The use of phosphorothioate-modified DNA in restriction enzyme reactions to prepare nicked DNA
- PMID: 3001649
- PMCID: PMC318949
- DOI: 10.1093/nar/13.24.8749
The use of phosphorothioate-modified DNA in restriction enzyme reactions to prepare nicked DNA
Abstract
The RF IV form of M13 DNA was synthesized enzymatically in vitro, using the viral (+)strand as template, to contain phosphorothioate-modified internucleotidic linkages of the Rp configuration on the 5' side of every base of a particular type in the newly-synthesized (-)strand. Twenty nine restriction enzymes were then tested for their reactions with the appropriate modified DNA types having a phosphorothioate linkage placed exactly at the cleavage site(s) of these enzymes in the (-)strand. Eleven of the seventeen restriction enzymes tested that had recognition sequences of five bases or more could be used to convert the phosphorothioate DNA entirely into the nicked form, either by simply allowing the reaction to go to completion with excess enzyme (Ava I, Ava II, Ban II, Hind II, Nci I, Pst I or Pvu I) or by stopping the reaction at the appropriate time before the nicked DNA is linearized (Bam HI, Bgl I, Eco RI or Hind III). Only modification of the exact cleavage site in the (-)strand could block linearization by the first class of enzymes. The results presented imply that the restriction enzyme-directed nicking of phosphorothioate M13 DNA occurs exclusively in the (+)strand.
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