Sequence-specific affinity precipitation of oligonucleotide using poly(N-isopropylacrylamide) - Oligonucleotide conjugate

Takeshi Mori, Daisuke Umeno, Mizuo Maeda*


研究成果: Article査読

28 被引用数 (Scopus)


In this study we develop a sequence-specific precipitation separation system of oligonucleotide (ODN) using a conjugate between poly(N-isopropylacrylamide) (PNIPAM) and ODN. PNIPAM is known as a thermoresponsive polymer and dehydrates to precipitate above its phase transition temperature in an aqueous milieu. The principal advantage of this separation system using the conjugate is that the hybridization reaction between the conjugate and oligonucleotide is conducted in homogeneous solution. The conjugate was prepared by copolymerization between N-isopropylacrylamide and a vinyl-derivatized (dT)8. The obtained conjugate efficiently precipitated (dA)8 from solution when the solution contained more than 1.5 M NaCl. The conjugate containing 3 nmol of (dT)8 residue was able to precipitate 1.4 nmol of (dA)8, suggesting that the (dT)8 residue of the conjugate formed a triple helix with (dA)8. From an equimolar mixture of (dA)8 and its one point mutant, the conjugate selectively precipitated (dA)8: the highest selectivity was obtained for the isolation of (dA)8 from the mixture consisting of (dA)4dT(dA)3 and (dA)8. When the conjugate was applied for the precipitation of five oligo(dA)s having different chain lengths, the longer oligo(dA)s tended to be precipitated by the conjugate more efficiently than the shorter ones. The conjugate could be used repeatedly for precipitation of (dA)8 without showing any loss in precipitation efficiency.

ジャーナルBiotechnology and bioengineering
出版ステータスPublished - 2001 2月 5

ASJC Scopus subject areas

  • バイオテクノロジー
  • バイオエンジニアリング
  • 応用微生物学とバイオテクノロジー


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