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• W2020931479 abstract "Abstract— Following the method of Johnson and Rajagopalan (1982) for obtaining Form B of molybdopterin cofactors, we observed a prominent fluorescence band at480–482 nm in purified NR of Neurospora crassa mutant albino-band after boiling the enzyme at acidic pH and readjusting the sample to alkaline pH. This fluorescence band is maximally excited at 410 nm and maximally emitting at pH 11 (“F-480pH11”); at pH4–7 only a featureless fluorescence band of low intensity remains (“F-480pH5”). The fluorescence ΔF-480 = F-480pH11 - F-480pHS is examined here. ΔF-480 is associated specifically with NADPH-dependent and MVH-dependent nitrate reduction activities and with cytochrome b-557 absorption. In a protease-digested preparation lacking NADPH-dependent NR activity, ΔF-480 is associated with MVH-dependent nitrate reduction. The ΔF-480 signal is followed during the course of purification of NR. Its size increases with increasing purity of the enzyme. In partially purified NR preparations and especially in aqueous extracts from mycelia of N. crassa, a second, strong fluorescence signal with a pH-dependent emission maximum at around 450 nm (maximally excited at350–370 nm) was found beside ΔF-480. This “unspecific” signal was lost during NR purification. A procedure is developed to demonstrate AF-480 also in presence of the unspecific (350-370/450 nm) signal as well as flavins. We deduce that the ΔF-480 component is part of the Mo cofactor of N. crassa NR and that the signal is caused by a pterin derivative. From calculations of total content of the AF-480 component in mycelia it is likely that in vivo it is shared also by other enzymes." @default.
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• W2020931479 date "1985-12-01" @default.
• W2020931479 modified "2023-09-27" @default.
• W2020931479 title "EVIDENCE FOR A PTERIN-DERIVATIVE ASSOCIATED WITH THE MOLYBDENUM COFACTOR OF Neurospora crassa NITRATE REDUCTASE" @default.
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• W2020931479 doi "https://doi.org/10.1111/j.1751-1097.1985.tb01646.x" @default.
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