Stereo- and Regioselective Azide/Alkyne Cycloadditions in Carbonic Anhydrase II via Tethering, Monitored by Crystallography and Mass Spectrometry
作者:Johannes Schulze Wischeler、Dong Sun、Nicola U. Sandner、Uwe Linne、Andreas Heine、Ulrich Koert、Gerhard Klebe
DOI:10.1002/chem.201002437
日期:2011.5.16
The carbonic anhydrase II mutant His64Cys was prepared and applied to tethered alkyne/azide cycloaddition reactions. The azide component could be tethered to the enzyme surface through a disulfide bridge, while the alkyne component was reversibly coordinated through a sulfonamide anchor to the zinc ion in the original catalytic center of the enzyme. The incipient orientation of the reactants in the
制备了碳酸酐酶II突变体His64Cys,并将其用于拴系的炔烃/叠氮化物环加成反应。叠氮化物组分可以通过二硫键连接到酶的表面,而炔烃组分则通过磺酰胺锚与酶的原始催化中心的锌离子可逆地配位。通过结晶学表征反应物在结合位点和形成的三唑产物的初始取向。反应进程可通过HPLC-MS分析进行监控。