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Nucleic Acids Research, 1978, Vol. 5, No. 10 3801-3810
© 1978

Articles

Study of DNA-spermine interactions by use of small-angle and wide-angle X-ray scattering and circular dichroism

Hilde Damaschun, G. Damaschun, M. Becker, E. Buder, R. Misselwitz and D. Zirwer

Central Institute of Molecular Biology, Academy of Sciences of GDR DDR-1115 Berlin-Buch, GDR

Received July 31, 1978. 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.


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