA biosynthesis, was downregulated in gdd1. Electrophoretic mobility shift and chromatin immunoprecipitation assays revealed that GDD1 bound to the element ACCAACTTGAA in the KO2 promoter. In addition, GDD1 was shown to have transactivation activity. The level of endogenous GAs was reduced in gdd1, and the reorganization of cortical microtubules was altered. Therefore, BC12/GDD1, a kinesin-like protein with transcription regulation activity, mediates cell elongation by regulating the GA biosynthesis pathway in rice.

分类号： Q942

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