by the aminoacid adjacent to the benzene core, irrespective of the absolute configuration of the C‐terminal aminoacid. In addition, molecular chirality also has a significant influence on the gelation behavior. For the diphenylalanine‐based gelators, the homochiral gelators can be gelled through a conventional heating–cooling process, whereas heterochiral gelators form translucent stable gels under
thereby cancelling the order from the first chiralmoiety. This result was achieved through proper coordination with a metalcation. As proof of concept, poly(phenylacetylene)s (PPAs) that bear one and two chiral amino acid units of different sizes and configuration combinations (l/d-alanine and l/d-phenylalanine) as pendants were evaluated. In total, ten polymers were studied. This constitutes the first
Cation–halide transport through peptide pores containing aminopicolinic acid
作者:Debajyoti Basak、Sucheta Sridhar、Amal K. Bera、Nandita Madhavan
DOI:10.1039/c6ob00592f
日期:——
biological significance through membranes could be potentially used in medical diagnostics or therapeutics. Herein, we report cation-selective octapeptide pores derived from alanine and aminopicolinic acid. The ion transport mechanism through the pores has been established to be a cation–chloride symport. The cation–chloride co-transport is biologically essential for the efficient functioning of the central
selectivity of pores by incorporating functional groups inside the pore. Readily accessible octapeptides containing (aminomethyl)benzoic acid and alanine are reported here that preferentially transport cations over halides across the lipid bilayer. Ion transport is hypothesized through pores formed by stable assemblies of the peptides. The aromatic ring(s) appear to be proximal to the pore and could be
Accessing the disallowed conformations of peptides employing amide-to-imidate modification
作者:Damodara N. Reddy、Ravula Thirupathi、Erode N. Prabhakaran
DOI:10.1039/c1cc13515e
日期:——
Selective modification of the C-terminal amide in peptides to dihydrooxazine (a novel stable imidate isostere) by intramolecular nucleophilic cyclo-O-alkylation of the corresponding N-(3-bromopropyl)amides results in constraining of the C-terminal residue in natively disallowed conformations both in crystals and in solution.