作者:David Lagnoux、Estelle Delort、Céline Douat-Casassus、Annamaria Esposito、Jean-Louis Reymond
DOI:10.1002/chem.200305578
日期:2004.3.5
Peptide dendrimers were prepared by solid-phase peptide synthesis. Monomeric dendrimers were first obtained by assembly of a hexapeptide sequence containing alternate standard alpha-amino acids with diamino acids as branching units. The monomeric dendrimers were then dimerized by disulfide-bridge formation at the core cysteine. The synthetic strategy is compatible with functional amino acids and different
通过固相肽合成制备肽树状聚合物。单体树状聚合物首先通过组装含有交替的标准α-氨基酸和二氨基酸作为分支单元的六肽序列而获得。然后通过在核心半胱氨酸处的二硫键形成二聚体来使单体树状聚合物二聚。合成策略与功能性氨基酸和不同的二氨基酸分支单元兼容。当组氨酸残基位于最外层时,由催化三联体氨基酸组氨酸,天冬氨酸和丝氨酸组成的肽树状聚合物催化N-甲基喹啉鎓盐的水解。树状聚合物催化的7-异丁酰基-N-甲基喹啉鎓的水解遵循饱和动力学,其催化速率常数/无催化速率常数(k(cat)/ k(uncat))值为3350,催化速率常数/ Michaelis常数(k(cat)/ K(M))值是4-甲基咪唑催化反应的二级速率常数的350倍; 这相当于每个组氨酸侧链的速率提高了40倍。催化作用可归因于在树枝状聚合物表面上组氨酸残基的存在。