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TitleThe 2.4 Å cryo-EM structure of a heptameric light-harvesting 2 complex reveals two carotenoid energy transfer pathways.
Journal, issue, pagesSci Adv, Vol. 7, Issue 7, Year 2021
Publish dateFeb 12, 2021
AuthorsAlastair T Gardiner / Katerina Naydenova / Pablo Castro-Hartmann / Tu C Nguyen-Phan / Christopher J Russo / Kasim Sader / C Neil Hunter / Richard J Cogdell / Pu Qian /
PubMed AbstractWe report the 2.4 Ångström resolution structure of the light-harvesting 2 (LH2) complex from () determined by cryogenic electron microscopy. The structure contains a heptameric ring that is ...We report the 2.4 Ångström resolution structure of the light-harvesting 2 (LH2) complex from () determined by cryogenic electron microscopy. The structure contains a heptameric ring that is unique among all known LH2 structures, explaining the unusual spectroscopic properties of this bacterial antenna complex. We identify two sets of distinct carotenoids in the structure and describe a network of energy transfer pathways from the carotenoids to bacteriochlorophyll molecules. The geometry imposed by the heptameric ring controls the resonant coupling of the long-wavelength energy absorption band. Together, these details reveal key aspects of the assembly and oligomeric form of purple bacterial LH2 complexes that were previously inaccessible by any technique.
External linksSci Adv / PubMed:33579696 / PubMed Central
MethodsEM (single particle)
Resolution2.38 Å
Structure data

EMDB-11516, PDB-6zxa:
LH2 complex from Marichromatium purpuratum
Method: EM (single particle) / Resolution: 2.38 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A / Bacteriochlorophyll

ChemComp-QS2:
9-cis-okenone

ChemComp-QSE:
all-trans okenone

Source
  • Marichromatium purpuratum (bacteria)
  • marichromatium purpuratum 984 (bacteria)
KeywordsPHOTOSYNTHESIS / purple bacteria / light harvesting complex / Marichromatium purpuratum / okenone.

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