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Structure of d(CACGCG).d(CGCGTG) in crystals grown in the presence of ruthenium III hexammine chloride.

作者信息

Karthe P, Gautham N

机构信息

Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.

出版信息

Acta Crystallogr D Biol Crystallogr. 1998 Jul 1;54(Pt 4):501-9. doi: 10.1107/s0907444997013954.

DOI:10.1107/s0907444997013954
PMID:9761846
Abstract

Hexammine ions are strong inducers of the transition from the B-form to the left-handed Z-form in DNA. Here the structure of d(CACGCG). d(CGCGTG) obtained from crystals grown from a drop containing [Ru(NH3)6]Cl3 is reported. The structure is clearly characterized as Z-DNA. When compared with the structure of d(CACGCG).d(CGCGTG)/MgCl2 and that of d(CGCGCG)2, subtle differences are seen, most noticeably in the water structure. Since stable well diffracting crystals grow easily in the presence of [Ru(NH3)6]Cl3 and since this ion is not visible in the electron density it is concluded that the ion plays a non-specific role in stabilizing Z-DNA.

摘要

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