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-Structure paper
Title | The 2.4 Å cryo-EM structure of a heptameric light-harvesting 2 complex reveals two carotenoid energy transfer pathways. |
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Journal, issue, pages | Sci Adv, Vol. 7, Issue 7, Year 2021 |
Publish date | Feb 12, 2021 |
Authors | Alastair 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 Abstract | 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 ...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 links | Sci Adv / PubMed:33579696 / PubMed Central |
Methods | EM (single particle) |
Resolution | 2.38 Å |
Structure data | EMDB-11516, PDB-6zxa: |
Chemicals | ChemComp-BCL: ChemComp-QS2: ChemComp-QSE: |
Source |
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Keywords | PHOTOSYNTHESIS / purple bacteria / light harvesting complex / Marichromatium purpuratum / okenone. |