title: Acceleration of DNA strand exchange by polycation comb-type copolymer.
abstract: The accelerating effect of cationic substances on DNA strand exchange reaction between 20 bp DNA duplex and its complementary single strand was studied. A comb-type polycationic copolymer which is composed of poly (L-lysine) backbone and dextran graft chain (PLL-g-Dex) and known to stabilize triplex DNA expedites the strand exchange reaction under physiological relevant conditions. Electrostatically small excess of the copolymer increased DNA strand exchange rate by 300-fold while large excess of spermine or cethyltrimethylammonium bromide, cationic detergent known to promote markedly hybridization of complementary DNA strands, showed slight effect. It should be noted that the copolymer promotes the strand exchange reaction while it stabilizes double stranded DNA.
authors.affiliation: Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8501, Japan.
authors.forename: W J
authors.initials: WJ
authors.lastname: Kim
authors.forename: T
authors.initials: T
authors.lastname: Ishihara
authors.forename: T
authors.initials: T
authors.lastname: Akaike
authors.forename: A
authors.initials: A
authors.lastname: Maruyama
mesh_terms: D000818:Animals; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000494:pharmacology; D004247:DNA / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism*; D004260:DNA Repair / Q000187:drug effects*; D003911:Dextrans / Q000494:pharmacology*; D066298:In Vitro Techniques; D007700:Kinetics; D009838:Oligodeoxyribonucleotides / Q000737:chemistry / Q000378:metabolism; D011073:Polyamines / Q000494:pharmacology; D000071228:Polyelectrolytes; D011107:Polylysine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D013096:Spermine / Q000494:pharmacology; D055672:Static Electricity
chemical_list: D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D004247:DNA; D003911:Dextrans; D009838:Oligodeoxyribonucleotides; D011073:Polyamines; D000071228:Polyelectrolytes; D011107:Polylysine; D013096:Spermine; C113090:poly(lysine)-graft-dextran