Primary Citation of Related Structures:   7XQP
PubMed Abstract: 
Photosystem I (PSI) possesses a variable supramolecular organization among different photosynthetic organisms to adapt to different light environments. Mosses are evolutionary intermediates that diverged from aquatic green algae and evolved into land plants. The moss Physcomitrium patens (P. patens) has a light-harvesting complex (LHC) superfamily more diverse than those of green algae and higher plants. Here, we solved the structure of a PSI-LHCI-LHCII-Lhcb9 supercomplex from P. patens at 2.68 Å resolution using cryo-electron microscopy. This supercomplex contains one PSI-LHCI, one phosphorylated LHCII trimer, one moss-specific LHC protein, Lhcb9, and one additional LHCI belt with four Lhca subunits. The complete structure of PsaO was observed in the PSI core. One Lhcbm2 in the LHCII trimer interacts with PSI core through its phosphorylated N terminus, and Lhcb9 mediates assembly of the whole supercomplex. The complicated pigment arrangement provided important information for possible energy-transfer pathways from the peripheral antennae to the PSI core.
Organizational Affiliation: 
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
University of Chinese Academy of Science, Beijing, China.
Department of Biophysics and Department of Pathology of Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
China National Botanical Garden, Beijing, China.
College of Life Sciences, Capital Normal University, Beijing, China.
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China. hanguangye@ibcas.ac.cn.
China National Botanical Garden, Beijing, China. hanguangye@ibcas.ac.cn.
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China. shen@cc.okayama-u.ac.jp.
China National Botanical Garden, Beijing, China. shen@cc.okayama-u.ac.jp.
The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China. shen@cc.okayama-u.ac.jp.
Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan. shen@cc.okayama-u.ac.jp.
Department of Biophysics and Department of Pathology of Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China. xzhang1999@zju.edu.cn.
Center of Cryo-Electron Microscopy, Zhejiang University School of Medicine, Hangzhou, China. xzhang1999@zju.edu.cn.
Liangzhu Laboratory, Zhejiang University Medical Center, Hangzhou, China. xzhang1999@zju.edu.cn.