7WFG

Subcomplexes A and E in NDH complex from Arabidopsis

Summary for 7WFG

• Entry DOI: 10.2210/pdb7wfg/pdb
• EMDB information: 32465
• Descriptor: NAD(P)H-quinone oxidoreductase subunit H, chloroplastic, IRON/SULFUR CLUSTER, NAD(P)H-quinone oxidoreductase subunit I, chloroplastic, ... (10 entities in total)
• Functional Keywords: subcomplex a, subcomplex e, supercomplex, arabidopsis, plant, cyclic electron transport, electron transport
• Biological source: Arabidopsis thaliana (thale cress); More
• Total number of polymer chains: 9
• Total formula weight: 209010.43

Authors

Pan, X.W.,Li, M. (deposition date: 2021-12-26, release date: 2022-03-16, Last modification date: 2024-06-26)

Primary citation

Su, X.,Cao, D.,Pan, X.,Shi, L.,Liu, Z.,Dall'Osto, L.,Bassi, R.,Zhang, X.,Li, M.
Supramolecular assembly of chloroplast NADH dehydrogenase-like complex with photosystem I from Arabidopsis thaliana.
Mol Plant, 15:454-467, 2022

PubMed Abstract: Cyclic electron transport/flow (CET/CEF) in chloroplasts is a regulatory process essential for the optimization of plant photosynthetic efficiency. A crucial CEF pathway is catalyzed by a membrane-embedded NADH dehydrogenase-like (NDH) complex that contains at least 29 protein subunits and associates with photosystem I (PSI) to form the NDH-PSI supercomplex. Here, we report the 3.9 Å resolution structure of the Arabidopsis thaliana NDH-PSI (AtNDH-PSI) supercomplex. We constructed structural models for 26 AtNDH subunits, among which 11 are unique to chloroplasts and stabilize the core part of the NDH complex. In the supercomplex, one NDH can bind up to two PSI-light-harvesting complex I (PSI-LHCI) complexes at both sides of its membrane arm. Two minor LHCIs, Lhca5 and Lhca6, each present in one PSI-LHCI, interact with NDH and contribute to supercomplex formation and stabilization. Collectively, our study reveals the structural details of the AtNDH-PSI supercomplex assembly and provides a molecular basis for further investigation of the regulatory mechanism of CEF in plants.

PubMed: 35123031
DOI: 10.1016/j.molp.2022.01.020

Experimental method

ELECTRON MICROSCOPY (4.33 Å)