Clicked polycyclic aromatic hydrocarbon as a hybridization-responsive fluorescent artificial nucleobase in pyrrolidinyl peptide nucleic acids |
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Authors: | Woraluk Mansawat Chalothorn Boonlua Khatcharin Siriwong Tirayut Vilaivan |
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Institution: | 1. Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok 10330, Thailand;2. Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand |
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Abstract: | Pyrene as well as other aromatic hydrocarbons could be successfully incorporated into pyrrolidinyl peptide nucleic acid bearing a d-prolyl-2-aminocyclopentane carboxylic acid backbone (acpcPNA) as a base surrogate via a triazole linker employing Cu-catalyzed alkyne–azide cycloaddition (click chemistry). The labeling can be performed via a pre-clicked pyrene monomer or by post-synthetic modification of azide-containing acpcPNA on solid support. Thermal denaturation experiments suggested that the pyrene–triazole unit can behave as a universal base in the acpcPNA system. The mode of base-pairing has been proposed based on molecular dynamics simulations. Importantly, the fluorescence spectra of the pyrene-labeled single stranded acpcPNA and its hybrid with DNA are quite different. The ratio of emissions at 380 and 460 nm changed significantly (up to a factor of 7) upon hybrid formation with complementary DNA. |
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