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  • Title: A new xylanase from a Trichoderma harzianum strain.
    Author: de Paula Silveira FQ, Sousa MV, Ricart CA, Milagres AM, de Medeiros CL, Filho EX.
    Journal: J Ind Microbiol Biotechnol; 1999 Jul; 23(1):682-5. PubMed ID: 10455501.
    Abstract:
    A new xylanase (XYL2) was purified from solid-state cultures of Trichoderma harzianum strain C by ultrafiltration and gel filtration. SDS-PAGE of the xylanase showed an apparent homogeneity and molecular weight of 18 kDa. It had the highest activity at pH 5.0 and 45 degrees C and was stable at 50 degrees C and pH 5.0 up to 4 h xylanase. XYL2 had a low Km with insoluble oat spelt xylan as substrate. Compared to the amino acid composition of xylanases from Trichoderma spp, xylanase XYL2 presented a high content of glutamate/glutamine, phenylalanine and cysteine, and a low content of serine. Xylanase XYL2 improved the delignification and selectivity of unbleached hardwood kraft pulp.
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