title: RNA guanine quadruplex invasion by complementary and homologous PNA probes.
abstract: Guanine quadruplexes are gaining increasing attention due to their suspected roles in regulating gene expression at the transcriptional and translational levels. This paper describes the ability of short peptide nucleic acid (PNA) probes to disrupt a stable RNA quadruplex and hybridize to their target sequence. In one case, the PNA probe is complementary to the target, resulting in formation of a Watson-Crick base-paired duplex. In the second case, the PNA probe is homologous to the target and forms a hybrid quadruplex structure. The hybrid duplex is formed in a 1:1 stoichiometry, as expected based on the constraints imposed by Watson-Crick pairing. However, the hybrid quadruplex is formed in a PNA2:RNA stoichiometry, due to the ability of the short PNA to hybridize with both halves of the original RNA quadruplex.
authors.affiliation: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: Violeta L
authors.initials: VL
authors.lastname: Marin
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Armitage
mesh_terms: D001483:Base Sequence; D006147:Guanine / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D009693:Nucleic Acid Hybridization; D015345:Oligonucleotide Probes / Q000737:chemistry*; D020135:Peptide Nucleic Acids / Q000737:chemistry*; D012313:RNA / Q000737:chemistry*
chemical_list: D015345:Oligonucleotide Probes; D020135:Peptide Nucleic Acids; D006147:Guanine; D012313:RNA