A Novel Xylosylphosphotransferase Activity Discovered in Cryptococcus neoformans
作者:Morgann C. Reilly、Steven B. Levery、Sherry A. Castle、J.Stacey Klutts、Tamara L. Doering
DOI:10.1074/jbc.m109.056226
日期:2009.12
Cryptococcus neoformans is a fungal pathogen that causes serious disease in immunocompromised individuals. The organism produces a distinctive polysaccharide capsule that is necessary for its virulence, a predominantly polysaccharide cell wall, and a variety of protein- and lipid-linked glycans. The glycan synthetic pathways of this pathogen are of great interest. Here we report the detection of a novel glycosylphosphotransferase activity in C. neoformans, identification of the corresponding gene, and characterization of the encoded protein. The observed activity is specific for UDP-xylose as a donor and for mannose acceptors and forms a xylose-alpha-1-phosphate-6-mannose linkage. This is the first report of a xylosylphosphotransferase activity in any system.
Ogawa, Tomoya; Yamamoto, Hisao, Agricultural and Biological Chemistry, 1985, vol. 49, # 2, p. 475 - 482
作者:Ogawa, Tomoya、Yamamoto, Hisao
DOI:——
日期:——
Direct stereochemical assignment of hexose and pentose residues in flavonoidO-glycosides by fast atom bombardment and electrospray ionization mass spectrometry
作者:Filip Cuyckens、Abdelaaty A. Shahat、Luc Pieters、Magda Claeys
DOI:10.1002/jms.402
日期:2002.12
Mass spectrometric methods have been developed which allow the direct stereochemical assignment of terminal monosaccharide residues in flavonoid O-glycosides without the need for chemical hydrolysis. Standards containing a glucose, galactose, mannose, xylose, arabinose or apiose residue were examined because these monosaccharides are by far the most commonly encountered in flavonoid glycosides. Following