8Z4V
LH2 complex from Ectothiorhodospira haloalkaliphila at near-atomic resolution
This is a non-PDB format compatible entry.
Summary for 8Z4V
| Entry DOI | 10.2210/pdb8z4v/pdb |
| EMDB information | 39770 |
| Descriptor | Light-harvesting protein B:800-850 subunit beta, Light-harvesting protein B-800/850 alpha chain, BACTERIOCHLOROPHYLL A, ... (5 entities in total) |
| Functional Keywords | photosynthesis, light-harvesing, purple sulfur bacteria, cryo-em |
| Biological source | Ectothiorhodospira haloalkaliphila ATCC 51935 More |
| Total number of polymer chains | 16 |
| Total formula weight | 133004.41 |
| Authors | Burtseva, A.D.,Baymukhametov, T.N.,Popov, V.O.,Ashikhmin, A.A.,Boyko, K.M. (deposition date: 2024-04-17, release date: 2025-01-01, Last modification date: 2025-02-19) |
| Primary citation | Burtseva, A.D.,Baymukhametov, T.N.,Bolshakov, M.A.,Makhneva, Z.K.,Mardanov, A.V.,Tsedilin, A.M.,Zhang, H.,Popov, V.O.,Ashikhmin, A.A.,Boyko, K.M. Near-atomic cryo-EM structure of the light-harvesting complex LH2 from the sulfur purple bacterium Ectothiorhodospira haloalkaliphila. Structure, 33:311-320.e3, 2025 Cited by PubMed 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. PubMed: 39694041DOI: 10.1016/j.str.2024.11.015 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (1.7 Å) |
Structure validation
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