Issue 12, 2017

Evolved polymerases facilitate selection of fully 2′-OMe-modified aptamers

Abstract

RNA or DNA aptamers with 2′-OMe-modifications have been pursued to increase resistance to nucleases, but have been difficult to identify because the OMe groups ablate polymerase recognition. We recently reported evolution of the thermostable DNA polymerases SFM4-6 and SFM4-9, which enable the efficient “transcription” and “reverse transcription”, respectively, of 2′-OMe oligonucleotides. With these polymerases, we now report the first selection of fully 2′-OMe modified aptamers, specifically aptamers that bind human neutrophil elastase (HNE). Two aptamers, 2mHNE-1 and 2mHNE-2, were isolated after five rounds of selection, and four more, 2mHNE-3–6, after an additional five rounds that included selection pressure for binding in the presence of serum. All six aptamers bind with reasonable affinity, which requires the 2′-OMe substituents. Further characterization of one aptamer, 2mHNE-5, showed that unlike a previously reported natural anti-HNE aptamer, affinity for HNE is retained in the presence of high concentrations of salt or serum. The polymerases SFM4-6 and SFM4-9 should prove valuable for the production and further exploration of modified aptamers.

Graphical abstract: Evolved polymerases facilitate selection of fully 2′-OMe-modified aptamers

Supplementary files

Article information

Article type
Edge Article
Submitted
26 Aug. 2017
Accepted
04 Okt. 2017
First published
16 Okt. 2017
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2017,8, 8179-8182

Evolved polymerases facilitate selection of fully 2′-OMe-modified aptamers

Z. Liu, T. Chen and F. E. Romesberg, Chem. Sci., 2017, 8, 8179 DOI: 10.1039/C7SC03747C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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