作者:Liuqing Wen、Kenneth Huang、Mohui Wei、Jeffrey Meisner、Yunpeng Liu、Kristina Garner、Lanlan Zang、Xuan Wang、Xu Li、Junqiang Fang、Houcheng Zhang、Peng George Wang
DOI:10.1002/anie.201505714
日期:2015.10.19
Studies of rare ketoses have been hampered by a lack of efficient preparation methods. A convenient, efficient, and cost‐effective platform for the facile synthesis of ketoses is described. This method enables the preparation of difficult‐to‐access ketopentoses and ketohexoses from common and inexpensive starting materials with high yield and purity and without the need for a tedious isomer separation
Transketolase (TK) from various origins (including Escherichia coli and yeast) has been described to be fully enantiomer specific for (2R)‐hydroxyaldehyde substrates. A thermostable TK from Geobacillus stearothermophilus (TKgst) was found to display a minor reactivity for (2S)‐hydroxylated aldehydes. To improve this activity by directed protein evolution, we have built a library of TKgst variants by
An object of the present invention is to provide a novel ketose 3-epimerase, a process for producing the same, a DNA encoding the enzyme, a recombinant DNA and transformant comprising the DNA, and a process for producing a ketose by using the enzyme. The present invention solves the above objects by providing a ketose 3-epimerase which is obtainable from a microorganism of the genus Rhizobium, a process for producing the same, a DNA encoding the enzyme, a recombinant DNA and transformant comprising the DNA, and a process for converting D- or L-ketohexose into corresponding D- or L-ketohexose by epimerizing the hydroxyl group at the C-3 position of the D- or L-ketohexose; and D- or L-ketopentose into corresponding D- or L-ketopentose by epimerizing the hydroxyl group at the C-3 position of the D- or L-ketopentose; by using the enzyme.
Furthermore, the isomerization of d-arabinose and l-fucose byDd-arabinose and l-fucose by d-arabinose isomerase from bacterial sources for the production of d-ribulose and l-fuculose have not yet become industrial due to the shortage of biocatalysts, resulting in poor yield and high cost of production. In this study, a thermostable d-ribulose- and l-fuculose producing d-arabinose isomerase from the bacterium
Supramolecular stabilization of acid tolerant l-arabinose isomerase from Lactobacillus sakei
作者:Said Jebors、Yannick Tauran、Nushin Aghajari、Samira Boudebbouze、Emmanuelle Maguin、Richard Haser、Anthony W. Coleman、Moez Rhimi
DOI:10.1039/c1cc14930j
日期:——
L-Arabinose isomerase stability is a crucial criterion for the industrial application of this biocatalyst. Noria and NoriaPG are capable of increasing the L-arabinose isomerase stability not only at high temperatures but also at low pH. Such results highlight, for the first time, the use of the Noria series of molecules for protein stabilization and activation.