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Nucleic Acids Research, Vol 27, Issue 17 3466-3473, Copyright © 1999 by Oxford University Press

ARTICLES

Aqueous trifluorethanol solutions simulate the environment of DNA in the crystalline state

J Kypr, J Chladkova, M Zimulova and M Vorlickova
Academy of Sciences of the Czech Republic, Institute of Biophysics, Kralovopolska 135, CZ-61265 Brno, Czech Republic.

We took 28 fragments of DNA whose crystal structures were known and used CD spectroscopy to search for conditions stabilising the crystal structures in solution. All 28 fragments switched into their crystal structures in 60-80% aqueous trifluorethanol (TFE) to indicate that the crystals affected the conformation of DNA like the concentrated TFE. The fragments crystallising in the B-form also underwent cooperative TFE-induced changes that took place within the wide family of B-form structures, suggesting that the aqueous and crystal B-forms differed as well. Spermine and magnesium or calcium cations, which were contained in the crystallisation buffers, promoted or suppressed the TFE-induced changes of several fragments to indicate that the crystallisation agents can decide which of the possible structures is adopted by the DNA fragment in the crystal.
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