6ZXA

LH2 complex from Marichromatium purpuratum

Summary for 6ZXA

• Entry DOI: 10.2210/pdb6zxa/pdb
• EMDB information: 11516
• Descriptor: LHC domain-containing protein, Light-harvesting protein B:800-850 subunit beta, BACTERIOCHLOROPHYLL A, ... (5 entities in total)
• Functional Keywords: photosynthesis, purple bacteria, light harvesting complex, marichromatium purpuratum, okenone.
• Biological source: Marichromatium purpuratum 984; More
• Total number of polymer chains: 14
• Total formula weight: 122233.22

Authors

Gardiner, A.T.,Naydenova, K.,Castro-Hartmann, P.,Nguyen-Phan, T.C.,Russo, C.J.,Sader, K.,Hunter, C.N.,Cogdell, R.J.,Qian, P. (deposition date: 2020-07-29, release date: 2021-02-24, Last modification date: 2024-05-01)

Primary citation

Gardiner, A.T.,Naydenova, K.,Castro-Hartmann, P.,Nguyen-Phan, T.C.,Russo, C.J.,Sader, K.,Hunter, C.N.,Cogdell, R.J.,Qian, P.
The 2.4 angstrom cryo-EM structure of a heptameric light-harvesting 2 complex reveals two carotenoid energy transfer pathways.
Sci Adv, 7:-, 2021

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 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.

PubMed: 33579696
DOI: 10.1126/sciadv.abe4650

Experimental method

ELECTRON MICROSCOPY (2.38 Å)