Large-scale synthesis of globotriose derivatives through recombinant E. coli
作者:Jianbo Zhang、Przemyslaw Kowal、Xi Chen、Peng George Wang
DOI:10.1039/b304911f
日期:——
The carbohydrate chains decorating cell membranes and secreted proteins participate in a range of important biological processes. However, their ultimate significance and possible therapeutic potential have not been fully explored due to the lack of economical methods for their production. This study is an example of the use of a genetically engineered bacterial strain in the preparation of diverse oligosaccharides. Based on an ex vivo biosynthetic pathway, an artificial gene cluster was constructed by linking the genes of five associated enzymes on a plasmid vector. This plasmid was inserted into the E. coli NM522 strain to form globotriose-producing cells (‘superbug’ pLDR20-CKTUF). The specific strain was conveniently applied to the synthesis of globotriose trisaccharide and its derivatives, as potential neutralizers for Shiga toxin. This work demonstrates a novel and economical method for generating ligand diversity for carbohydrate drug development.
Efficient chemoenzymatic synthesis of globotriose and its derivatives with a recombinant α-(1→4)-galactosyltransferase
作者:Jianbo Zhang、Przemyslaw Kowal、Jianwen Fang、Peter Andreana、Peng George Wang
DOI:10.1016/s0008-6215(02)00106-4
日期:2002.6
A truncated alpha-(1-->4)-galactosyltransferase (LgtC) gene from Neisseria meningitidis was cloned. The recombinant glycosyltransferase was expressed in Escherichia coli BL21 (DE3) strain with high specific activity (5 units/mg protein). Its acceptor specificity was carefully characterized. Then the purified enzyme was utilized in highly efficient syntheses of globotriose and a variety of alpha-(1-->4)-galactosylated derivatives as potential antibacterial agents. (C) 2002 Published by Elsevier Science Ltd.
Congruent Strategies for Carbohydrate Sequencing. 1. Mining Structural Details by MS<i><sup>n</sup></i>
作者:David Ashline、Suddham Singh、Andy Hanneman、Vernon Reinhold
DOI:10.1021/ac050724z
日期:2005.10.1
Excessive fragmentation is the property of small oligomers where collisional energy within a smaller number of oscillators dissipates through extensive fragmentation. The procedures discussed in this report are unified into a singular strategy using an ion trap mass spectrometer with the sensitivity expected for electron multiplier detection. Although a small set of structures have been discussed, the