Molecular structure of (m5 dC-dG)3: the role of the methyl group on 5-methyl cytosine in stabilizing Z-DNA.

Abstract:

:The hexamer (m5 dC-dG)3 has been synthesized and its three-dimensional structure determined by a single crystal X-ray diffraction analysis. The structure has been refined to a final R value of 15.6% at 1.3 A resolution. The molecule forms a left-handed Z-DNA helix which is similar to the unmethylated Z-DNA structure. The presence of the methyl group has resulted in slight changes in the twist angle between successive base pairs and modification of some of the interatomic contacts. Methylation of cytosine in the C5 position is associated with a relative destabilization of the B-DNA structure and a stabilization through hydrophobic bonding of the Z-DNA structure.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Fujii S,Wang AH,van der Marel G,van Boom JH,Rich A

doi

10.1093/nar/10.23.7879

subject

Has Abstract

pub_date

1982-12-11 00:00:00

pages

7879-92

issue

23

eissn

0305-1048

issn

1362-4962

journal_volume

10

pub_type

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