The effect of crystal packing on oligonucleotide double helix structure.

Journal of Biomolecular Structure & Dynamics
R E DickersonP E Pjura

Abstract

One of the questions that constantly is asked regarding x-ray crystal structure analyses of macromolecules is: To what extent is the observed crystal structure representative of the molecular conformation when free in solution, and to what degree is the structure perturbed by intermolecular crystal forces? This can be assessed with DNA oligomers because of an unusual aspect of crystallization self-complementary oligomers should possess a twofold symmetry axis normal to their helix axis, yet more often than not crystal of such oligomers do not use this internal symmetry. The two ends of the helix are crystallographically distinct though chemically identical. Complexes of DNA oligomers with intercalating drugs such as triostin A tend to use their twofold symmetry when they crystallize, whereas complexes with non-intercalating, groove-binding drugs ignore this symmetry unless the drug molecule is very small. A detailed examination of crystal packing in the dodecamer C-G-C-G-A-A-T-T-C-G-C-G provides an explanation of all of the foregoing behavior in terms of the mechanism of nucleation of DNA or DNA-drug complexes on the surface of a growing crystal. Asymmetry of the ends of the DNA helix is the price that is paid for efficient lat...Continue Reading

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