Abstract
Highly fluorescent and thermo-stable peptide nanoribbons (PNRs) were fabricated by solvothermal selfassembly of a single peptide (d,d-diphenyl alanine peptides) with Sn-porphyrin (trans-dihydroxo- [5,10,15,20-tetrakis(p-tolyl)porphyrinato] Sn(IV) (SnTTP(OH)2)). The structural characterization of the asprepared nanoribbons was performed by transmitting electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM), FT-IR and Raman spectroscopy, indicating that the lipophilic Sn-porphyrins are impregnated into the porous surface formed in the process of nanoribbon formation through intermolecular hydrogen bonding of the peptide main chains. Consequently the Snporphyrin- impregnated peptide nanoribbons (Sn-porphyrin-PNRs) exhibited typical UV-visible absorption spectrum of the monomer porphyrin with a red shifted Q-band, and their fluorescence quantum yield was observed to be enhanced compared to that of free Sn-porphyrin. Interestingly the fluorescence intensity and lifetimes of Sn-porphyrin-PNRs were selectively affected upon interaction with nucleotide base sequences of DNA while those of free Sn-porphyrins were not affected by binding with any of the DNA studied, indicating that DNA-induced changes in the fluorescence properties of Sn-porphyrin-PNRs are due to interaction between DNA and the PNR scaffold. These results imply that Sn-porphyrin-PNR will be useful as a potent fluorescent protein analogue and as a biocompatible DNA sensor.
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Parayil, S.K., Lee, J. & Yoon, M. Highly fluorescent peptide nanoribbon impregnated with Sn-porphyrin as a potent DNA sensor. Photochem Photobiol Sci 12, 798–804 (2013). https://doi.org/10.1039/c3pp25337f
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DOI: https://doi.org/10.1039/c3pp25337f