6su3

Crystal structure of the 48C12 heliorhodopsin in the violet form at pH 8.8

spinqualitylabelsall models 6su3, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6su3 is a 2 chain structure with sequence from Actinobacteria bacterium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, LFA, OLA, OLC, RET, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Rhodopsins are the most abundant light-harvesting proteins. A new family of rhodopsins, heliorhodopsins (HeRs), has recently been discovered. Unlike in the known rhodopsins, in HeRs the N termini face the cytoplasm. The function of HeRs remains unknown. We present the structures of the bacterial HeR-48C12 in two states at the resolution of 1.5 A, which highlight its remarkable difference from all known rhodopsins. The interior of HeR's extracellular part is completely hydrophobic, while the cytoplasmic part comprises a cavity (Schiff base cavity [SBC]) surrounded by charged amino acids and containing a cluster of water molecules, presumably being a primary proton acceptor from the Schiff base. At acidic pH, a planar triangular molecule (acetate) is present in the SBC. Structure-based bioinformatic analysis identified 10 subfamilies of HeRs, suggesting their diverse biological functions. The structures and available data suggest an enzymatic activity of HeR-48C12 subfamily and their possible involvement in fundamental redox biological processes. High-resolution structural insights into the heliorhodopsin family.,Kovalev K, Volkov D, Astashkin R, Alekseev A, Gushchin I, Haro-Moreno JM, Chizhov I, Siletsky S, Mamedov M, Rogachev A, Balandin T, Borshchevskiy V, Popov A, Bourenkov G, Bamberg E, Rodriguez-Valera F, Buldt G, Gordeliy V Proc Natl Acad Sci U S A. 2020 Feb 7. pii: 1915888117. doi:, 10.1073/pnas.1915888117. PMID:32034096 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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