凝集素LecA是铜绿假单胞菌的致病因子,参与肺损伤,死亡率和细胞侵袭。与人糖缀合物竞争LecA结合的配体因此有望抵抗铜绿假单胞菌感染。我们从聚焦的半乳糖苷(Gal)-缀合物阵列中鉴定出了一种新型二价配体,该配体以非常高的亲和力(K d = 82 n M)与LecA结合。LecA与配体配合的晶体结构以及建模研究证实了其螯合LecA的两个结合位点的能力。的配体时降低在0.05-5μ的范围内施加P.细胞侵袭假单胞菌高达90%中号。因此,该配体可能导致抗铜绿假单胞菌感染的药物的开发。
Synthesis of α-d-galactopyranosyl-linked oligosaccharides having an anomeric 4-nitrophenyl group by the use of a 2,6-di-O-(4-methoxybenzyl) derivative of d-galactose as a donor
α-Galactobiosyl units: thermodynamics and kinetics of their formation by transglycosylations catalysed by the GH36 α-galactosidase from Thermotoga maritima
作者:Anna S. Borisova、Dina R. Ivanen、Kirill S. Bobrov、Elena V. Eneyskaya、Georgy N. Rychkov、Mats Sandgren、Anna A. Kulminskaya、Michael L. Sinnott、Konstantin A. Shabalin
DOI:10.1016/j.carres.2014.11.003
日期:2015.1
a limiting factor for application of the enzyme in the directed synthesis of oligogalactosides. However, this property can be used as a convenient tool in studies of thermodynamics of a glycosidic bond. Here, a novel approach to energy difference estimation is suggested. Both transglycosylation and hydrolysis of three types of galactosidic linkages were investigated using total kinetics of formation
synthesized using galactose as the substrate and α-galactosidase from Aspergillus niger as the catalyst. In the reaction, synthesized products of U1, U2, U3, and U4 were detected by high-performance liquid chromatography. By mass spectrometry, nuclear magnetic resonance, and 1-phenyl-3-methyl-5-pyrazolone derivatization, U1 was the mixture of disaccharides of α-d-Galp-(1→1)-α-d-Gal, α-d-Galp-(1→2)-α-d-Gal,
在这项研究中,以半乳糖为底物,黑曲霉的α-半乳糖苷酶为催化剂,合成了α-半乳糖寡糖(α-GOSs)。在该反应中,通过高效液相色谱法检测到U1,U2,U3和U4的合成产物。通过质谱,核磁共振和1-苯基-3-甲基-5-吡唑啉酮衍生化,U1是α- d -Gal p-(1→1)-α- d -Gal,α-的二糖混合物d -Gal p - (1→2)-α- d -Gal,α- d -Gal p - (1→3)-α- d -Gal,α- d -Gal p - (1→4)-α - d-Gal,U2被鉴定为α- d -Gal p-(1→6)-α- d- Gal,U3是通过一个α-(1→6)-糖苷键和另一个α-连接的半乳糖的混合物-糖苷键,并且U4被鉴定为α- d- Gal p-(1→6)-α- d- Gal p-(1→6)-α- d- Gal。然后,使用天然材料合成的α-GOSs(U1,U2,U3,U4
Glycosylation in room temperature ionic liquid using unprotected and unactivated donors
作者:Tae-Joon Park、Michel Weïwer、Xuejun Yuan、Sultan N. Baytas、Eva M. Munoz、Saravanababu Murugesan、Robert J. Linhardt
DOI:10.1016/j.carres.2006.11.022
日期:2007.2
Glycosylation in room temperature ionic liquid is demonstrated using unprotected and unactivated donors. Modest yields of simple benzyl glycosides and disaccharides of glucose, mannose and N-acetylgalactosamine were obtained in 1-ethyl-3-methylimidazolium benzoate with Amberlite IR-120 (H+) resin or p-toluenesulfonic acid as promoters. (c) 2006 Elsevier Ltd. All rights reserved.
Transgalactosylation products from melibose by the .ALPHA.-galactosidase of Absidia corymbifera.