D-肽作为天然存在的 L-肽的对映异构体,通常抵抗内源性蛋白酶,并且可能对大多数酶不敏感。但是,尚不清楚磷酸酶是否或如何催化 D-肽的去磷酸化。在这项工作中,我们通过酶促脱磷酸作用检查了 D 肽纳米纤维的形成。通过比较基于 L-肽和 D-肽的水凝胶的酶促水凝胶,我们发现水凝胶前体的手性对从酪氨酸磷酸残基中去除磷酸基团导致的酶促水凝胶影响很小。治疗剂(例如,紫杉醇)或荧光团(例如,4-硝基-2,1,3-苯并恶二唑)与基于 D-肽的水凝胶剂的连接提供了一种新型的生物稳定或生物相容性水凝胶剂,可分别应用于瘤内化疗或细胞内成像。这项工作是对 D 肽意外酶促脱磷酸化的首次全面系统研究,它说明了一种生成具有生物稳定性和其他所需功能的超分子水凝胶的有用方法。
A Concerted Enzymatic and Bioorthogonal Approach for Extra‐ and Intracellular Activation of Environment‐Sensitive Ruthenium(II)‐Based Imaging Probes and Photosensitizers
作者:Justin Shum、Lawrence Cho‐Cheung Lee、Michael Wai‐Lun Chiang、Yun‐Wah Lam、Kenneth Kam‐Wing Lo
DOI:10.1002/anie.202303931
日期:2023.7.17
self-assembly to target overexpressed alkaline phosphatases in cancer cells and bioorthogonal reactions for controllable extracellular and intracellular activation of RuII-based imaging probes and photosensitizers is presented. The emission enhancement, lifetime extension, and (photo)cytotoxicity of the resulting RuII supramolecularassemblies were explored extracellularly and intracellularly.
Anisotropy or alignment is a critical feature of functional soft materials in living organisms, but it remains a challenge for spontaneously generating anisotropic gel materials. Here we report a molecular design that increases intermolecular aromatic-aromatic interactions of hydrogelators during enzymatic hydrogelation for spontaneously forming an anisotropic hydrogel. This process, relying on both aromatic aromatic interactions and enzyme catalysis, results in spontaneously aligned supramolecular nanofibers as the matrices of a monodomain hydrogel that exhibits significant birefringence. This work, as the first example of monodomain hydrogels formed via an enzymatic reaction, illustrates a new biomimetic approach for generating aligned anisotropic soft materials.