Abstract
By investigating 17 peptide arylthioesters that were previously challenging to produce, this study reveals a clear correlation between increased ligation activity and decreased pKa values of their corresponding arylthiols. The observed differences are attributed to variations in thioester bond strength and steric hindrance. These insights have led to the development of an improved one-pot chemical protein synthesis approach that leverages the reactivity differences between peptide arylthioesters with C-terminal Ala-S-Ph(4-NO2) and Ala-S-Ph(2,6-diCH3). This approach eliminates the need for thiol-thioester exchange and additive removal steps while enabling in situ desulfurization, thereby significantly simplifying the protein synthesis process.
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