High-Fidelity Sequence-Selective Duplex Formation by Recognition-Encoded Melamine Oligomers.

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Troselj, Pavle 
Bolgar, Peter 
Hunter, Christopher A  ORCID logo  https://orcid.org/0000-0002-5182-1859

Melamine oligomers composed of repeating triazine-piperidine units and equipped with phenol and phosphine oxide side-chains form H-bonded duplexes. The melamine backbone provides sufficient rigidity to prevent intramolecular folding of oligomers up to three recognition units in length, leading to reliable duplex formation between sequence complementary oligomers. NMR spectroscopy and isothermal titration calorimetry (ITC) were used to characterize the self-assembly properties of the oligomers. For length-complementary homo-oligomers, duplex formation in toluene is characterized by an increase in stability of an order of magnitude for every base-pair added to the chain. NMR spectra of dilute solutions of the AD 2-mer show that intramolecular H-bonding between neighboring recognition units on the chain (1,2-folding) does not occur. NMR spectra of dilute solutions of both the AAD and the ADD 3-mer show that 1,3-folding does not take place either. ITC was used to characterize interactions between all pairwise combinations of the six different 3-mer sequences, and the sequence complementary duplexes are approximately an order of magnitude more stable than duplexes with a single base mismatch. High-fidelity duplex formation combined with the synthetic accessibility of the monomer building blocks makes these systems attractive targets for further investigation.

3403 Macromolecular and Materials Chemistry, 3405 Organic Chemistry, 34 Chemical Sciences
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J Am Chem Soc
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American Chemical Society (ACS)
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European Research Council (320539)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (656902)
European Research Council for grant ERC-2012-AdG 320539-duplex, Marie Skłodowska-Curie Actions for Individual Fellow- ship H2020-MSCA-IF-2014 656902, and the Herchel Smith Fund