ArticleMethods in molecular biology (Clifton, N.J.)2021
Constraining TAT Peptide by γPNA Hairpin for Enhanced Cellular Delivery of Biomolecules.
Article in Methods in molecular biology (Clifton, N.J.), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Based on the exceptionally high stability of γPNA (Gamma-modified peptide nucleic acid) duplexes, we designed a peptide/γPNA chimera in which a cell-penetrating TAT (HIV Tat-derived) peptide is flanked by two short complementary γPNA segments. Intramolecular hybridization of the γPNA segments results in a stable hairpin conformation in which the TAT peptide is constrained to form the loop. The TAT/γPNA hairpin (self-cyclized TAT peptide) enters cells at least tenfold more efficiently than its nonhairpin analog in which the two γPNA segments are noncomplementary. Extending one of the γPNA segments in the hairpin results in an overhang that can be used for binding and delivering a variety of nucleic acid-conjugated molecules into cells via hybridization to the overhang. We demonstrated efficient cellular delivery of an anti-telomerase γPNA that specifically reduced telomerase activity of A549 cells by over 97%.
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