3p4j

Publication Abstract from PubMed

The crystal structure of a Z-DNA hexamer duplex d(CGCGCG)(2) determined at ultra high resolution of 0.55 A and refined without restraints, displays a high degree of regularity and rigidity in its stereochemistry, in contrast to the more flexible B-DNA duplexes. The estimations of standard uncertainties of all individually refined parameters, obtained by full-matrix least-squares optimization, are comparable with values that are typical for small-molecule crystallography. The Z-DNA model generated with ultra high-resolution diffraction data can be used to revise the stereochemical restraints applied in lower resolution refinements. Detailed comparisons of the stereochemical library values with the present accurate Z-DNA parameters, shows in general a good agreement, but also reveals significant discrepancies in the description of guanine-sugar valence angles and in the geometry of the phosphate groups.

High regularity of Z-DNA revealed by ultra high-resolution crystal structure at 0.55 A.,Brzezinski K, Brzuszkiewicz A, Dauter M, Kubicki M, Jaskolski M, Dauter Z Nucleic Acids Res. 2011 Aug 1;39(14):6238-48. Epub 2011 Apr 1. PMID:21459852^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.