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Structural Investigations on the Anti‐HIV G‐Quadruplex‐Forming Oligonucleotide TGGGAG and Its Analogues: Evidence for the Presence of an A‐Tetrad
Author(s) -
Virgilio Antonella,
Esposito Veronica,
Citarella Giuseppe,
Mayol Luciano,
Galeone Aldo
Publication year - 2012
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.201200481
Subject(s) - tetrad , aptamer , oligonucleotide , g quadruplex , dna , chemistry , deoxyguanosine , thymine , human immunodeficiency virus (hiv) , stereochemistry , nuclear magnetic resonance spectroscopy , computational biology , base pair , combinatorial chemistry , biochemistry , biology , microbiology and biotechnology , genetics , virology
Several anti‐HIV aptamers adopt DNA quadruplex structures. Among these, “Hotoda's aptamer” (base sequence TGGGAG) was one of the first to be discovered. Although it has been the topic of some recent research, no detailed structural investigations have been reported. Here we report structural investigations on this aptamer and analogues with related sequences, by using UV, CD, and NMR spectroscopy as well as electrophoretic techniques. The addition of a 3′‐end thymine has allowed us to obtain a single, investigable quadruplex structure. Data clearly point to the presence of an A‐tetrad. Furthermore, the effects of the incorporation of an 8‐methyl‐2′‐deoxyguanosine at the 5′‐end of the G‐run were investigated.