LTD is a protein required for sorting light-harvesting chlorophyll-binding proteins to the chloroplast SRP pathway

Min Ouyang, Xiaoyi Li, Jinfang Ma, Wei Chi, Jianwei Xiao, Meijuan Zou, Fan Chen, Congming Lu and Lixin Zhang ()
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Min Ouyang: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Xiaoyi Li: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Jinfang Ma: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Wei Chi: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Jianwei Xiao: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Meijuan Zou: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Fan Chen: Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences
Congming Lu: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.
Lixin Zhang: Photosynthesis Research Center, National Center for Plant Gene Research, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China.

Nature Communications, 2011, vol. 2, issue 1, 1-11

Abstract: Abstract Higher plants require chloroplasts for essential functions in photosynthesis and other important physiological processes, such as sugar, lipid and amino-acid biosynthesis. Most chloroplast proteins are nuclear-encoded proteins that are synthesized in the cytosol as precursors, and imported into chloroplasts by protein translocases in the outer and inner chloroplast envelope. The imported chloroplast proteins are then translocated into or across the thylakoid membrane by four distinct pathways. However, the mechanisms by which the imported nuclear-encoded proteins are delivered to these pathways remain largely unknown. Here we show that an Arabidopsis ankyrin protein, LTD (mutation of which causes the light-harvesting chlorophyll-binding protein translocation defect), is localized in the chloroplast and using yeast two-hybrid screens demonstrate that LTD interacts with both proteins from the signal recognition particle (SRP) pathway and the inner chloroplast envelope. Our study shows that LTD is essential for the import of light-harvesting chlorophyll-binding proteins and subsequent routing of these proteins to the chloroplast SRP-dependent pathway.

Date: 2011
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DOI: 10.1038/ncomms1278

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