title: Interaction of cationic alpha-helical peptide with phosphorothioate DNA hybrid.
abstract: Synthetic amphiphilic alpha-helix peptides were found to bind to stabilize double or triple stranded DNA. The stabilization effect was significant for cationic alpha-helix peptides which indicated the importance of electrostatic interaction of positive charge of peptide and negative charge of DNA. It should be also pointed out that hybrid double or triple helical complexes containing phosphorothioate oligonucleotide were stabilized to a larger extent respect to phosphodiester oligonucleotides. Since it was shown that cationic amphiphilic alpha-helix peptide accelerate membrane permeability of DNA, the present study can provide a solution for the problems of antisense or triplex oligonucleotide in their practical application.
authors.affiliation: Department of Chemistry, Kyushu School of Engineering, Kinki University, Fukuoka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kubo
authors.forename: M
authors.initials: M
authors.lastname: Fujii
mesh_terms: D000595:Amino Acid Sequence; D020029:Base Pairing; D001483:Base Sequence; D004247:DNA / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D009692:Nucleic Acid Heteroduplexes / Q000737:chemistry; D009838:Oligodeoxyribonucleotides / Q000737:chemistry*; D009843:Oligoribonucleotides / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D017433:Protein Structure, Secondary; D012313:RNA / Q000737:chemistry*; D018629:Spectrometry, Mass, Secondary Ion; D013873:Thionucleotides
chemical_list: D009692:Nucleic Acid Heteroduplexes; D009838:Oligodeoxyribonucleotides; D009843:Oligoribonucleotides; D010455:Peptides; D013873:Thionucleotides; D012313:RNA; D004247:DNA