4.8 Article

On Demand Attachment and Detachment of rac-2-Br-DMNPA Tailoring to Facilitate Chemical Protein Synthesis

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ORGANIC LETTERS
卷 23, 期 16, 页码 6477-6481

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AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c02295

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  1. National Natural Science Foundation of China [22077040]
  2. Fundamental Research Funds for the Central Universities of SCUT [2020ZYGXZR056]

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In this study, a novel bifunctional reagent was developed for late-stage protection of peptide cysteine, enabling facile N-terminal and side-chain caging for model peptides and proteins. Additionally, a one-pot ligation and photolysis strategy was successfully applied in the synthesis of the mini-protein chlorotoxin. Furthermore, the utility of the reagent as a bifunctional linker for traceless solid-phase chemical ligation was extended.
Herein, we developed a bifunctional reagent rac-2-Br-DMNPA 2 for the late-stage protection of peptide cysteine. Through the identification of its t-Bu ester 1 as a more competent form under ligation conditions, facile N-terminal and side-chain caging for the model peptide and protein were accomplished. Building upon this, a one-pot ligation and photolysis strategy was applied in the synthesis of the mini-protein chlorotoxin. More importantly, we extended the utility of 2 as a bifunctional linker for traceless solid-phase chemical ligation.

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