Characterization of an Nmr Homolog That Modulates GATA Factor-Mediated Nitrogen Metabolite Repression in Cryptococcus neoformans

  title={Characterization of an Nmr Homolog That Modulates GATA Factor-Mediated Nitrogen Metabolite Repression in Cryptococcus neoformans},
  author={I. Russel Lee and Jonathan Wei Chuen Lim and Kate L Ormerod and Carl A. Morrow and James Angus Fraser},
  journal={PLoS ONE},
Nitrogen source utilization plays a critical role in fungal development, secondary metabolite production and pathogenesis. In both the Ascomycota and Basidiomycota, GATA transcription factors globally activate the expression of catabolic enzyme-encoding genes required to degrade complex nitrogenous compounds. However, in the presence of preferred nitrogen sources such as ammonium, GATA factor activity is inhibited in some species through interaction with co-repressor Nmr proteins. This… 

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  • G. Marzluf
  • Biology
    Microbiology and molecular biology reviews : MMBR
  • 1997
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