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[Effect of administration of alpha-amanitine on Mn2+ - dependent poly-A-polymerase in rat liver nuclei]
L'Ateneo Parmense. Acta Bio-Medica : Organo Della Societa Di Medicina E Scienze Naturali Di Parma
|January 1, 1979
Abstract:
Mn2+-dependent poly(A) polymerase activity tested in isolated rat liver nuclei is unchanged both in the absence and presence of exogenous poly(A) 30 min. after administration of a dose of alpha-amanitin that inhibits DNA-dependent RNA polymerase B. Longer times of treatment cause poly(A) polymerase to drop to 50% in the absence of poly(A) and to increase almost twice in its presence.
Insights
Poly(A) polymerase activity in rat liver nuclei is initially unaffected by alpha-amanitin. However, prolonged exposure to alpha-amanitin alters poly(A) polymerase activity, depending on the presence of poly(A).
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Context:
- Investigating the effects of alpha-amanitin on nuclear enzyme activity.
- Examining the role of manganese (Mn2+) in poly(A) polymerase function.
- Utilizing isolated rat liver nuclei as an experimental model.
Purpose:
- To determine the immediate and time-dependent effects of alpha-amanitin on poly(A) polymerase activity.
- To assess the influence of exogenous poly(A) on these effects.
- To differentiate the impact on DNA-dependent RNA polymerase B versus poly(A) polymerase.
Summary:
- Mn2+-dependent poly(A) polymerase activity in isolated rat liver nuclei remains unchanged 30 minutes after alpha-amanitin administration, even when inhibiting DNA-dependent RNA polymerase B.
- Longer treatment times with alpha-amanitin lead to a 50% decrease in poly(A) polymerase activity in the absence of exogenous poly(A).
- Conversely, prolonged alpha-amanitin exposure results in a nearly twofold increase in poly(A) polymerase activity in the presence of exogenous poly(A).
Impact:
- Provides insights into the distinct regulatory mechanisms of different RNA polymerases.
- Highlights the complex, time-dependent modulation of poly(A) polymerase by alpha-amanitin.
- Suggests differential responses of poly(A) polymerase based on substrate availability under toxic conditions.