Selective and Scalable Synthesis of Sugar Alcohols by Homogeneous Asymmetric Hydrogenation of Unprotected Ketoses
作者:Daniel J. Tindall、Steffen Mader、Alois Kindler、Frank Rominger、A. Stephen K. Hashmi、Thomas Schaub
DOI:10.1002/anie.202009790
日期:2021.1.11
with none to low stereoselectivities. Now, we present a homogeneous system based on commercially available components, which not only increases the overall yield, but also allows a wide range of unprotected ketoses to be diastereoselectively hydrogenated. Furthermore, the system is reliable on a multi‐gram scale allowing sugar alcohols to be isolated in large quantities at high atom economy.
The present invention relates to a hetero-transglycosylase protein having cellulose:xyloglucan endotransglucosylase (CXE) activity in addition to mixed-linkage beta-glucan:xyloglucan endotransglucosylase (MXE) activity. The protein may comprise the amino acid sequence of any one of SEQ ID NOs: 2, 6 and 8 or a functional fragment thereof; or an amino acid sequence having at least 60% sequence identity to any one of SEQ ID NO: 2, 6 and 8, or to SEQ ID NO: 2 from amino acid 22 to 280, to SEQ ID NO: 6 from amino acid 26 to 283, or to SEQ ID NO: 8 from amino acid 29 to 287. The invention furthermore relates to an isolated nucleic acid encoding the protein described herein, a chimeric gene comprising, inter alia, the nucleic acid described herein, a vector comprising said chimeric gene, a host cell comprising said vector or said chimeric gene and an according transgenic plant. Further disclosed herein in are a method of producing a transgenic plant and a method of improving properties of cellulosic material.
本发明涉及一种具有纤维素:木聚糖内转糖基酶(CXE)活性和混合连接β-葡聚糖:木聚糖内转糖基酶(MXE)活性的异转糖基酶蛋白。该蛋白质可包括 SEQ ID NO:2、6 和 8 中任一个的氨基酸序列或其功能片段;或与 SEQ ID NO:2、6 和 8 中任一个具有至少 60% 序列同一性的氨基酸序列,或与 SEQ ID NO:2 从氨基酸 22 至 280、SEQ ID NO:6 从氨基酸 26 至 283 或 SEQ ID NO:8 从氨基酸 29 至 287 具有至少 60% 序列同一性的氨基酸序列。本发明还涉及编码本文所述蛋白质的分离核酸、除其他外包含本文所述核酸的嵌合基因、包含所述嵌合基因的载体、包含所述载体或所述嵌合基因的宿主细胞以及相应的转基因植物。本文进一步公开了一种生产转基因植物的方法和一种改善纤维素材料性能的方法。