Photoswitching tripodal single molecular tip for noncontact AFM measurements: synthesis, immobilization, and reversible configurational change on gold surface
摘要:
我们设计了由四代金刚烷、三个苯基乙炔腿和一个可逆光开关顶点组成的三足式分子,作为 "单分子尖端",用于对基底表面进行化学和地形表征。通过三个 S-Au 键共价连接到金涂层 AFM 针尖上,这些刚性三足分子有望成为尖锐、坚固和固定的分子针尖,在紫外线或可见光照射下,其构型可发生可逆变化。本报告全面介绍了两种光开关三脚架分子尖端的合成、它们在金(111)表面的固定以及通过 SPM 测量检测金(111)表面上光诱导的构型变化。
Reversible Photoregulation of Binding of α-Chymotrypsin to a Gold Surface
作者:David Pearson、Alison J. Downard、Andrew Muscroft-Taylor、Andrew D. Abell
DOI:10.1021/ja0766674
日期:2007.12.1
An ability to optically modulate the interactions of surfaces with functional biomolecules provides an important basis for generating new technologies including reversible biosensors, advanced medical implants, and biomolecular computers. Here we report the first example of reversible photoregulation of binding of a protease to a functional surface. A modular approach is presented with a surface-bound inhibitor containing a photoisomerizable azobenzene core to which is attached (i) appropriate protease binding functionality and (ii) a tether for surface attachment. The principle is demonstrated for M-chymotrypsin using a phenylalanine-based trifluoromethyl ketone inhibitor containing an azobenzene core and an alkyne-functionalized ethylene glycol tether, which is attached to the surface using click chemistry, UV/vis irradiation of the functional surface leads to a significant, reversible change in the amount of alpha-chymotrypsin that attaches to the surface, as measured by surface plasmon resonance.