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Structural Study of the Light-Harvesting Complex LH2 from the Purple Sulfur Bacteria Ectothiorhodospira haloalkaliphila by Cryoelectronic Microscopy.
- Source :
- Crystallography Reports; Dec2023, Vol. 68 Issue 6, p879-885, 7p
- Publication Year :
- 2023
-
Abstract
- The primary processes of photosynthesis for purple photosynthesising bacteria occur in light-harvesting (LH) complexes. The LH2 complex contains polypeptides; bacteriochlorophyll; and, in most cases, carotenoids. There are three known spatial structures of LH2 complexes from purple nonsulfur bacteria; however, high-resolution structures have not been established for purple sulfur bacteria. The results of the structural study of two light-harvesting complexes LH2 from purple sulfur bacteria Ectothiorhodospira haloalkaliphila by cryoelectronic microscopy are reported. Images of carotenoid-containing (LH2+) and carotenoidless (LH2–) variants of the complex, demonstrating a characteristic architecture of the objects of this type, are obtained. A 3D reconstruction of LH2+ is performed with a resolution of 4.5 Å; it coincides with the previously established crystal structure. The presence of particles of different morphology is shown for LH2–. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10637745
- Volume :
- 68
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Crystallography Reports
- Publication Type :
- Academic Journal
- Accession number :
- 175254103
- Full Text :
- https://doi.org/10.1134/S1063774523601132