title: Multiple GATA sites: protein binding and physiological relevance for the regulation of the proline transporter gene of Aspergillus nidulans.
abstract: In Aspergillus nidulans, proline can serve both as a carbon and a nitrogen source. The transcription of the prnB gene, encoding the proline transporter, is efficiently repressed only by the simultaneous presence of ammonium and glucose. Thus, repression of this gene demands the activation of the CreA repressor and the inactivation of the positive-acting GATA factor AreA. Repression of all other prn structural genes results largely from inducer exclusion. In an areA null mutation background, prnB is repressible by the sole presence of glucose. We have determined by EMSA and missing-base interference experiments that there are 15 AreA-binding sites in the prnD-prnB intergenic region. Only sites 13/14, in the proximity of the prnB TATA box, are clearly involved in transcriptional activation and regulation. Mutation of these sites mimics qualitatively the regulatory effect of an areA null mutation. The deletion of the TATA box has a measurable effect on the maximal level of prnB transcription but does not alter the regulation pattern of this gene.
mesh_terms: D026921:Amino Acid Transport Systems, Neutral / Q000235:genetics* / Q000378:metabolism; D001233:Aspergillus nidulans / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D004252:DNA Mutational Analysis; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D021901:DNA, Intergenic; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal / Q000235:genetics; D005947:Glucose / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D010088:Oxidoreductases / Q000235:genetics; D011392:Proline / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D000644:Quaternary Ammonium Compounds / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D017384:Sequence Deletion; D016385:TATA Box / Q000502:physiology; D035181:TATA-Box Binding Protein / Q000378:metabolism; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D026921:Amino Acid Transport Systems, Neutral; C079728:AreA protein, Aspergillus nidulans; D004271:DNA, Fungal; D021901:DNA, Intergenic; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C113261:PrnA protein, Aspergillus nidulans; D000644:Quaternary Ammonium Compounds; D012097:Repressor Proteins; D035181:TATA-Box Binding Protein; D015534:Trans-Activators; D014157:Transcription Factors; C071237:CreA protein, Aspergillus nidulans; C033082:proline transporter; D011392:Proline; D010088:Oxidoreductases; C407364:monodechloroaminopyrrolnitrin halogenase; D005947:Glucose