PMID: 11607250Jan 15, 1992Paper

Regulation of assimilatory nitrate reductase activity in soil by microbial assimilation of ammonium

Proceedings of the National Academy of Sciences of the United States of America
G W McCarty, J M Bremner

Abstract

It is well established that assimilatory nitrate reductase (ANR) activity in soil is inhibited by ammonium (NH4+). To elucidate the mechanism of this inhibition, we studied the effect of L-methionine sulfoximine (MSX), an inhibitor of NH4+ assimilation by microorganisms, on assimilatory reduction of nitrate (NO3-) in aerated soil slurries treated with NH4+. We found that NH4+ strongly inhibited ANR activity in these slurries and that MSX eliminated this inhibition. We also found that MSX induced dissimilatory reduction of NO3- to NH4+ in soil and that the NH4+ thus formed had no effect on the rate of NO-3 reduction. We concluded from these observations that the inhibition of ANR activity by NH4+ is due not to NH4+ per se but to products formed by microbial assimilation of NH4+. This conclusion was supported by a study of the effects of early products of NH4+ assimilation (L amino acids) on ANR activity in soil, because this study showed that the biologically active, L isomers of glutamine and asparagine strongly inhibited ANR activity, whereas the D isomers of these amino acids had little effect on ANR activity. Evidence that ANR activity is regulated by the glutamine formed by NH4+ assimilation was provided by studies showing ...Continue Reading

Citations

Jul 1, 1992·Proceedings of the National Academy of Sciences of the United States of America·G W McCarty, J M Bremner
Sep 7, 2014·Environmental Monitoring and Assessment·Anna Piotrowska-Długosz, Edward Wilczewski
Sep 18, 2012·Chemosphere·Jiří JiroutDana Elhottová
Dec 5, 2017·Environmental Science and Pollution Research International·Zhenzhu ChenZuhong Lu

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