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Silver assisted stereo-directed assembly of branched peptide nucleic acids into four-point nanostars

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Abstract

Branched chiral peptide nucleic acids br(4S/R)-PNA with three arms of PNA-C4 strands were constructed on a central chiral core of 4(R/S)-aminoproline as the branching center. The addition of Ag+ triggered the self-assembly of branched PNAs through the formation of C–Ag+–C metallo base pairing of the three PNA C4 arms leading to non-covalent dendrimers, whose architecture is directed by the C4(R/S)-stereocenter of core 4-aminoproline. The 4S-aminoprolyl core enabled the precise formation of four-pointed nanostars that was not realised with 4R-aminoprolyl or acyclic, achiral aminoethyl glycyl PNA cores. The dendritic assembly of 4 pointed nanostars exhibited net chirality of base stacks in CD spectra, while the base stack assembly from br(4R)-PNA 2 was overall achiral. The results demonstrate that the silver assisted, 4S-aminoproline core stereo selective chiral assembly of branched PNAs manifests into nanostar morphology. The chiral branched PNAs open new vistas in the supramolecular organization of nucleic acids.

Graphical abstract: Silver assisted stereo-directed assembly of branched peptide nucleic acids into four-point nanostars

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Article information


Submitted
22 Jul 2020
Accepted
29 Sep 2020
First published
30 Sep 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Silver assisted stereo-directed assembly of branched peptide nucleic acids into four-point nanostars

B. R. Madhanagopal, J. Kumar and K. N. Ganesh, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR05471B

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