Abstract
Ten xylanase isoforms produced by Myceliophthora sp. were characterized for their ability to bind to avicel. Three of the xylanases showing differential affinity for avicel were purified by column chromatography. The purified xylanase Xyl IIa, IIb and IIc showed molecular mass of 47, 41 and 30 kDa and pI of ∼3.5, 4.8 and 5.2, respectively. Xyl IIa was optimally active at pH 8.0 and temperature 70 °C, while Xyl IIb and IIc were optimally active at pH 9.0 and 60 °C and 7.0 and 80 °C, respectively. Xyl IIa and Xyl IIb showed higher stability under alkaline conditions (pH 9.0) and retained 80% of the original activity upto 1 h and 3 h respectively, at 50 °C. All three purified iso-xylanases showed enhanced activities in presence of Na+, Mg2+, Mn2+ and K+ ions, whereas, Zn2+ and Cu2+ showed negative effect on Xyl IIa. The activity of Xyl IIa increased in presence of reducing agents DTT and mercaptoethanol, however, SDS showed inhibitory effect. Kinetic studies showed that Xyl IIb and IIc degrade rye arabinoxylan, much more efficiently than oat spelt xylan, whereas, Xyl IIa showed much higher Kcat/Km value for birch wood xylan as compared to oat spelt xylan. The purified xylanases were apparently classified in family 10.
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The financial support to BSC by Department of Biotechnology, Ministry of Science & Technology; Government of India is duly acknowledged.
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Badhan, A.K., Chadha, B.S. & Saini, H.S. Purification of the alkaliphilic xylanases from Myceliophthora sp. IMI 387099 using cellulose-binding domain as an affinity tag. World J Microbiol Biotechnol 24, 973–981 (2008). https://doi.org/10.1007/s11274-007-9561-x
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DOI: https://doi.org/10.1007/s11274-007-9561-x