photoresponsive supramolecular hydrogelators were discovered, the gel-sol/sol-geltransition of which was pseudo-reversibly induced by light. Studying the optimal hydrogel by NMR spectroscopy and various microscopy techniques showed that the trans-cis photoisomerization of the double bond of the fumaric amide unit effectively caused assembly or disassembly of the self-assembled supramolecular fibers to yield
Fluorescence Activated Cell Sorting as a General Ultra-High-Throughput Screening Method for Directed Evolution of Glycosyltransferases
作者:Guangyu Yang、Jamie R. Rich、Michel Gilbert、Warren W. Wakarchuk、Yan Feng、Stephen G. Withers
DOI:10.1021/ja104167y
日期:2010.8.4
Glycosyltransferases (GTs) offer very attractive approaches to the synthesis of complex oligosaccharides. However, the limited number of available GTs, together with their instability and strict substratespecificity, have severely hampered the broad application of these enzymes. Previous attempts to broaden the range of substrate scope and to increase the activity of GTs via protein engineering have met with
of biological activities. We report a novel polyanion-selective fluorescence sensing system composed of a hybrid material of supramolecularhydrogel, enzymes, and aminoethyl-modified MCM41-type mesoporous silica particles (NH(2)-MCM41) encapsulating anionic fluorescent dyes. The rational combination of the polyanion-exchange ability of NH(2)-MCM41 and semi-wetsupramolecularhydrogel matrix successfully