Esterolytic Peptide Dendrimers with a Hydrophobic Core and Catalytic Residues at the Surface
作者:Anthony Clouet、Tamis Darbre、Jean-Louis Reymond
DOI:10.1002/adsc.200404070
日期:2004.8
used as branching unit for the synthesis of second generation peptide dendrimers with six individually addressable variable amino acid positions. Three pairs of diastereomeric dendrimers were prepared bearing a common hydrophobic core and permutations of the catalytic triad amino acids aspartate, histidine and serine at the surface. Dendrimers with two surface histidine residues catalyzed the hydrolysis
由(R)-3-氨基丙烷-1,2-二醇制得(3S)-4-(9-芴基甲氧基羰基氨基)-3-甲基(烯丙氧基羰基)氨基乙基氧基乙酸(1),并用作第二合成的支化单元。具有六个可单独寻址的可变氨基酸位置的新一代肽树状聚合物。制备三对非对映体树枝状聚合物,其具有共同的疏水性核心和表面上催化三联体氨基酸天冬氨酸,组氨酸和丝氨酸的排列。具有两个表面组氨酸残基的树枝状大分子在pH 6.0的水性缓冲液中催化了荧光的8-酰氧基py1,3,6-三磺酸盐的水解,并在10 3内提高了k cat / k uncat的速率范围和Michaelis-Menten常数K M在10 -4 M范围内。底物识别涉及静电相互作用,如competitive-1,3,6,8-四磺酸盐对催化的竞争性抑制所示。在最活跃的树状聚合物中,丁酰基和壬酰基酯之间的K M降低4至7倍,为底物结合中的疏水成分提供了证据,而在密切相关的,活性较低的非对映体肽树状聚合物中则没有这种成分。