The Effect of Methylation of the 6 Oxygen of Guanine on the Structure and Stability of Double Helical DNA
- 1 August 1985
- journal article
- research article
- Published by Taylor & Francis in Journal of Biomolecular Structure and Dynamics
- Vol. 3 (1) , 57-66
- https://doi.org/10.1080/07391102.1985.10508398
Abstract
The effect of methylation of the 0–6 position of guanine in short segments of double helical DNA has been investigated by molecular mechanical simulations on the sequences d(CGCGCG)2, d(CGC+AFs-OMG+AF0-CG)2, d(CGT+AFs-OMG+AF0-CG)2, d(CGC+AFs-OMC+AF0-CG/(CGCGCG), d(CGC+AFs-OMG+AF0-CG/d(CGTGCG), d(CGCGAATTCGCG)2 and d(CGCGAATTC+AFs-OMG+AF0-CG)2. Guanines methylated at the 0–6 position are found to form hydrogen bonds of roughly equal strength to cytosine and thymine. The optimum structure of these modified base pairs are not dramatically different from normal GC pairs, but both involve some bifurcation of the proton donors of cytosine (4NH2) or thymine (3NH) between the guanine N3 and O6 groups.This publication has 9 references indexed in Scilit:
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