Regulation of nitrate reduction in a cyanobacterium Phormidium uncinatum: Distinctive modes of ammonium-repression of nitrate and nitrite reductases

  • Palod A
  • Chauhan V
  • Bagchi S
  • 4

    Readers

    Mendeley users who have this article in their library.
  • 7

    Citations

    Citations of this article.

Abstract

Ammonium regulation of cellular nitrate and nitrite reductases (NR;NiR) was studied in Phormidium uncinatum. Diminished to low activities were found with ammonia and development of the enzymes in its absence required de novo protein synthesis but not nitrate. While an inhibition of ammonium metabolism via glutamine synthetase (GS) activity reversed the ammonium effect on NR. NiR was non-responsive. Development of NiR in such cultures in absence of ammonia however needed new protein synthesis. These data suggest that ammonia by itself and through assimilation exerts repression control on NiR and NR respectively, which are otherwise derepressed. © 1990 Federation of European Microbiological Societies.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free