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TitleCryo-EM structure of the photosynthetic RC-LH1-PufX supercomplex at 2.8-Å resolution.
Journal, issue, pagesSci Adv, Vol. 7, Issue 25, Year 2021
Publish dateJun 16, 2021
AuthorsLaura Bracun / Atsushi Yamagata / Bern M Christianson / Tohru Terada / Daniel P Canniffe / Mikako Shirouzu / Lu-Ning Liu /
PubMed AbstractThe reaction center (RC)-light-harvesting complex 1 (LH1) supercomplex plays a pivotal role in bacterial photosynthesis. Many RC-LH1 complexes integrate an additional protein PufX that is key for ...The reaction center (RC)-light-harvesting complex 1 (LH1) supercomplex plays a pivotal role in bacterial photosynthesis. Many RC-LH1 complexes integrate an additional protein PufX that is key for bacterial growth and photosynthetic competence. Here, we present a cryo-electron microscopy structure of the RC-LH1-PufX supercomplex from at 2.8-Å resolution. The RC-LH1-PufX monomer contains an LH ring of 15 αβ-polypeptides with a 30-Å gap formed by PufX. PufX acts as a molecular "cross brace" to reinforce the RC-LH1 structure. The unusual PufX-mediated large opening in the LH1 ring and defined arrangement of proteins and cofactors provide the molecular basis for the assembly of a robust RC-LH1-PufX supercomplex and efficient quinone transport and electron transfer. These architectural features represent the natural strategies for anoxygenic photosynthesis and environmental adaptation.
External linksSci Adv / PubMed:34134992 / PubMed Central
MethodsEM (single particle)
Resolution2.84 Å
Structure data

30656

7ddq

EMDB-30656, PDB-7ddq:
Structure of RC-LH1-PufX from Rhodobacter veldkampii
Method: EM (single particle) / Resolution: 2.84 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A / Bacteriochlorophyll

ChemComp-SPO:
SPHEROIDENE

ChemComp-U10:
UBIQUINONE-10 / Coenzyme Q10

ChemComp-BPH:
BACTERIOPHEOPHYTIN A / Pheophytin

ChemComp-FE:
Unknown entry / Iron

ChemComp-3PE:
1,2-Distearoyl-sn-glycerophosphoethanolamine / phospholipid*YM / Phosphatidylethanolamine

Source
  • rhodobacter veldkampii dsm 11550 (bacteria)
KeywordsPHOTOSYNTHESIS / membrane protein / light-harvesting / reaction center / pufx

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