Production, Purification, and Characterization of beta-(1-4)-Endoxylanase of Streptomyces roseiscleroticus.
Twelve species of Streptomyces that formerly belonged to the genus Chainia were screened for the production of xylanase and cellulase. One species, Streptomyces roseiscleroticus (Chainia rosea) NRRL B-11019, produced up to 16.2 IU of xylanase per ml in 48 h. A xylanase from S. roseiscleroticus was purified and characterized. The enzyme was a debranching beta-(1-4)-endoxylanase showing high activity on xylan but essentially no activity against acid-swollen (Walseth) cellulose. It had a very low apparent molecular weight of 5,500 by native gel filtration, but its denatured molecular weight was 22,600 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It had an isoelectric point of 9.5. The pH and temperature optima for hydrolysis of arabinoxylan were 6.5 to 7.0 and 60 degrees C, respectively, and more than 75% of the optimum enzyme activity was retained at pH 8.0. The xylanase had a K(m) of 7.9 mg/ml and an apparent V(max) of 305 mumol . min . mg of protein. The hydrolysis rate was linear for xylan concentrations of less than 4 mg/ml, but significant inhibition was observed at xylan concentrations of more than 10 mg/ml. The predominant products of arabinoxylan hydrolysis included arabinose, xylobiose, and xylotriose.
Grabski
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Institute for Microbial and Biochemical Technology, Forest Products Laboratory, Forest Service, U.S. Department of Agriculture, Madison, Wisconsin 53705-2398.
Jeffries
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