8pzk | pdb_00008pzk

Crystal structure of the Orange Carotenoid Protein 2 (OCP2) from Gloeocapsa sp. PCC 7428

spinqualitylabelsall models 8pzk, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8pzk is a 1 chain structure with sequence from Gloeocapsa sp. PCC 7428. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: AZI, CSO, ECH, GOL, TRS Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function K9XH36_9CHRO Publication Abstract from PubMed The Orange Carotenoid Protein (OCP) is a unique photoreceptor crucial for cyanobacterial photoprotection. Best studied Synechocystis sp. PCC 6803 OCP belongs to the large OCP1 family. Downregulated by the Fluorescence Recovery Protein (FRP) in low-light, high-light-activated OCP1 binds to the phycobilisomes and performs non-photochemical quenching. Recently discovered families OCP2 and OCP3 remain structurally and functionally underexplored, and no systematic comparative studies have ever been conducted. Here we present two first crystal structures of OCP2 from morphoecophysiologically different cyanobacteria and provide their comprehensive structural, spectroscopic and functional comparison with OCP1, the recently described OCP3 and all-OCP ancestor. Structures enable correlation of spectroscopic signatures with the effective number of hydrogen and discovered here chalcogen bonds anchoring the ketocarotenoid in OCP, as well as with the rotation of the echinenone's beta-ionone ring in the CTD. Structural data also helped rationalize the observed differences in OCP/FRP and OCP/phycobilisome functional interactions. These data are expected to foster OCP research and applications in optogenetics, targeted carotenoid delivery and cyanobacterial biomass engineering. Structural framework for the understanding spectroscopic and functional signatures of the cyanobacterial Orange Carotenoid Protein families.,Sluchanko NN, Maksimov EG, Slonimskiy YB, Varfolomeeva LA, Bukhanko AY, Egorkin NA, Tsoraev GV, Khrenova MG, Ge B, Qin S, Boyko KM, Popov VO Int J Biol Macromol. 2024 Jan;254(Pt 2):127874. doi: , 10.1016/j.ijbiomac.2023.127874. Epub 2023 Nov 7. PMID:37939760 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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