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- W2152243313 abstract "ABSTRACT Glycerol trinitrate reductase (NerA) from Agrobacterium radiobacter , a member of the old yellow enzyme (OYE) family of oxidoreductases, was expressed in and purified from Escherichia coli . Denaturation of pure enzyme liberated flavin mononucleotide (FMN), and spectra of NerA during reduction and reoxidation confirmed its catalytic involvement. Binding of FMN to apoenzyme to form the holoenzyme occurred with a dissociation constant of ca. 10 −7 M and with restoration of activity. The NerA-dependent reduction of glycerol trinitrate (GTN; nitroglycerin) by NADH followed ping-pong kinetics. A structural model of NerA based on the known coordinates of OYE showed that His-178, Asn-181, and Tyr-183 were close to FMN in the active site. The NerA mutation H178A produced mutant protein with bound FMN but no activity toward GTN. The N181A mutation produced protein that did not bind FMN and was isolated in partly degraded form. The mutation Y183F produced active protein with the same k cat as that of wild-type enzyme but with altered K m values for GTN and NADH, indicating a role for this residue in substrate binding. Correlation of the ratio of K m GTN to K m NAD(P)H , with sequence differences for NerA and several other members of the OYE family of oxidoreductases that reduce GTN, indicated that Asn-181 and a second Asn-238 that lies close to Tyr-183 in the NerA model structure may influence substrate specificity." @default.
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- W2152243313 date "2004-03-15" @default.
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- W2152243313 title "Characterization of Glycerol Trinitrate Reductase (NerA) and the Catalytic Role of Active-Site Residues" @default.
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- W2152243313 doi "https://doi.org/10.1128/jb.186.6.1802-1810.2004" @default.
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