Study of DNA-spermine interactions by use of small-angle and wide-angle X-ray scattering and circular dichroism.
Circular dichroism measurements with DNA-spermine complexes at 0.075 M NaCl and at 0.15 M NaCl reveal +psi (type I) and -psi (type II) CD spectra respectively. From small-angle X-ray scattering studies it could be shown that type I has a long-range order, short-range order supramolecular structure, while type II is of long-range disorder, short-range disorder structure. The secondary structure of the DNA in both types of condensates is B-like as concluded from wide-angle X-ray scattering diagrams of the condensates and from a comparison with the wide-angle X-ray curves of DNA and RNA in solution.
D000818:Animals; D002417:Cattle; D002942:Circular Dichroism; D004247:DNA; D009690:Nucleic Acid Conformation; D012313:RNA; D012542:Scattering, Radiation; D013096:Spermine; D014965:X-Rays
D013096:Spermine; D012313:RNA; D004247:DNA