Related Experiment Videos
In-vitro interaction between nitrofurantoin and Vibrio cholerae DNA
1Biophysics Division, Saha Institute of Nuclear Physics, Calcutta, India.
Chemico-Biological Interactions
|March 1, 1992
Summary
Nitrofurantoin interacts with Vibrio cholerae DNA, suggesting intercalation as the binding mode. This interaction alters DNA structure and inhibits DNase activity, impacting DNA integrity.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Nitrofurantoin is an antibiotic used to treat urinary tract infections.
- Understanding its interaction with bacterial DNA is crucial for elucidating its mechanism of action.
Purpose of the Study:
- To investigate the in-vitro interaction between nitrofurantoin and Vibrio cholerae DNA.
- To characterize the binding mode, affinity, and effects on DNA structure and function.
Main Methods:
- UV-Vis spectroscopy to monitor spectral changes upon binding.
- Scatchard analysis to quantify binding constants and sites.
- Viscosity measurements to determine the mode of DNA binding (intercalation).
- Thermal melting studies to assess DNA stability.
- DNase inhibition assays to evaluate functional impact.
Main Results:
- Nitrofurantoin binding caused spectral shifts and indicated complex binding interactions.
- Strongest binding affinity (k = 5.04 x 10^6 M-1) and low site number (n = 0.015) were observed.
- Viscosity and helix unwinding angle (10 degrees) supported DNA intercalation.
- Increased DNA melting temperature (Tm) by 6°C and DNase inhibition were noted.
Conclusions:
- Nitrofurantoin binds to Vibrio cholerae DNA via intercalation.
- The interaction stabilizes DNA and inhibits enzymatic degradation.
- These findings provide insights into nitrofurantoin's molecular mechanism against bacteria.