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Structure paper

TitleStructural insights into NDH-1 mediated cyclic electron transfer.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 888, Year 2020
Publish dateFeb 14, 2020
AuthorsChunli Zhang / Jin Shuai / Zhaoxing Ran / Jiaohong Zhao / Zhenfang Wu / Rijing Liao / Jian Wu / Weimin Ma / Ming Lei /
PubMed AbstractNDH-1 is a key component of the cyclic-electron-transfer around photosystem I (PSI CET) pathway, an important antioxidant mechanism for efficient photosynthesis. Here, we report a 3.2-Å-resolution ...NDH-1 is a key component of the cyclic-electron-transfer around photosystem I (PSI CET) pathway, an important antioxidant mechanism for efficient photosynthesis. Here, we report a 3.2-Å-resolution cryo-EM structure of the ferredoxin (Fd)-NDH-1L complex from the cyanobacterium Thermosynechococcus elongatus. The structure reveals three β-carotene and fifteen lipid molecules in the membrane arm of NDH-1L. Regulatory oxygenic photosynthesis-specific (OPS) subunits NdhV, NdhS and NdhO are close to the Fd-binding site whilst NdhL is adjacent to the plastoquinone (PQ) cavity, and they play different roles in PSI CET under high-light stress. NdhV assists in the binding of Fd to NDH-1L and accelerates PSI CET in response to short-term high-light exposure. In contrast, prolonged high-light irradiation switches on the expression and assembly of the NDH-1MS complex, which likely contains no NdhO to further accelerate PSI CET and reduce ROS production. We propose that this hierarchical mechanism is necessary for the survival of cyanobacteria in an aerobic environment.
External linksNat Commun / PubMed:32060291 / PubMed Central
MethodsEM (single particle)
Resolution3.2 - 5.2 Å
Structure data

0849

6l7o

EMDB-0849, PDB-6l7o:
cryo-EM structure of cyanobacteria Fd-NDH-1L complex
Method: EM (single particle) / Resolution: 3.2 Å

0850

6l7p

EMDB-0850, PDB-6l7p:
cryo-EM structure of cyanobacteria NDH-1LdelV complex
Method: EM (single particle) / Resolution: 3.6 Å

EMDB-0851:
cryo-EM structure of cyanobacteria NDH-1LdelV complex
Method: EM (single particle) / Resolution: 5.2 Å

Chemicals

ChemComp-BCR:
BETA-CAROTENE

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-AJP:
Digitonin / detergent*YM

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER

Source
  • thermosynechococcus elongatus bp-1 (bacteria)
KeywordsPHOTOSYNTHESIS / photosystem I / cyclic electron transfer

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