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Self‐Assembly Propensity Dictates Lifetimes in Transient Naphthalimide–Dipeptide Nanofibers
Author(s) -
Kumar Mohit,
Sementa Deborah,
Narang Vishal,
Riedo Elisa,
Ulijn Rein V.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202001008
Subject(s) - dipeptide , fluorophore , nanofiber , chemistry , sted microscopy , amino acid , fluorescence , self assembly , transient (computer programming) , oligopeptide , sequence (biology) , hydrolysis , peptide , biophysics , stereochemistry , materials science , nanotechnology , organic chemistry , biochemistry , stimulated emission , optics , biology , laser , physics , computer science , operating system
Transient self‐assembly of dipeptide nanofibers with lifetimes that are predictably variable through dipeptide sequence design are presented. This was achieved using 1,8‐naphthalimide ( NI ) amino acid methyl‐esters (Phe, Tyr, Leu) that are biocatalytically coupled to amino acid‐amides (Phe, Tyr, Leu, Val, Ala, Ser) to form self‐assembling NI ‐dipeptides. However, competing hydrolysis of the dipeptides results in disassembly. It was demonstrated that the kinetic parameters like lifetimes of these nanofibers can be predictably regulated by the thermodynamic parameter, namely the self‐assembly propensity of the constituent dipeptide sequence. These lifetimes could vary from minutes, to hours, to permanent gels that do not degrade. Moreover, the in‐built NI fluorophore was utilized to image the transient nanostructures in solution with stimulated emission depletion (STED) based super‐resolution fluorescence microscopy.