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TitleCryo-EM structure of a Ca-bound photosynthetic LH1-RC complex containing multiple αβ-polypeptides.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 4955, Year 2020
Publish dateOct 2, 2020
AuthorsKazutoshi Tani / Ryo Kanno / Yuki Makino / Malgorzata Hall / Mizuki Takenouchi / Michie Imanishi / Long-Jiang Yu / Jörg Overmann / Michael T Madigan / Yukihiro Kimura / Akira Mizoguchi / Bruno M Humbel / Zheng-Yu Wang-Otomo /
PubMed AbstractThe light-harvesting-reaction center complex (LH1-RC) from the purple phototrophic bacterium Thiorhodovibrio strain 970 exhibits an LH1 absorption maximum at 960 nm, the most red-shifted absorption ...The light-harvesting-reaction center complex (LH1-RC) from the purple phototrophic bacterium Thiorhodovibrio strain 970 exhibits an LH1 absorption maximum at 960 nm, the most red-shifted absorption for any bacteriochlorophyll (BChl) a-containing species. Here we present a cryo-EM structure of the strain 970 LH1-RC complex at 2.82 Å resolution. The LH1 forms a closed ring structure composed of sixteen pairs of the αβ-polypeptides. Sixteen Ca ions are present in the LH1 C-terminal domain and are coordinated by residues from the αβ-polypeptides that are hydrogen-bonded to BChl a. The Ca-facilitated hydrogen-bonding network forms the structural basis of the unusual LH1 redshift. The structure also revealed the arrangement of multiple forms of α- and β-polypeptides in an individual LH1 ring. Such organization indicates a mechanism of interplay between the expression and assembly of the LH1 complex that is regulated through interactions with the RC subunits inside.
External linksNat Commun / PubMed:33009385 / PubMed Central
MethodsEM (single particle)
Resolution2.82 Å
Structure data

30314

7c9r

EMDB-30314, PDB-7c9r:
STRUCTURE OF PHOTOSYNTHETIC LH1-RC SUPER-COMPLEX OF THIORHODOVIBRIO STRAIN 970
Method: EM (single particle) / Resolution: 2.82 Å

Chemicals

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE / Heme B

ChemComp-MG:
Unknown entry

ChemComp-CA:
Unknown entry

ChemComp-DGA:
DIACYL GLYCEROL / Diglyceride

ChemComp-PGV:
(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE / phospholipid*YM / Phosphatidylglycerol

ChemComp-BCL:
BACTERIOCHLOROPHYLL A / Bacteriochlorophyll

ChemComp-BPH:
BACTERIOPHEOPHYTIN A / Pheophytin

ChemComp-UQ8:
Ubiquinone-8

ChemComp-8K6:
Octadecane / Octadecane

ChemComp-FE:
Unknown entry / Iron

ChemComp-MQ8:
MENAQUINONE 8 / Vitamin K2

ChemComp-CDL:
CARDIOLIPIN / phospholipid*YM / Cardiolipin

ChemComp-H4X:
(6~{E},8~{E},10~{E},12~{E},14~{E},16~{E},18~{E},20~{E},22~{E},24~{E},26~{E})-2,31-dimethoxy-2,6,10,14,19,23,27,31-octamethyl-dotriaconta-6,8,10,12,14,16,18,20,22,24,26-undecaene

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

Source
  • thiorhodovibrio sp. 970 (bacteria)
KeywordsPHOTOSYNTHESIS / LH1-RC / PURPLE BACTERIA

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