Structural insights into energy regulation of light-harvesting complex CP29 from spinach

Xiaowei Pan, Mei Li, Tao Wan, Longfei Wang, Chenjun Jia, Zhiqiang Hou, Xuelin Zhao, Jiping Zhang, Wenrui Chang

Research output: Contribution to journalArticlepeer-review

Abstract

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-Å 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.

Original languageEnglish (US)
Pages (from-to)309-315
Number of pages7
JournalNature Structural and Molecular Biology
Volume18
Issue number3
DOIs
StatePublished - Mar 2011
Externally publishedYes

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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