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- W2020105981 abstract "A comparative study of CO, NO, and nitrite as inhibitors of nitrogenase has been carried out. Confirming previous studies, we found that CO inhibits acetylene reduction, but not H2 evolution nor ATP hydrolysis. On the other hand, NO and nitrite both inhibit acetylene reduction, H2 evolution, and ATP hydrolysis. Nitrogenase inhibition by CO is readily reversible, whereas the effects of NO and nitrite are irreversible. NO was found to inactivate rapidly and irreversibly the Fe protein, but not the Mo-Fe protein. In the presence of NO, part of the iron of the Fe protein is complexed by bathophenanthrolinedisulfonate, which suggests that NO disrupts the Fe4S4 cluster present in the protein. Like NO, nitrite reacts preferentially with the Fe protein, and it also induces complexation of the iron by bathophenanthrolinedisulfonate. We found that under the conditions normally used for the assay of nitrogenase, nitrite is reduced by dithionite. Even though the latter reaction proceeds at a very low rate, enough NO is evolved to inhibit nitrogenase. In view of the striking similarities between the inhibitory effects of NO and nitrite, we suggest that nitrogenase may be inhibited not by nitrite itself, but rather by the nitric oxide produced by the reduction of nitrite." @default.
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- W2020105981 date "1981-08-01" @default.
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- W2020105981 title "Comparison of carbon monoxide, nitric oxide, and nitrite as inhibitors of the nitrogenase from Clostridium pasteurianum" @default.
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- W2020105981 doi "https://doi.org/10.1016/0003-9861(81)90186-7" @default.
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