Seela F, Peng X. Base-modified oligodeoxyribonucleotides: using pyrrolo[2,3-d]pyrimidines to replace purines.
ACTA ACUST UNITED AC 2008;
Chapter 4:Unit 4.25. [PMID:
18428940 DOI:
10.1002/0471142700.nc0425s20]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Phosphoramidites are first synthesized from suitably protected 7-deazapurine 2'-deoxyribonuclosides that have halogen or alkynyl subsituents at the 7 position. Oligonucleotides containing 7-deazapurines (pyrrolo[2,3-d]pyrimidines) in place of the canonical nucleobases are then prepared by solid-phase synthesis. These oligonucleotides are subsequently allowed to hybridize, and the stabilities of the resulting duplexes are determined. Comparison of T(m) values indicates that the presence of 7-halo or 7-alkynyl substituents increases duplex stability relative to duplexes involving oligonucleotides that contain the corresponding parent purines.
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