Structure and energy transfer pathways of the plant photosystem I-LHCI supercomplex

Michihiro Suga; Xiaochun Qin; Tingyun Kuang; Jian-Ren Shen

doi:10.1016/j.sbi.2016.04.004

Structure and energy transfer pathways of the plant photosystem I-LHCI supercomplex

Curr Opin Struct Biol. 2016 Aug:39:46-53. doi: 10.1016/j.sbi.2016.04.004. Epub 2016 Apr 28.

Authors

Michihiro Suga¹, Xiaochun Qin², Tingyun Kuang³, Jian-Ren Shen⁴

Affiliations

¹ Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Tsushima Naka 3-1-1, Okayama 700-8530, Japan.
² Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Tsushima Naka 3-1-1, Okayama 700-8530, Japan; Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
³ Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. Electronic address: kuangty@ibcas.ac.cn.
⁴ Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Okayama University, Tsushima Naka 3-1-1, Okayama 700-8530, Japan; Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. Electronic address: shen@okayama-u.ac.jp.

PMID: 27131043
DOI: 10.1016/j.sbi.2016.04.004

Abstract

Photosystem I (PSI) is one of the two photosystems in oxygenic photosynthesis, and absorbs light energy to generate reducing power for the reduction of NADP⁺ to NADPH with a quantum efficiency close to 100%. The plant PSI core forms a supercomplex with light-harvesting complex I (LHCI) with a total molecular weight of over 600kDa. Recent X-ray structure analysis of the PSI-LHCI membrane-protein supercomplex has revealed detailed arrangement of the light-harvesting pigments and other cofactors especially within LHCI. Here we introduce the overall structure of the PSI-LHCI supercomplex, and then focus on the excited energy transfer (EET) pathways from LHCI to the PSI core and photoprotection mechanisms based on the structure obtained.

Publication types

Review
Research Support, Non-U.S. Gov't

MeSH terms

Energy Transfer*
Light-Harvesting Protein Complexes / chemistry*
Light-Harvesting Protein Complexes / metabolism*
Photochemical Processes
Photosystem I Protein Complex / chemistry*
Photosystem I Protein Complex / metabolism*
Plants / enzymology
Plants / metabolism*

Substances

Light-Harvesting Protein Complexes
Photosystem I Protein Complex