EMD-39770

Single-particle
1.7 Å
EMD-39770 Deposition: 17/04/2024
Map released: 01/01/2025
Last modified: 19/02/2025
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links

EMD-39770

LH2 complex from Ectothiorhodospira haloalkaliphila at near-atomic resolution

EMD-39770

Single-particle
1.7 Å
EMD-39770 Deposition: 17/04/2024
Map released: 01/01/2025
Last modified: 19/02/2025
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Sample Organism: Ectothiorhodospira haloalkaliphila ATCC 51935, Ectothiorhodospira haloalkaliphila
Sample: LH2 complex from Ectothiorhodospira haloalkaliphila
Fitted models: 8z4v

Deposition Authors: Burtseva AD, Baymukhametov TN, Popov VO, Ashikhmin AA, Boyko KM
Near-atomic cryo-EM structure of the light-harvesting complex LH2 from the sulfur purple bacterium Ectothiorhodospira haloalkaliphila.
PUBMED: 39694041
DOI: doi:10.1016/j.str.2024.11.015
ISSN: 0969-2126
ASTM: STRUE6
Abstract:
Bacteria with the simplest system for solar energy absorption and conversion use various types of light-harvesting complexes for these purposes. Light-harvesting complex 2 (LH2), an important component of the bacterial photosynthetic apparatus, has been structurally well characterized among purple non-sulfur bacteria. In contrast, so far only one high-resolution LH2 structure from sulfur bacteria is known. Here, we report the near-atomic resolution cryoelectron microscopy (cryo-EM) structure of the LH2 complex from the purple sulfur bacterium Ectothiorhodospira haloalkaliphila, which allowed us to determine the predominant polypeptide composition of this complex and the identification of the most probable type of its carotenoid. Comparison of our structure with the only known LH2 complex from a sulfur bacterium revealed severe differences in the overall ring-like organization. Expanding the architectural universe of bacterial light-harvesting complexes, our results demonstrate that, as observed for non-sulfur bacteria, the LH2 complexes of sulfur bacteria may also exhibit various types of spatial organization.