5 years ago

The Prebiotic C-Terminal Elongation of Peptides Can Be Initiated by N-Carbamoyl Amino Acids

The Prebiotic C-Terminal Elongation of Peptides Can Be Initiated by N-Carbamoyl Amino Acids
Ninette Abou Mrad, Fabrice Duvernay, Robert Pascal, Jean-Christophe Rossi, Grégoire Danger, Ghinwa Ajram, Laurent Boiteau
The formation of peptides upon 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC)-promoted activation of N-carbamoylamino acids (CAA), was considered in the scope of our recent works on carbodiimide promoted C-terminus elongation of peptides in a prebiotic context. Thus EDC promoted activation of CAA derivatives of Tyr(Me) or Ala in dilute aqueous medium pH 5.5–6.5 in the presence of excess of AA, resulted in peptide formation by C-terminus activation/elongation. Kinetic results similar to those of EDC-mediated activation of N-acyl-AA lead us to postulate the formation of a 2-amino-5(4H)-oxazolone intermediate by cyclization of the activated CAA, in spite of the absence of epimerization occurred at CAA residues. Thus, in a prebiotic context, CAA may have played a similar role as N-acyl-AA in the initiation of C-terminus peptide elongation. From the land before time: 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC)-promoted activation of N-carbamoyl amino acid in dilute aqueous medium leads to peptide formation; an oxazolone intermediate is postulated, although no epimerization was observed.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201700702

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