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- W102564196 abstract "Assimilatory NADH:nitrate reductase contains FAD, heme and Mo-pterin arranged in an NADH{yields}FAD{yields}heme{yields}Mo-Pterin{yields}NO{sub 3} electron transfer sequence. A functional Mo-pterin center is essential for all nitrate-reducing activities. To assess the possible functional role of Met, a Se-Met substituted NR was obtained by addition of Se-Met to ammonia-grown Chlorella cells prior to induction of NR activity. Increase in NADH:dehydrogenase partial activities and nitrate reductase protein proceeded normally following induction but little or no nitrate-reducing activity was expressed. This effect was observed with as little as 10{sup {minus}5} Se-Met and was prevented by a 10-fold excess of Met. A less pronounced effect was observed with 10{sup {minus}4}M Se-Cys. The purified Se-Met substituted enzyme exhibited the same apparent physical size, spectral properties and NADH dehydrogenase activities as control NR but was devoid of nitrate-reducing activities. These results suggest that one or more Met residues are essential for the catalytic function of the molybdo-pterin center of assimilatory NR." @default.
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- W102564196 date "1991-03-11" @default.
- W102564196 modified "2023-09-23" @default.
- W102564196 title "Properties of seleno-methionine substituted assimilatory nitrate reductase" @default.
- W102564196 hasPublicationYear "1991" @default.
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