Incorporation of Selenomethionine into Proteins through Selenohomocysteine-Mediated Ligation
作者:Gerard Roelfes、Donald Hilvert
DOI:10.1002/anie.200250830
日期:2003.5.23
Facile, Fmoc-Compatible Solid-Phase Synthesis of Peptide C-Terminal Thioesters
作者:Dominique Swinnen、Donald Hilvert
DOI:10.1021/ol0060836
日期:2000.8.1
A short route to peptide C-terminal thioesters was developed that does not require the use of special linkers or resins and is compatible with standard Fmoc chemistry. Following conventional solid-phase peptide synthesis, an excess of Me(2)AlCl and EtSH in dichloromethane cleaves peptides from Wang or Pam resins to give the corresponding thioesters directly in good yield and purity.
C-Terminal peptide thioesters are shown to react efficiently with peptide fragments containing an N-terminal selenocysteine to give selenoproteins. In analogy to the native chemical ligation of thioesters and peptides containing N-terminal cysteines, the selenol presumably attacks the thioester nucleophilically to give a selenoester intermediate that subsequently rearranges to give a native chemical
C-末端肽硫酯显示出与含有 N-末端硒代半胱氨酸的肽片段有效反应以产生硒蛋白。类似于硫酯和含有 N 末端半胱氨酸的肽的天然化学连接,硒醇可能会亲核攻击硫酯以产生硒酯中间体,该中间体随后重新排列以产生天然化学键。该程序的实用性通过合成牛胰蛋白酶抑制剂 (BPTI) 的含硒衍生物来证明,其中 Cys38 被硒代半胱氨酸取代。人工硒蛋白折叠成与野生型 BPTI 相似的构象,并以不变的亲和力抑制胰蛋白酶和糜蛋白酶。