Peptide dendrimer enzyme models for ester hydrolysis and aldolization prepared by convergent thioether ligation
作者:Nicolas A. Uhlich、Tamis Darbre、Jean-Louis Reymond
DOI:10.1039/c1ob05877k
日期:——
Peptide dendrimers with multiple histidines or N-terminal prolines efficiently catalyze ester hydrolysis or aldol reactions in aqueous medium. Part of the catalytic proficiency of these dendritic enzyme models stems from multivalency effects observed in G2, G3 and G4 dendrimers displaying multiplecatalyticgroups in their branches. To study multivalency in higher generation systems, G4, G5 and G6
Two 6750-membered one-bead-one-compound peptidedendrimercombinatorial libraries L (X4)8(LysX3)4(LysX2)2LysX1 (X1−4 = 14 different amino acids or deletion, Lys = branching lysine residue) and AcL (with N-terminal acetylation) were prepared by split-and-mix solid phase peptide synthesis. Screening toward fluorogenic substrates for esterase and aldolase activities using the in silica off-bead assay
两个6750元单珠一化合物肽树状聚合物组合文库L(X 4)8(Lys X 3)4(Lys X 2)2 Lys X 1(X 1-4 = 14个不同的氨基酸或缺失,Lys通过分体混合固相肽合成法制备(支链赖氨酸残基)和AcL(具有N末端乙酰化)。朝向酯酶荧光底物和醛缩酶使用活动筛选在二氧化硅脱珠测定(N.美拉德等人,J.梳子。化学式2009,11,667-675)和胎圈通过氨基酸分析揭示解码组氨酸含有针对荧光素二乙酸酯活性的序列。异丁荧光素,一个相关的疏水性的荧光底物,是优先被从库树枝状水解ACL包含疏水性残基如AcH3(AcHis)8(赖氨酸LEU)4(赖氨酸缬氨酸)2的Lys LysOH,相比于简单的寡聚组氨酸肽作为参考催化剂。从库中聚阳离子树枝状大号具有多个游离N-末端如H8(His)的8(赖氨酸βAla)4(Lys Thr)2 Lys aProNH 2(aPro =(2 S,4 S)-