An alkali-thermostable β-mannanase gene from Bacillus nealsonii PN-11 was cloned by functional screening of E. coli cells transformed with pSMART/HaeIII genomic library. The ORF encoding mannanase consisted of 1100 bp, corresponding to protein of 369 amino acids and has a catalytic domain belonging to glycoside hydrolase family 5.
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