7av4

Dark state structure of the C432S mutant of Fatty Acid Photodecarboxylase (FAP)

spinqualitylabelsall models 7av4, resolution 1.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7av4 is a 1 chain structure with sequence from Chlorella variabilis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.936Å Ligands: FAD, GOL, STE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FAP_CHLVA Catalyzes the decarboxylation of free fatty acids to n-alkanes or n-alkenes in response to blue light (PubMed:28860382, PubMed:30106504, PubMed:30673222). Substrate preference is toward fatty acids with C16 or C17 chains (PubMed:28860382, PubMed:30106504, PubMed:30673222). Saturated fatty acids are converted to alkanes, not alkenes (PubMed:28860382). The decarboxylation is initiated through electron abstraction from the fatty acid by the photo-excited FAD (PubMed:28860382). Publication Abstract from PubMed Fatty acid photodecarboxylase (FAP) is a photoenzyme with potential green chemistry applications. By combining static, time-resolved, and cryotrapping spectroscopy and crystallography as well as computation, we characterized Chlorella variabilis FAP reaction intermediates on time scales from subpicoseconds to milliseconds. High-resolution crystal structures from synchrotron and free electron laser x-ray sources highlighted an unusual bent shape of the oxidized flavin chromophore. We demonstrate that decarboxylation occurs directly upon reduction of the excited flavin by the fatty acid substrate. Along with flavin reoxidation by the alkyl radical intermediate, a major fraction of the cleaved carbon dioxide unexpectedly transformed in 100 nanoseconds, most likely into bicarbonate. This reaction is orders of magnitude faster than in solution. Two strictly conserved residues, R451 and C432, are essential for substrate stabilization and functional charge transfer. Mechanism and dynamics of fatty acid photodecarboxylase.,Sorigue D, Hadjidemetriou K, Blangy S, Gotthard G, Bonvalet A, Coquelle N, Samire P, Aleksandrov A, Antonucci L, Benachir A, Boutet S, Byrdin M, Cammarata M, Carbajo S, Cuine S, Doak RB, Foucar L, Gorel A, Grunbein M, Hartmann E, Hienerwadel R, Hilpert M, Kloos M, Lane TJ, Legeret B, Legrand P, Li-Beisson Y, Moulin SLY, Nurizzo D, Peltier G, Schiro G, Shoeman RL, Sliwa M, Solinas X, Zhuang B, Barends TRM, Colletier JP, Joffre M, Royant A, Berthomieu C, Weik M, Domratcheva T, Brettel K, Vos MH, Schlichting I, Arnoux P, Muller P, Beisson F Science. 2021 Apr 9;372(6538). pii: 372/6538/eabd5687. doi:, 10.1126/science.abd5687. PMID:33833098 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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