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TitleCryo-EM structure of a minimal reaction center-light-harvesting complex from the phototrophic bacterium Chloroflexus aurantiacus.
Journal, issue, pagesJ Integr Plant Biol, Vol. 67, Issue 4, Page 967-978, Year 2025
Publish dateFeb 6, 2025
AuthorsGuoqiang Huang / Shishang Dong / Lin Ma / Lin Li / Jinxin Ju / Mei-Jiao Wang / Jian-Ping Zhang / Sen-Fang Sui / Xiaochun Qin /
PubMed AbstractPhotosynthetic organisms have developed various light-harvesting antenna systems to capture light and transfer energy to reaction centers (RCs). Simultaneous utilization of the integral membrane ...Photosynthetic organisms have developed various light-harvesting antenna systems to capture light and transfer energy to reaction centers (RCs). Simultaneous utilization of the integral membrane light-harvesting antenna (LH complex) and the extrinsic antenna (chlorosomes) makes the phototrophic bacterium Chloroflexus (Cfx.) aurantiacus an ideal model for studying filamentous anoxygenic phototrophs (FAPs). Here, we determined the structure of a minimal RC-LH photocomplex from Cfx. aurantiacus J-10-fl (CaRC-LH) at 3.05-Å resolution. The CaRC-LH binds only to seven LH subunits, which form a crescent-shaped antenna surrounding the movable menaquinone-10 (Q) binding site of CaRC. In this complex with minimal LH units, an extra antenna is required to ensure sufficient light-gathering, providing a clear explanation for the presence of chlorosomes in Cfx. aurantiacus. More importantly, the semicircle of the antenna represents a novel RC-LH assembly pattern. Our structure provides a basis for understanding the existence of chlorosomes in Cfx. aurantiacus and the possible assembly pattern of RC-LH.
External linksJ Integr Plant Biol / PubMed:39912559
MethodsEM (single particle)
Resolution3.05 Å
Structure data

39177

8ydm

EMDB-39177, PDB-8ydm:
Cryo-EM structure of CaRC-LH complex from Chloroflexus aurantiacus
Method: EM (single particle) / Resolution: 3.05 Å

EMDB-62657: EMReady processed EM map of CaRC-LH complex from Chloroflexus aurantiacus
Method: EM (single particle) / Resolution: 3.05 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A

ChemComp-U4Z:
gamma-Carotene

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

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

ChemComp-MQE:
2-methyl-3-[(2E,6E,10E,14E,18E,22E,26E,30E,34E,38E)-3,7,11,15,19,23,27,31,35,39,43-undecamethyltetratetraconta-2,6,10,1

ChemComp-BPH:
BACTERIOPHEOPHYTIN A

ChemComp-MN:
Unknown entry

Source
  • chloroflexus aurantiacus j-10-fl (bacteria)
KeywordsPHOTOSYNTHESIS

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