title: DNA interaction studies of an antiviral drug, ribavirin, using different instrumental methods.
abstract: Interaction of ribavirin with CT-DNA was investigated by emission, absorption, circular dichroism, and viscosity studies to determine the binding mode and binding constant of this drug with DNA. The calculated binding constant, K(b), obtained from UV-vis absorption studies was 4.6 × 10(3) M(-1). In fluorimetric studies, the enthalpy (ΔH<0) and entropy (ΔS>0) of the reaction between ribavirin and CT-DNA showed a hydrophobic interaction. In addition, in the circular dichroism spectrum, the drug induces a B → A structural transition of CT-DNA. These results demonstrate that ribavirin interacts with CT-DNA via the groove binding mode. It was observed that the drug has ability to cleave supercoiled plasmid DNA.
authors.affiliation: Department of Chemistry, Faculty of Science, Razi University, Kermanshah, Iran. nahidshahabadi@yahoo.com
authors.forename: Nahid
authors.initials: N
authors.lastname: Shahabadi
authors.forename: Zeinab Mirzaei
authors.initials: ZM
authors.lastname: Kalar
authors.forename: Asad Veysi
authors.initials: AV
authors.lastname: Rayegani
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000737:chemistry / Q000378:metabolism*; D002417:Cattle; D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D019277:Entropy; D015394:Molecular Structure; D012254:Ribavirin / Q000737:chemistry / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D000998:Antiviral Agents; D012254:Ribavirin; D004247:DNA; C427203:calf thymus DNA