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Brown, Katherine A.; Harris, Derek F.; Wilker, Molly B.; Rasmussen, Andrew; Khadka, Nimesh; Hamby, Hayden; Keable, Stephen; Dukovic, Gordana; Peters, John W.; Seefeldt, Lance C.; King, Paul W.
Science (American Association for the Advancement of Science), 04/2016, Letnik: 352, Številka: 6284Journal Article
The splitting of dinitrogen (N₂) and reduction to ammonia (NH₃) is a kinetically complex and energetically challenging multistep reaction. In the Haber-Bosch process, N₂ reduction is accomplished at high temperature and pressure, whereas N₂ fixation by the enzyme nitrogenase occurs under ambient conditions using chemical energy from adenosine 5'-triphosphate (ATP) hydrolysis. We show that cadmium sulfide (CdS) nanocrystals can be used to photosensitize the nitrogenase molybdenum-iron (MoFe) protein, where light harvesting replaces ATP hydrolysis to drive the enzymatic reduction of N₂ into NH₃. The turnover rate was 75 per minute, 63% of the ATP-coupled reaction rate for the nitrogenase complex under optimal conditions. Inhibitors of nitrogenase (i.e., acetylene, carbon monoxide, and dihydrogen) suppressed N₂ reduction. The CdS:MoFe protein biohybrids provide a photochemical model for achieving light-driven N₂ reduction to NH₃.
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