5 years ago

Uracil-Amino Acid as a Scaffold for β-Sheet Peptidomimetics: Study of Photophysics and interaction with BSA Protein

Uracil-Amino Acid as a Scaffold for β-Sheet Peptidomimetics: Study of Photophysics and interaction with BSA Protein
We report herein the uracil-di-aza-amino acid (UrAA) as a new family of molecular scaffold to induce β-hairpin structure with H-bonded β-sheet conformation in a short peptide. This has been demonstrated in two conceptual fluorescent pentapeptides wherein triazolylpyrenyl alanine and/or triazolylmethoxynapthyl alanine (TPyAlaDo and/or TMNapAlaDo) are embedded into two arms of the uracil-amino acid via an intervening leucine. Conformational analysis by CD, IR, variable temperature and 2D NMR spectroscopy reveals the β-hairpin structures for both the peptides. Study of photophysical property reveals that the pentapeptide containing fluorescent triazolyl unnatural amino acids TMNapAlaDo and TPyAlaDo at the two termini exhibits dual path entry to exciplex emission-either via FRET from TMNapAlaDo to TPyAlaDo or via direct excitation of a FRET acceptor, TPyAlaDo. The other pentapeptide with TPyAlaDo/ TPyAlaDo pair shows excimer emission. Furthermore, both the peptides maintaining their fundamental photophysics are found to interact with BSA as only a test biomolecule.

Publisher URL: www.sciencedirect.com/science

DOI: S0960894X17311046

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