μABC: a systematic microsecond molecular dynamics study of tetranucleotide sequence effects in B-DNA.

TitleμABC: a systematic microsecond molecular dynamics study of tetranucleotide sequence effects in B-DNA.
Publication TypeJournal Article
Year of Publication2014
AuthorsPasi, Marco, Maddocks John H., Beveridge David, Bishop Thomas C., Case David A., Cheatham Thomas, Dans Pablo D., Jayaram B, Lankaš Filip, Laughton Charles, Mitchell Jonathan, Osman Roman, Orozco Modesto, Pérez Alberto, ciute Daiva Petkevi\v, Spackova Nada, Sponer Jiri, Zakrzewska Krystyna, and Lavery Richard
JournalNucleic Acids Res
Volume42
Pagination12272-83
Date Published2014 Oct 29
ISSN1362-4962
KeywordsB-Form, Base Pairing, Base Sequence, DNA, Molecular Dynamics Simulation, Nucleic Acid Conformation
Abstract

We present the results of microsecond molecular dynamics simulations carried out by the ABC group of laboratories on a set of B-DNA oligomers containing the 136 distinct tetranucleotide base sequences. We demonstrate that the resulting trajectories have extensively sampled the conformational space accessible to B-DNA at room temperature. We confirm that base sequence effects depend strongly not only on the specific base pair step, but also on the specific base pairs that flank each step. Beyond sequence effects on average helical parameters and conformational fluctuations, we also identify tetranucleotide sequences that oscillate between several distinct conformational substates. By analyzing the conformation of the phosphodiester backbones, it is possible to understand for which sequences these substates will arise, and what impact they will have on specific helical parameters.

DOI10.1093/nar/gku855
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