Abstract
In this study, a novel β-1,3-1,4-glucanase gene (designated as PtLic16A) from Paecilomyces thermophila was cloned and sequenced. PtLic16A has an open reading frame of 945 bp, encoding 314 amino acids. The deduced amino acid sequence shares the highest identity (61%) with the putative endo-1,3(4)-β-glucanase from Neosartorya fischeri NRRL 181. PtLic16A was cloned into a vector pPIC9K and was expressed successfully in Pichia pastoris as active extracellular β-1,3-1,4-glucanase. The recombinant β-1,3-1,4-glucanase (PtLic16A) was secreted predominantly into the medium which comprised up to 85% of the total extracellular proteins and reached a protein concentration of 9.1 g l−1 with an activity of 55,300 U ml−1 in 5-l fermentor culture. The enzyme was then purified using two steps, ion exchange chromatography, and gel filtration chromatography. The purified enzyme had a molecular mass of 38.5 kDa on SDS–PAGE. It was optimally active at pH 7.0 and a temperature of 70°C. Furthermore, the enzyme exhibited strict specificity for β-1,3-1,4-d-glucans. This is the first report on the cloning and expression of a β-1,3-1,4-glucanase gene from Paecilomyces sp.
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This work was financially supported by the Program for the National Natural Science Foundation of China and New Century Excellent Talents in University (NCET-08-0534).
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Hua, C., Yan, Q., Jiang, Z. et al. High-level expression of a specific β-1,3-1,4-glucanase from the thermophilic fungus Paecilomyces thermophila in Pichia pastoris . Appl Microbiol Biotechnol 88, 509–518 (2010). https://doi.org/10.1007/s00253-010-2759-0
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DOI: https://doi.org/10.1007/s00253-010-2759-0