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TitleCryo-EM structures of photocomplexes from the free-living aerobic anoxygenic phototrophic bacterium Erythrobacter sanguineus.
Journal, issue, pagesStructure, Year 2025
Publish dateNov 21, 2025
AuthorsXing-Yu Yue / Guang-Lei Wang / Mei-Juan Zou / Fei Ma / Zheng-Yu Wang-Otomo / Michael T Madigan / Long-Jiang Yu /
PubMed AbstractAerobic anoxygenic phototrophic bacteria (AAPB) are widely distributed in nature and they are important members of the marine phototrophic community. However, a structural and functional ...Aerobic anoxygenic phototrophic bacteria (AAPB) are widely distributed in nature and they are important members of the marine phototrophic community. However, a structural and functional understanding of the AAPB photosynthetic apparatus is still lacking. Here, we present cryo-EM structures of the LH1-RC (core) and LH2 (peripheral) photocomplexes from the model aerobic phototroph Erythrobacter (Ery.) sanguineus. The LH1 αβ-heterodimers bind the carotenoids bacteriorubixanthinal and caloxanthin-pigments that are absent from anaerobic anoxygenic phototrophs-to form a closed ring structure. Ery. sanguineus LH1-RC contains a lipid-anchored polypeptide unrelated to any of the auxiliary proteins identified in the core complexes of purple bacteria so far. The Ery. sanguineus LH2 complex shows unique absorption characteristics, with its Q transition being blue-shifted to 814 nm. This work provides structural insights into the unusual photosynthetic properties of AAPB and points to new avenues to further explore their biology.
External linksStructure / PubMed:41274286
MethodsEM (single particle)
Resolution2.27 - 2.74 Å
Structure data

63365

9lt4

EMDB-63365, PDB-9lt4:
Cryo-EM structure of light harvesting complex 2 from Ery. sanguineus
Method: EM (single particle) / Resolution: 2.74 Å

63370

9lti

EMDB-63370, PDB-9lti:
Cryo-EM structure of LH1-RC from Ery. sanguineus
Method: EM (single particle) / Resolution: 2.27 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A

PDB-1eld:
Structural analysis of the active site of porcine pancreatic elastase based on the x-ray crystal structures of complexes with trifluoroacetyl-dipeptide-anilide inhibitors

PDB-1el2:
SOLUTION STRUCTURE OF A MODIFIED HUMAN TELOMERE FRAGMENT (STRUCTURE "A")

ChemComp-8K6:
Octadecane

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

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

ChemComp-BPH:
BACTERIOPHEOPHYTIN A

ChemComp-UQ8:
Ubiquinone-8

ChemComp-FE:
Unknown entry

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-PEF:
DI-PALMITOYL-3-SN-PHOSPHATIDYLETHANOLAMINE / phospholipid*YM

ChemComp-PO4:
PHOSPHATE ION

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

Source
  • erythrobacter sanguineus (bacteria)
KeywordsPHOTOSYNTHESIS / light harvesting complex 2 / Erythrobacte sanguineus

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