5ZJI

Structure of photosystem I supercomplex with light-harvesting complexes I and II

Summary for 5ZJI

• Entry DOI: 10.2210/pdb5zji/pdb
• EMDB information: 6932
• Descriptor: Chlorophyll a-b binding protein, chloroplastic, Photosystem I reaction center subunit III, Photosystem I reaction center subunit V, ... (33 entities in total)
• Functional Keywords: photosystem, antenna, supercomplex, state transition, membrane protein
• Biological source: Zea mays (Maize); More
• Total number of polymer chains: 21
• Total formula weight: 747989.57

Authors

Pan, X.W.,Ma, J.,Su, X.D.,Cao, P.,Liu, Z.F.,Zhang, X.Z.,Li, M. (deposition date: 2018-03-20, release date: 2018-06-20, Last modification date: 2019-11-06)

Primary citation

Pan, X.,Ma, J.,Su, X.,Cao, P.,Chang, W.,Liu, Z.,Zhang, X.,Li, M.
Structure of the maize photosystem I supercomplex with light-harvesting complexes I and II.
Science, 360:1109-1113, 2018

PubMed Abstract: Plants regulate photosynthetic light harvesting to maintain balanced energy flux into photosystems I and II (PSI and PSII). Under light conditions favoring PSII excitation, the PSII antenna, light-harvesting complex II (LHCII), is phosphorylated and forms a supercomplex with PSI core and the PSI antenna, light-harvesting complex I (LHCI). Both LHCI and LHCII then transfer excitation energy to the PSI core. We report the structure of maize PSI-LHCI-LHCII solved by cryo-electron microscopy, revealing the recognition site between LHCII and PSI. The PSI subunits PsaN and PsaO are observed at the PSI-LHCI interface and the PSI-LHCII interface, respectively. Each subunit relays excitation to PSI core through a pair of chlorophyll molecules, thus revealing previously unseen paths for energy transfer between the antennas and the PSI core.

PubMed: 29880686
DOI: 10.1126/science.aat1156

Experimental method

ELECTRON MICROSCOPY (3.3 Å)