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Interaction of amphiphilic cyclic peptide with double and triple stranded DNA
1Department of Chemistry, Kyushu School of Engineering, Kinki University, Fukuoka, Japan.
Nucleic Acids Symposium Series
|April 26, 2000
Abstract:
It was found that Gramicidin S (GS) with intramolecular antiparallel beta-sheet structure could bind to and thermally stabilize double and triple stranded DNA. UV melting study revealed that GS stabilized mixed sequence dsDNA in the presence of Mg2+ (deltaTm = +6.0) but it stabilized dsDNA with homosequence only in the absence of Mg2+. It should be pointed out that GS specifically stabilized the third strand (Hoogsteen base pair) but not double strand (Watson-Crick base pair) in triple helix DNA.