In the presence of Zn2+, the catalytic, amyloid‐forming peptide Ac‐IHIHIQI‐NH2, was found to exhibit enhanced selectivity for hydrophobic p‐nitrophenyl ester substrates while in the process of self‐assembly. As opposed to the substrate p‐nitrophenyl acetate, which was more effectively hydrolyzed with Ac‐IHIHIQI‐NH2 in its fully fibrillar state, the hydrophobic substrate Z‐L‐Phe‐ONp was converted with
在 Zn2+ 存在下,发现催化性淀粉样蛋白形成肽 Ac-IHIHIQI-NH2 在自组装过程中对疏
水性对
硝基苯酯底物表现出增强的选择性。与底物
对硝基苯乙酸盐相反,后者在完全原纤维状态下被 Ac-IHIHIQI-NH2 更有效地
水解,疏
水底物 Z-L-Phe-ONp 以大于 11-的二级速率常数转化当催化剂积极组装时,它会增加数倍。在这种条件下,Z-L-Phe-ONp 的
水解速度比亲
水性更强且更不稳定的 Boc-L-Asn-ONp 酯的
水解速度更快。组装时,催化剂对 Z-Phe-ONp 的 L-对映体也表现出更高的选择性。