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- W1561778546 abstract "During growth on xylan and xylose Thermoanaerobacterium saccharolyticum B6A-RI produced endoxylanase, β-xylosidase, arabinofuranosidase, and acetyl esterase, and the first three activities appeared to be produced coordinately. During nonlimiting growth on xylan, these enzyme activities were predominantly cell associated; however, during growth on limiting concentrations of xylan, the majority of endoxylanase activity was extracellular rather than cell associated. Endoxylanase, β-xylosidase, and arabinofuranosidase activities were induced by xylan, xylose, and arabinose, respectively. Acetyl esterase activity was constitutive, and endoxylanase activity was catabolite repressed by glucose. Extracellular endoxylanase existed as a high-molecular-weight complex (molecular weight, more than 10 6 ). When analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and zymograms, the crude endoxylanase complex was composed of at least six activity bands. Endoxylanase was purified by gel filtration with Sephacryl S-300 and affinity chromatography with xylan coupled to Sepharose CL-4B preequilibrated to 45�C with 50 mM sodium acetate buffer (pH 4.0) and eluted with 0.1% soluble xylan. A single area of endoxylanase activity was identified on the zymogram; when this activity was analyzed by SDS-PAGE, it was composed of a major protein with a molecular weight of approximately 160,000 and a minor protein with a molecular weight of approximately 130,000. The endoxylanase activity stained with Schiff's reagent, indicative of glycoproteins, displayed a specific activity of 41 U/mg of protein on xylan, and had pH and temperature optima of 6.0 and 70�C, respectively." @default.
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- W1561778546 date "1993-03-01" @default.
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- W1561778546 title "Regulation and Characterization of Xylanolytic Enzymes of <i>Thermoanaerobacterium saccharolyticum</i> B6A-RI" @default.
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- W1561778546 doi "https://doi.org/10.1128/aem.59.3.763-771.1993" @default.
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