Abstract
A low molecular weight endo-xylanase (EC 3.2.1.8) was purified from an edible mushroom Termitomyces clypeatus grown in submerged medium with oat spelt xylan. Xylanase was purified to apparent homogeneity by ammonium sulfate fractionation and gel filtration chromatography. Its molecular weight was determined by gel filtration chromatography and sodium dodecyl sulfate-polyacrylamide gel electrophoresis to be 12 kDa. The enzyme was found to be most active at 50°C and pH 5.0, being most stable at pH 6.5. The Km for oat spelt xylan was determined to be 10.4 mg/ml. The specificities of the enzyme was observed to be highly specific towards oat spelt xylan and was inhibited by mercuric chloride (HgCl2), N-bromosuccinimide, and trans-1,2-diaminocyclohexane-N′,N′,N′,N′-tetraacetic acid strongly. The inhibitory action of N-bromosuccinimide on enzyme confirmed the presence of one tryptophan residue in its substrate-binding site. Amino acid analysis for xylanase showed the presence of high amount of hydrophobic serine, glycine, threonine, and alanine residues. The N-terminal sequencing study for the previously purified and characterized 56 kDa xylanolytic amyloglucosidase reveal the presence of 33.30% identity with glucoamylase chain A from Aspergillus awamori. The N-terminal sequence analysis of the present 12 kDa enzyme showed highest similarity (72.22% identity) towards xylanase from Neurospora crassa.
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Acknowledgements
The authors wish to thank the Director, IICB for financial support from CSIR Network Project No. NWP 0005. Thanks are also due to University Grants Commission for providing financial support. Grateful thanks are due to Dr. R. Majhi, IICB for the help provided during amino acid analysis and N-terminal sequencing.
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Soren, D., Jana, M., Sengupta, S. et al. Purification and Characterization of a Low Molecular Weight Endo-xylanase from Mushroom Termitomyces clypeatus . Appl Biochem Biotechnol 162, 373–389 (2010). https://doi.org/10.1007/s12010-009-8763-0
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DOI: https://doi.org/10.1007/s12010-009-8763-0