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Nitrite activation of nitrate reductase in higher plants

โœ Scribed by D. Kaplan; A. M. Mayer; S. H. Lips

Publisher
Springer-Verlag
Year
1978
Tongue
English
Weight
362 KB
Volume
138
Category
Article
ISSN
0032-0935

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โœฆ Synopsis

Comparative studies of nitrate-activated nitrate reductase (NR-NO2) and nitrate-induced nitrate reductase (NR-NO3) (EC 1.6.6.2) indicate that the enzymes differ in structure, heat stability, and pH dependence, but have the same cofactor requirment. NR-NO2 developes in barley (Hordeum vulgare L, var. Dvir) seedlings as NR-NO3 disappears. A transition from the active to the inactive form of nitrate reductase takes place. Nitrite seems to activate the inactive form of the enzyme.

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โœ T. Borner; R. R. Mendel; J. Schiemann ๐Ÿ“‚ Article ๐Ÿ“… 1986 ๐Ÿ› Springer-Verlag ๐ŸŒ English โš– 574 KB

The activities of nitrite reductase (EC 1.7.7.1) are 60-70% of wild-type activity in pigment-deficient leaves of the chloroplast-ribosomedeficient mutants 'albostrians' (Hordeum vulgare) and 'iojap' (Zea mays). The activity and apoprotein of nitrate reductase (EC 1.6.6.1.) are lacking in the barley