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URN: urn:nbn:de:swb:90-520089

Strand displacement and duplex invasion into double-stranded DNA by pyrrolidinyl peptide nucleic acids

Bohländer, P.R.; Vilaivan, T.; Wagenknecht, H.-A.

Abstract:
The so-called acpcPNA system bears a peptide backbone consisting of 4′-substituted proline units with (2′R,4′R) configuration in an alternating combination with (2S)-amino-cyclopentane-(1S)-carboxylic acids. acpcPNA forms exceptionally stable hybrids with complementary DNA. We demonstrate herein (i) strand displacements by single-stranded DNA from acpcPNA-DNA hybrids, and by acpcPNA strands from DNA duplexes, and (ii) strand invasions by acpcPNA into double-stranded DNA. These processes were studied in vitro using synthetic oligonucleotides and by means of our concept of wavelength-shifting fluorescent nucleic acid probes, including fluorescence lifetime measurements that allow quantifying energy transfer efficiencies. The strand displacements of preannealed 14mer acpcPNA-7mer DNA hybrids consecutively by 10mer and 14mer DNA strands occur with rather slow kinetics but yield high fluorescence color ratios (blue:yellow or blue:red), fluorescence intensity enhancements, and energy transfer efficiencies. Furthermore, 14mer acpcPNA strands are able to invade into 30mer double-stranded DNA, remarkably with quantitative efficiency in all s ... mehr


Zugehörige Institution(en) am KIT Institut für Organische Chemie (IOC)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1477-0520
KITopen ID: 1000052008
Erschienen in Organic and Biomolecular Chemistry
Band 13
Heft 35
Seiten 9223-9230
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