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• W1973006965 abstract "ABSTRACT The L-cluster is an all-iron homolog of nitrogenase cofactors. Driven by europium(II) diethylenetriaminepentaacetate [Eu(II)-DTPA], the isolated L-cluster is capable of ATP-independent reduction of CO and CN − to C 1 to C 4 and C 1 to C 6 hydrocarbons, respectively. Compared to its cofactor homologs, the L-cluster generates considerably more CH 4 from the reduction of CO and CN − , which could be explained by the presence of a “free” Fe atom that is “unmasked” by homocitrate as an additional site for methanation. Moreover, the elevated CH 4 formation is accompanied by a decrease in the amount of longer hydrocarbons and/or the lengths of the hydrocarbon products, illustrating a competition between CH 4 formation/release and C−C coupling/chain extension. These observations suggest the possibility of designing simpler synthetic clusters for hydrocarbon formation while establishing the L-cluster as a platform for mechanistic investigations of CO and CN − reduction without complications originating from the heterometal and homocitrate components. IMPORTANCE Nitrogenase is a metalloenzyme that is highly complex in structure and uniquely versatile in function. It catalyzes two reactions that parallel two important industrial processes: the reduction of nitrogen to ammonia, which parallels the Haber-Bosch process in ammonia production, and the reduction of carbon monoxide to hydrocarbons, which parallels the Fischer-Tropsch process in fuel production. Thus, the significance of nitrogenase can be appreciated from the perspective of the useful products it generates: (i) ammonia, the “fixed” nitrogen that is essential for the existence of the entire human population; and (ii) hydrocarbons, the “recycled” carbon fuel that could be used to directly address the worldwide energy shortage. This article provides initial insights into the catalytic characteristics of various nitrogenase cofactors in hydrocarbon formation. The reported assay system provides a useful tool for mechanistic investigations of this reaction while suggesting the possibility of designing bioinspired catalysts based on nitrogenase cofactors." @default.
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• W1973006965 date "2015-05-01" @default.
• W1973006965 modified "2023-10-03" @default.
• W1973006965 title "Insights into Hydrocarbon Formation by Nitrogenase Cofactor Homologs" @default.
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• W1973006965 doi "https://doi.org/10.1128/mbio.00307-15" @default.
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