Mechanism of the inhibition of transcription by pr toxin, a mycotoxin from penicillium roqueforti
Abstract
PR toxin, a mycotoxin synthesized by Pénicillium roqueforti impairs the transcriptional process in liver cells; the two main RNA polymerase systems (enzymes A and B) are affected by PR toxin. The toxin does not require an enzymic conversion before interfering with in vitro RNA synthesis. Addition of ammonium sulphate completely prevents the inhibition of transcription by PR toxin. In vitro results, using RNA polymerase purified from E. coli, suggest that PR toxin impairs the activity of the RNA polymerase itself. Regarding the step of the transcription process affected, it is shown that PR toxin inhibits both initiation and elongation of the polynucleotide chain.
- Publication:
-
Chemico-Biological Interactions
- Pub Date:
- 1976
- DOI:
- 10.1016/0009-2797(76)90101-0
- Bibcode:
- 1976CBI....14..207M
- Keywords:
-
- DMSO;
- dimethylsulfoxide