6rnv

The crystal structure of Thermosynechococcus elongatus protochlorophyllide oxidoreductase (POR)

spinqualitylabelsall models 6rnv, resolution 1.27Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6rnv is a 1 chain structure with sequence from Thermosynechococcus vestitus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.27Å Ligands: CL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8DLC1_THEVB Phototransformation of protochlorophyllide (Pchlide) to chlorophyllide (Chlide).[RuleBase:RU365001] Publication Abstract from PubMed The enzyme protochlorophyllide oxidoreductase (POR) catalyses a light-dependent step in chlorophyll biosynthesis that is essential to photosynthesis and, ultimately, all life on Earth(1-3). POR, which is one of three known light-dependent enzymes(4,5), catalyses reduction of the photosensitizer and substrate protochlorophyllide to form the pigment chlorophyllide. Despite its biological importance, the structural basis for POR photocatalysis has remained unknown. Here we report crystal structures of cyanobacterial PORs from Thermosynechococcus elongatus and Synechocystis sp. in their free forms, and in complex with the nicotinamide coenzyme. Our structural models and simulations of the ternary protochlorophyllide-NADPH-POR complex identify multiple interactions in the POR active site that are important for protochlorophyllide binding, photosensitization and photochemical conversion to chlorophyllide. We demonstrate the importance of active-site architecture and protochlorophyllide structure in driving POR photochemistry in experiments using POR variants and protochlorophyllide analogues. These studies reveal how the POR active site facilitates light-driven reduction of protochlorophyllide by localized hydride transfer from NADPH and long-range proton transfer along structurally defined proton-transfer pathways. Structural basis for enzymatic photocatalysis in chlorophyll biosynthesis.,Zhang S, Heyes DJ, Feng L, Sun W, Johannissen LO, Liu H, Levy CW, Li X, Yang J, Yu X, Lin M, Hardman SJO, Hoeven R, Sakuma M, Hay S, Leys D, Rao Z, Zhou A, Cheng Q, Scrutton NS Nature. 2019 Oct 23. pii: 10.1038/s41586-019-1685-2. doi:, 10.1038/s41586-019-1685-2. PMID:31645759 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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