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Nucleic Acids Research, 1977, Vol. 4, No. 4 1083-1096
© 1977

Articles

Preliminary morphological and X-ray diffraction studies of the crystals of the DNA cetyltrimethylammonium salt

V.D. Osicaa, T.L. Pyatigorskayaa, O.F. Polyvtsevb, A.T. Demboc, M.O. KIiyac, V.N. Vasilchenkoa, B.I. Verkina and B.Ya. Sukharevskva

aPhys.-tech. Inst.Low Temps.Acad.Sci.Ukr.SSR Kharkov bInst.Biophys.,Acad.Sci. USSR Puschino-on-Oka cInst.Crystallogr.,Acad.Sci.USSR Moscow, USSR

Received March 7, 1977. Double-stranded DNA molecules (molecular weight 2.5x105 – 5x105 dal-tons) have been crystallized from water-salt solutions as cetyltrimethyl-aoBonium salts (CTA-DNA). Variation of crystallization conditions results in a production of different types of CTA-DNA crystals: spherulites, den-drites, needle-shaped and faceted rhombic crystals, the latter beeing up to 0. 3 an on a side. X-ray diffraction data indicate that DNA molecules in the crystals form a hexagonal lattice which parameters vary slightly with the morphological type of the crystal. Comparison of the melting curves of the DNA preparation before and after crystallization suggests that DNA molecules are partially fractionated in the course of crystallization. Crystals of the CTA-DNA-proflavine complex have also been obtained.


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