5ncc
Structure of Fatty acid Photodecarboxylase in complex with FAD and palmitic acid
Structural highlights
FunctionFAP_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).[1] [2] [3] Publication Abstract from PubMedAlthough many organisms capture or respond to sunlight, few enzymes are known to be driven by light. Among these are DNA photolyases and the photosynthetic reaction centers. Here, we show that the microalga Chlorella variabilis NC64A harbors a photoenzyme that acts in lipid metabolism. This enzyme belongs to an algae-specific clade of the glucose-methanol-choline oxidoreductase family and catalyzes the decarboxylation of free fatty acids to n-alkanes or -alkenes in response to blue light. Crystal structure of the protein reveals a fatty acid-binding site in a hydrophobic tunnel leading to the light-capturing flavin adenine dinucleotide (FAD) cofactor. The decarboxylation is initiated through electron abstraction from the fatty acid by the photoexcited FAD with a quantum yield >80%. This photoenzyme, which we name fatty acid photodecarboxylase, may be useful in light-driven, bio-based production of hydrocarbons. An algal photoenzyme converts fatty acids to hydrocarbons.,Sorigue D, Legeret B, Cuine S, Blangy S, Moulin S, Billon E, Richaud P, Brugiere S, Coute Y, Nurizzo D, Muller P, Brettel K, Pignol D, Arnoux P, Li-Beisson Y, Peltier G, Beisson F Science. 2017 Sep 1;357(6354):903-907. doi: 10.1126/science.aan6349. PMID:28860382[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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