8zk2

Cryo-EM structure of photosynthetic LH1-RC core complex of Roseospirillum parvum

spinqualitylabelsall models 8zk2, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8zk2 is a 36 chain structure with sequence from Roseospirillum parvum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.65Å Ligands: 8K6, BPH, CRT, FE, HEC, LMT, MG, MQ8, PGV Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q6XBJ5_9PROT The reaction center of purple bacteria contains a tightly bound cytochrome molecule which re-reduces the photo oxidized primary electron donor.[ARBA:ARBA00003196][PIRNR:PIRNR000017] Publication Abstract from PubMed Purple phototrophic bacteria produce two kinds of light-harvesting complexes that function to capture and transmit solar energy: the core antenna (LH1) and the peripheral antenna (LH2). The apoproteins of these antennas, encoded respectively by the genes pufBA and pucBA within and outside the photosynthetic gene cluster, respectively, exhibit conserved amino acid sequences and structural topologies suggesting they were derived from a shared ancestor. Here we present the structures of two photosynthetic complexes from Roseospirillum (Rss.) parvum 930I: an LH1-RC complex and a variant of the LH1 complex also encoded by pufBA that we designate as LH1'. The LH1-RC complex forms a closed elliptical structure consisting of 16 pairs of alphabeta-polypeptides that surrounds the RC. By contrast, the LH1' complex is a closed ring structure composed of 14 pairs of alphabeta-polypeptides, and it shows significant similarities to LH2 complexes both spectrally and structurally. Although LH2-like, the LH1' complex is larger than any known LH2 complexes, and genomic analyses of Rss. parvum revealed the absence of pucBA, genes that encode classical LH2 complexes. Characterization of the unique Rss. parvum photocomplexes not only underscores the diversity of such structures but also sheds new light on the evolution of light-harvesting complexes from phototrophic bacteria. Insights into the divergence of the photosynthetic LH1 complex obtained from structural analysis of the unusual photocomplexes of Roseospirillum parvum.,Wang XP, Wang GL, Fu Y, Minamino A, Zou MJ, Ma F, Xu B, Wang-Otomo ZY, Kimura Y, Madigan MT, Overmann J, Yu LJ Commun Biol. 2024 Dec 19;7(1):1658. doi: 10.1038/s42003-024-07354-4. PMID:39702771 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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