Cloning of xylanase II (XynII) gene
An expressed sequence tag (EST) was obtained previously through EST sequencing of a V. volvacea cDNA library constructed from mRNA isolated from mycelia of strain V14 grown on rice straw compost. Based on a BLAST search against recent GenBank releases, this EST sequence showed homology to xylanase. The gene-specific primer
50 -GCGCTTGGCGAGGGCAACAATTTCGT-30 based on
the EST sequence was designed to generate the 50 - end DNA fragment coding for XynII by rapid amplification of cDNA ends (RACE)—PCR using the SMART RACE cDNA Amplification Kit (Clontech, Palo Alto, CA, USA). The 50 - cDNA end fragment was subcloned into the pGEM-T vector and sequenced. The full-length cDNA of xynII was then generated by 30 - RACE using the gene- specific primer 50 -GGGAGGCATCACCCAGCTTCTTCG TACC-30 designed from the sequence of the extreme
50 - end of xynII, and sequenced as above.