title: Syntheses of 4-methylumbelliferyl-beta-D-xylobioside and 5-bromo-3-indolyl-beta-D-xylobioside for sensitive detection of xylanase activity on agar plates.
abstract: 4-Methylumbelliferyl-beta-D-xylobioside (MU-X2) and 5-bromo-3-indolyl-beta-D-xylobioside (BI-X2) were synthesized as substrates for the detection of xylanase activity on agar plates. A family F/10 xylanase from Streptomyces olivaceoviridis E-86 (FXYN) was able to be more sensitively detected than RBB-xylan by using MU-X2 as a substrate. A mutant xylanase E128H/FXYN having only 1/1000 of the activity of FXYN was also able to be detected on the MU-X2 plate but was not detected on the RBB-xylan plate. A family G/11 xylanase from Streptomyces lividans 66 (Xyn B) was not detected on the MU-X2 plate, but it was able to be detected on the RBB-xylan plate, suggesting that the MU-X2 substrate is specific to family F/10 xylanases. However, none of the xylanases were detected effectively by using BI-X2 as a substrate.
authors.affiliation: NationalFood Research Institute, Ministry of Agriculture, Forestry, and Fisheries, Ibaraki, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kaneko
authors.forename: M
authors.initials: M
authors.lastname: Kitaoka
authors.forename: A
authors.initials: A
authors.lastname: Kuno
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
mesh_terms: D000362:Agar; D002236:Carbohydrate Conformation; D004187:Disaccharides / Q000138:chemical synthesis* / Q000737:chemistry; D007211:Indoles / Q000138:chemical synthesis*; D013302:Streptomyces / Q000201:enzymology; D043325:Xylan Endo-1,3-beta-Xylosidase; D014995:Xylosidases / Q000378:metabolism*
chemical_list: C414004:4-methylumbelliferyl-xylobioside; C414003:5-bromo-3-indolyl-xylobioside; D004187:Disaccharides; D007211:Indoles; D000362:Agar; D014995:Xylosidases; D043325:Xylan Endo-1,3-beta-Xylosidase