title: Purification and properties of a xylanase from Streptomyces lividans.
abstract: An extracellular xylanase produced by a cellulase-negative mutant strain of Streptomyces lividans 1326 was purified to homogeneity. The purified enzyme has an apparent Mr of 43,000 and pI of 5.2. The pH and temperature optima for the activity were 6.0 and 60 degrees C respectively, and the Km and Vmax. values, determined with a soluble oat spelts xylan, were 0.78 mg/ml and 0.85 mmol/min per mg of enzyme. The xylanase showed no activity towards CM-cellulose and p-nitrophenyl beta-D-xyloside. The enzyme degraded xylan, producing mainly xylobiose, a mixture of xylo-oligosaccharides and a small amount of xylose as end products. Its pattern of action on beta-1,4-D-xylan indicates that it is a beta-1,4-endoxylanase (EC 3.2.1.8).
mesh_terms: D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004591:Electrophoresis, Polyacrylamide Gel; D006026:Glycoside Hydrolases / Q000302:isolation & purification* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D013302:Streptomyces / Q000201:enzymology*; D013696:Temperature; D043325:Xylan Endo-1,3-beta-Xylosidase; D014990:Xylans / Q000378:metabolism
chemical_list: D014990:Xylans; D006026:Glycoside Hydrolases; D043325:Xylan Endo-1,3-beta-Xylosidase