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
A simple preparation of α- and β-nigerose octaacetate and β-nigerotriose hendecaacetate by the acetolysis of an alkali-soluble d-glucan from the fruit body of Laetiporus sulphureus
作者:Ken'ichi Takeo、Sakae Matsuzaki
DOI:10.1016/0008-6215(83)88243-3
日期:1983.3
alkali-soluble d -glucan, isolated from the fruit body of Laetiporus sulphureus , followed by fractionation of the products on a column of silica gel, provide a simple, preparative approach to the peracetates of 3- O -α- d -glucopyranosyl- d-glucose (nigerose) and of O -α- d -glucopyranosyl-(1→3)- O -α- d -glucopyranosyl-(1→3)- d-glucose (nigerotriose). The synthesis of methyl β-, benzyl β-, phenyl α-, and
Nigerose [alpha-D-Glcp-(1 --> 3)-D-Glcp], nigerotriose, nigerotetraose, and nigeropentaose have been synthesized by chain elongation starting at the reducing end, from the corresponding octa-, undeca-, tetradeca-, and heptadeca-beta-D-acetates, respectively, via thioglycoside-mediated 1,2-cis coupling, using 1,2,4,6-tetra-O-acetyl-beta-D-glucopyranose as the glucosyl acceptor and methyl 2,3,4,6-tetra-O-benzyl-1-thio-beta-D-glucopyranoside, methyl 3-O-allyl-2,4,6-tri-O-benzyl-1-thio-beta-D-glucopyranoside, and methyl O-(2,3,4,6-tetra-O-benzyl-alpha-D-glucopyranosyl)-(1 --> 3)-2,4,6-tri-O-benzyl-1-thio-beta-D-glucopyranoside as the donors.
Dehydrative Glycosylation Using Heptabenzyl Derivatives of Glucobioses and Lactose
reducing tribenzylglucose moiety of the nonreducing tetrabenzylglucosyl residue and on the class of the OH group to be glycosylated. The use of a quaternary mixture of p-nitrobenzenesulfonyl chloride, silver trifluoromethanesulfonate, N,N-dimethylacetamide, and triethylamine made all but the β(1→2)-linked biosyl donor undergo α-condensation. Several new linear trisaccharides were obtained via debenzylation
Structural basis of the strict specificity of a bacterial GH31 α-1,3-glucosidase for nigerooligosaccharides
作者:Marina Ikegaya、Toshio Moriya、Naruhiko Adachi、Masato Kawasaki、Enoch Y. Park、Takatsugu Miyazaki
DOI:10.1016/j.jbc.2022.101827
日期:2022.5
enzymes are involved in the degradation, biosynthesis, and modification of carbohydrates and vary with the diversity of carbohydrates. The glycoside hydrolase (GH) family 31 is one of the most diverse families of carbohydrate-active enzymes, containing various enzymes that act on α-glycosides. However, the function of some GH31 groups remains unknown, as their enzymatic activity is difficult to estimate