Synthesis of Peptide Thioacids at Neutral pH Using Bis(2-sulfanylethyl)amido Peptide Precursors
摘要:
Reaction of bis(2-sulfanylethyl)amido (SEA) peptides with trilsopropylsilylthiol in water at neutral pH yields peptide thiocarboxylates. An alkylthioester derived from beta-alanine was used to trap the released bis(2-sulfanylethyl)amine and displace the equilibrium toward the peptide thiocarboxylate.
Synthesis of Peptide Thioacids at Neutral pH Using Bis(2-sulfanylethyl)amido Peptide Precursors
摘要:
Reaction of bis(2-sulfanylethyl)amido (SEA) peptides with trilsopropylsilylthiol in water at neutral pH yields peptide thiocarboxylates. An alkylthioester derived from beta-alanine was used to trap the released bis(2-sulfanylethyl)amine and displace the equilibrium toward the peptide thiocarboxylate.
The reaction of a peptide featuring a bis(2-sulfanylethyl)amino (SEA) group on its C-terminus with a cysteinyl peptide in water at pH 7 and 37 C leads to the chemoselective and regioselective formation of a native peptide bond. This method called SEA ligation enriches the native peptide ligation repertoire available to the peptide chemist. Preparation of an innovative solid support which allows the straightforward synthesis of peptide SEA fragments using standard Fmoc/fert-butyl solid phase peptide synthesis procedures is also described.