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YGL9, encoding the putative chloroplast signal recognition particle 43 kDa protein in rice, is involved in chloroplast development

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Journal of Integrative Agriculture 2016年第5期15卷 944-953页

作者： WANG Zhong-wei ZHANG Tian-quan XING Ya-di ZENG Xiao-qin WANG Ling LIU Zhong-xian SHI Jun-qiong ZHU Xiao-yan MA Ling LI Yun-feng LING Ying-hua SANG Xian-chun HE Guang-hua Chongqing Key Laboratory of Application and Safety Control of genetically Modified Crops Rice Research Institute Southwest University Chongqing 400715 P.R. China

The nuclear-encoded light-harvesting chlorophyll a/b-binding proteins（LHCPs） are specifically translocated from the stroma into the thylakoid membrane through the chloroplast signal recognition particle（cp SRP） pathway. The cp SRP is composed of a cp SRP43 protein and a cp SRP54 protein, and it forms a soluble transit complex with LHCP in the chloroplast stroma. Here, we identified the YGL9 gene that is predicted to encode the probable rice cp SRP43 protein from a rice yellow-green leaf mutant. A phylogenetic tree showed that an important conserved protein family, cp SRP43, is present in almost all green photosynthetic organisms such as higher plants and green algae. Sequence analysis showed that YGL9 comprises a chloroplast transit peptide, three chromodomains and four ankyrin repeats, and the chromodomains and ankyrin repeats are probably involved in protein-protein interactions. Subcellular localization showed that YGL9 is localized in the chloroplast. Expression pattern analysis indicated that YGL9 is mainly expressed in green leaf sheaths and leaves. Quantitative real-time PCR analysis showed that the expression levels of genes associated with pigment metabolism, chloroplast development and photosynthesis were distinctly affected in the ygl9 mutant. These results indicated that YGL9 is possibly involved in pigment metabolism, chloroplast development and photosynthesis in rice.

关键词： Oryza sativa yellow-green leaf gene cpSRP43 light-harvesting chlorophyll a/b-binding protein

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