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TitleCryo-EM structure of the Blastochloris viridis LH1-RC complex at 2.9 Å.
Journal, issue, pagesNature, Vol. 556, Issue 7700, Page 203-208, Year 2018
Publish dateApr 4, 2018
AuthorsPu Qian / C Alistair Siebert / Peiyi Wang / Daniel P Canniffe / C Neil Hunter /
PubMed AbstractThe light-harvesting 1-reaction centre (LH1-RC) complex is a key functional component of bacterial photosynthesis. Here we present a 2.9 Å resolution cryo-electron microscopy structure of the ...The light-harvesting 1-reaction centre (LH1-RC) complex is a key functional component of bacterial photosynthesis. Here we present a 2.9 Å resolution cryo-electron microscopy structure of the bacteriochlorophyll b-based LH1-RC complex from Blastochloris viridis that reveals the structural basis for absorption of infrared light and the molecular mechanism of quinone migration across the LH1 complex. The triple-ring LH1 complex comprises a circular array of 17 β-polypeptides sandwiched between 17 α- and 16 γ-polypeptides. Tight packing of the γ-apoproteins between β-polypeptides collectively interlocks and stabilizes the LH1 structure; this, together with the short Mg-Mg distances of bacteriochlorophyll b pairs, contributes to the large redshift of bacteriochlorophyll b absorption. The 'missing' 17th γ-polypeptide creates a pore in the LH1 ring, and an adjacent binding pocket provides a folding template for a quinone, Q , which adopts a compact, export-ready conformation before passage through the pore and eventual diffusion to the cytochrome bc complex.
External linksNature / PubMed:29618818
MethodsEM (single particle)
Resolution2.87 Å
Structure data

3951

6et5

EMDB-3951, PDB-6et5:
Reaction centre light harvesting complex 1 from Blc. virids
Method: EM (single particle) / Resolution: 2.87 Å

Chemicals

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

ChemComp-BCB:
BACTERIOCHLOROPHYLL B / Bacteriochlorophyll

ChemComp-BPB:
BACTERIOPHEOPHYTIN B / Pheophytin

ChemComp-UQ9:
Ubiquinone-9

ChemComp-FE:
Unknown entry / Iron

ChemComp-SO4:
SULFATE ION / Sulfate

ChemComp-LDA:
LAURYL DIMETHYLAMINE-N-OXIDE / LDAO, detergent*YM / Lauryldimethylamine oxide

ChemComp-MQ9:
MENAQUINONE-9 / Vitamin K2

ChemComp-NS5:
15-cis-1,2-dihydroneurosporene

ChemComp-NS0:
all-trans-1,2-dihydroneurosporene

Source
  • blastochloris viridis (bacteria)
  • Rhodopseudomonas viridis (bacteria)
KeywordsPHOTOSYNTHESIS / Reaction centre light harvesting complex 1 Blc. viridis Cryo-EM RC-LH1 Photosynthesis

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