Hydrolysis of (1→3)- and (1→2)-β-d-xylosidic linkages by an endo-(1→4)-β-d-xylanase of Cryptococcus albidus
作者:Mária Vršanská、Ján Hirsch、Pavol Kováč、Peter Biely
DOI:10.1016/0008-6215(90)80064-a
日期:1990.10
specificity of an endo-(1→4)-β- d -xylanase of the yeast Cryptococcusalbidus was investigated using a series of methyl β- d -xylotriosides. In addition to (1→4) linkages, the enzyme could cleave (1→3) and (1→2) linkages adjacent to a (1→4) linkage and further from the non-reducing end of the substrate. The enzyme could hydrolyse a (1→3) linkage that attached a terminal xylopyranosyl group to a (1→4)-linked
methanol followed by Zemplen deacetylation. Methyl beta-D-xylopyranoside, methyl beta-D-xylobioside and methyl beta-D-xylotrioside were subjected to treatment with dibutyltin oxide followed by reaction with the trimethylamine/sulfurtrioxide complex in tetrahydrofuran. This way, preferential sulfation of the terminal 4-hydroxy group at the nonreducing xylopyranosyl unit was achieved. In addition, partial sulfation
A traceless photocleavable linker for the automated glycan assembly of carbohydrates with free reducing ends
作者:M. Wilsdorf、D. Schmidt、M. P. Bartetzko、P. Dallabernardina、F. Schuhmacher、P. H. Seeberger、F. Pfrengle
DOI:10.1039/c6cc04954k
日期:——
A traceless photocleavable linker for automated glycan assembly provides access to complex carbohydrates with free reducing ends, as demonstrated with the successful preparation of nine plant cell wall-related oligosaccharides.