Journal
NATURE STRUCTURAL & MOLECULAR BIOLOGY
Volume 18, Issue 3, Pages 309-U94Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.2008
Keywords
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Funding
- National Natural Science Foundation of China [30530210, 30721003, 31021062]
- 973 Project [2006CB806505, 2006CB911001, 2011CBA00902]
- Chinese Academy of Sciences [KSCX2-YW-R-123]
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CP29, one of the minor light-harvesting complexes of higher-plant photosystem II, absorbs and transfers solar energy for photosynthesis and also has important roles in photoprotection. We have solved the crystal structure of spinach CP29 at 2.80-angstrom resolution. Each CP29 monomer contains 13 chlorophyll and 3 carotenoid molecules, which differs considerably from the major light-harvesting complex LHCII and the previously proposed CP29 model. The 13 chlorophyll-binding sites are assigned as eight chlorophyll a sites, four chlorophyll b and one putative mixed site occupied by both chlorophylls a and b. Based on the present X-ray structure, an integrated pigment network in CP29 is constructed. Two special clusters of pigment molecules, namely a615-a611-a612-Lut and Vio(Zea)-a603-a609, have been identified and might function as potential energy-quenching centers and as the exit or entrance in energy-transfer pathways.
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