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The effect of nitrofurantoin on deoxyribonucleic acid synthesis in plant mitochondria
Abstract:
Nitrofurantoin (1-([(5-nitrofuran-2-yl)methylene]amino)imidazolidine-2,4-dione), a widely used drug and also a well-known bacterial mutagen, inhibits DNA synthesis in mitochondria from 48 h etiolated seedlings of Vigna sinensis (Linn.) Savi (snake bean). The effect appears at the level of the uptake of radioactive deoxynucleoside triphosphates by the plant mitochondria. Nitrofurantoin does not inhibit DNA synthesis in vitro by homogeneous Escherichia coli DNA polymerase I and DNA polymerase from avian-myeloblastosis virus. No specific nitroreductase activity could be detected in mitochondria.
Insights
Nitrofurantoin inhibits mitochondrial DNA synthesis in snake bean seedlings by affecting deoxynucleoside triphosphate uptake. This bacterial mutagen does not impact bacterial DNA polymerases, suggesting a plant-specific mitochondrial mechanism.
Area of Science:
- Biochemistry
- Molecular Biology
- Plant Science
Background:
- Nitrofurantoin is a widely used antibiotic known for its antibacterial mutagenic properties.
- Plant mitochondria possess their own DNA and synthesis machinery, distinct from bacterial systems.
Purpose of the Study:
- To investigate the effect of nitrofurantoin on DNA synthesis in plant mitochondria.
- To determine the specific mechanism by which nitrofurantoin affects mitochondrial DNA synthesis in plants.
Main Methods:
- Utilizing 48-hour etiolated Vigna sinensis (snake bean) seedlings.
- Measuring the uptake of radioactive deoxynucleoside triphosphates by isolated plant mitochondria.
- Testing nitrofurantoin's inhibitory effects on purified bacterial (Escherichia coli) and viral DNA polymerases in vitro.
Main Results:
- Nitrofurantoin significantly inhibits DNA synthesis in Vigna sinensis mitochondria.
- The inhibition occurs at the level of deoxynucleoside triphosphate uptake by the mitochondria.
- Nitrofurantoin showed no inhibitory effect on DNA polymerase I from Escherichia coli or avian-myeloblastosis virus DNA polymerase.
- No detectable nitroreductase activity was found in the plant mitochondria.
Conclusions:
- Nitrofurantoin interferes with plant mitochondrial DNA synthesis, specifically impacting nucleotide precursor uptake.
- The mechanism of inhibition is likely specific to plant mitochondria and does not involve direct interaction with bacterial-like DNA polymerases or nitroreductase activity.
- This finding highlights a potential difference in how nitrofurantoin interacts with mitochondrial DNA synthesis in plants versus bacteria.