The Aspergillus Nidulans xprG (phoG) Gene Encodes a Putative Transcriptional Activator Involved in the Response to Nutrient Limitation

Fungal Genet Biol. 2006 Mar;43(3):190-9. doi: 10.1016/j.fgb.2005.12.001. Epub 2006 Feb 7.

Abstract

The Aspergillus nidulans xprG gene is involved in the regulation of extracellular proteases. A plasmid which complemented the xprG2 mutation was shown to carry the phoG gene, reported to encode an acid phosphatase. Two phoGDelta mutants were constructed and were identical in phenotype to an xprG2 mutant. Null mutants were unable to use protein as a carbon or nitrogen source, have lost a repressible acid phosphatase and have pale conidial color. XprG shows similarity to the Ndt80 transcriptional activator, which regulates the expression of genes during meiosis in Saccharomyces cerevisiae. The xprG1 gain-of-function mutant contains a missense mutation in the region encoding the putative DNA-binding domain. The response to carbon, nitrogen, sulfur, and phosphate limitation is altered in xprG(-) mutants suggesting that XprG is involved in a general response to starvation. Ndt80 may also be involved in sensing nutritional status and control of commitment to meiosis in S. cerevisiae.

MeSH terms

  • Adaptation, Physiological*
  • Aspergillus nidulans / genetics*
  • Aspergillus nidulans / physiology
  • Base Sequence
  • DNA, Fungal / chemistry
  • DNA, Fungal / genetics
  • DNA-Binding Proteins / genetics
  • Fungal Proteins / chemistry
  • Fungal Proteins / genetics
  • Fungal Proteins / physiology
  • Gene Deletion
  • Gene Library
  • Genetic Complementation Test
  • Molecular Sequence Data
  • Mutagenesis, Insertional
  • Mutation, Missense
  • Phosphoric Monoester Hydrolases / analysis
  • Phosphoric Monoester Hydrolases / genetics
  • Pigmentation / genetics
  • Plasmids / genetics
  • Protein Structure, Tertiary / genetics
  • Proteins / metabolism
  • Saccharomyces cerevisiae Proteins / genetics
  • Sequence Homology, Amino Acid
  • Trans-Activators / chemistry
  • Trans-Activators / genetics*
  • Trans-Activators / physiology*
  • Transcription Factors / genetics

Substances

  • DNA, Fungal
  • DNA-Binding Proteins
  • Fungal Proteins
  • NDT80 protein, S cerevisiae
  • Proteins
  • Saccharomyces cerevisiae Proteins
  • Trans-Activators
  • Transcription Factors
  • Phosphoric Monoester Hydrolases