Terminal hairpin in oligonucleotide dominantly prioritizes intramolecular cyclization by T4 ligase over intermolecular polymerization: an exclusive methodology for producing ssDNA rings.

ABSTRACT: When oligonucleotide bearing a hairpin near either its 3'- or 5'-end was treated with T4 DNA ligase, the intramolecular cyclization dominantly proceeded and its monomeric cyclic ring was obtained in extremely high selectivity. The selectivity was hardly dependent on the concentration of the oligonucleotide, and thus it could be added in one portion to the mixture at the beginning of the reaction. Without the hairpin, however, the formation of polymeric byproducts was dominant under the same conditions. Hairpin-bearing oligonucleotides primarily take the folded form, and the enzymatically reactive species (its open form) is minimal. As the result, the intermolecular reactions are efficiently suppressed due to both thermodynamic and kinetic factors. The 'terminal hairpin strategy' was applic

SUBMITTER: Cui Y 

PROVIDER: S-EPMC6294566 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature