Development of Naturally Inspired Peptide and Protein Chemistry.

Diverse naturally occurring events relevant to proteins, including processing and post-translational modification, provide significant clues enabling advances in peptide/protein chemistry. Our motivation to synthesize large proteins prompted us to seek scientific bases utilized in synthetic experiments on the intein-mediated protein processing system. This account describes peptide/protein thioester-producing protocols whose design is based on acyl transfer reactions observed in the intein system, and the development of the stimulus-responsive amide cleavage and its application to the modulation of peptide function. Finally, several findings derived from nature-inspired research efforts, including peptide mimetic synthesis and S-protected cysteine chemistry, are described.