Methylammonium resistance in Aspergillus nidulans.

  title={Methylammonium resistance in Aspergillus nidulans.},
  author={Herbert N. Arst and David J. Cove},
  journal={Journal of bacteriology},
  volume={98 3},
Mutants of Aspergillus nidulans resistant to methylammonium toxicity are simultaneously derepressed in the presence of ammonium for apparently all ammonium-repressible activities. Enzyme assays directly demonstrate derepression of nitrate, nitrite, and hydroxylamine reductases, xanthine dehydrogenase, urate oxidase, and allantoinase, whereas in vivo tests show that ammonium and methylammonium repression or inhibition (or both) is relieved in these mutants in pathways of nitrate assimilation… CONTINUE READING