Anthranilamide and nitrotyrosine as a donor-acceptor pair in internally quenched fluorescent substrates for endopeptidases: multicolumn peptide synthesis of enzyme substrates for subtilisin Carlsberg and pepsin - PubMed (original) (raw)
Anthranilamide and nitrotyrosine as a donor-acceptor pair in internally quenched fluorescent substrates for endopeptidases: multicolumn peptide synthesis of enzyme substrates for subtilisin Carlsberg and pepsin
M Meldal et al. Anal Biochem. 1991.
Abstract
The preparations of N alpha-Fmoc-3-nitro-L-tyrosine and N-Boc-anthranilic acid Dhbt ester and their application to parallel multiple column solid-phase peptide synthesis is described. A series of peptide substrates containing an anthraniloyl group at the amino terminus and a 3-nitrotyrosyl residue close to the carboxyl terminus have been synthesized. The fluorescence of the anthraniloyl group, intramolecularly quenched by the 3-nitrotyrosine, increases with cleavage of peptide bonds situated between the two groups. The quenching mechanism is of the long-range resonance energy transfer type and long peptide substrates were constructed and used for kinetic measurement on subtilisin Carlsberg and pepsin. Complete quenching was observed even with more than 20 A between the centers of the chromophores, and substrates with up to 50 A between the chromophores were synthesized. The importance of long substrates for optimal enzymatic activity was demonstrated.
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