Selection of 2'-deoxy-2'-fluoroarabinonucleotide (FANA) Aptamers That Bind HIV-1 Reverse Transcriptase with Picomolar Affinity

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2015 Oct 18

PMID 26476448

Citations 45

Authors

Irani Alves Ferreira-Bravo

Christopher Cozens

Philipp Holliger

Jeffrey J DeStefano

Affiliations

Soon will be listed here.

Abstract

Using a Systematic Evolution of Ligands by Exponential Enrichment (SELEX) protocol capable of selecting xeno-nucleic acid (XNA) aptamers, a 2'-deoxy-2'-fluoroarabinonucleotide (FANA) aptamer (referred to as FA1) to HIV-1 reverse transcriptase (HIV-1 RT) was selected. FA1 bound HIV-1 RT with KD,app values in the low pM range under different ionic conditions. Comparisons to published HIV-1 RT RNA and DNA aptamers indicated that FA1 bound at least as well as these aptamers. FA1 contained a 20 nucleotide 5' DNA sequence followed by a 57 nucleotide region of FANA nucleotides. Removal of the fourteen 5' DNA nucleotides did not affect binding. FA1's predicted structure was composed of four stems and four loops. All stem nucleotides could be modified to G-C base pairs (14 total changes) with a small effect on binding. Eliminating or altering most loop sequences reduced or abolished tight binding. Overall, results suggested that the structure and the sequence of FA1 were important for binding. FA1 showed strong inhibition of HIV-1 RT in extension assays while no specific binding to avian myeloblastosis or Moloney murine leukemia RTs was detected. A complete DNA version of FA1 showed low binding to HIV-1 RT, emphasizing the unique properties of FANA in HIV-1 RT binding.

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