negative regulation of DNA-templated transcription catabolite repression nitrogen catabolite regulation of transcription nitrogen catabolite repression of transcription 2010-02-24T02:31:53Z tb A transcription regulation process in which the presence of one nitrogen source leads to a decrease in the frequency, rate, or extent of transcription of specific genes involved in the metabolism of other nitrogen sources. negative regulation of transcription by nitrogen catabolites nitrogen catabolite repression GO:0090295 biological_process