A Threonine‐Forming Oxazetidine Amino Acid for the Chemical Synthesis of Proteins through KAHA Ligation
作者:Simon Baldauf、Dominik Schauenburg、Jeffrey W. Bode
DOI:10.1002/anie.201906486
日期:2019.9.2
α-Ketoacid-hydroxylamine (KAHA) ligation allows the coupling of unprotected peptide segments through the chemoselective formation of an amide bond. Currently, the most widely used variant employs a 5-membered cyclic hydroxylamine that forms a homoserine ester as the primary ligation product. In order to directly form amide-linked threonine residues at the ligation site, we prepared a new 4-membered
α-酮酸-羟胺(KAHA)连接可通过化学键形成酰胺键来偶联未保护的肽段。当前,最广泛使用的变体采用形成高丝氨酸酯作为主要连接产物的5元环羟胺。为了在连接位点直接形成酰胺连接的苏氨酸残基,我们准备了一个新的4元环羟胺结构单元。该单体用于合成野生型泛素结合酶UbcH5a(146个残基)和Titin蛋白结构域TI I27(89个残基)。在泛素化测定中,所得的UbcH5a和具有两个高丝氨酸残基的变体均显示出与重组变体相同的活性。