Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Roles of Carbohydrate-Binding Module (CBM) of an Endo-β-1,4-Glucanase (Cel5L) from Bacillus sp. KD1014 in Thermostability and Small-Substrate Hydrolyzing Activity

  • Lee, Jae Pil (Department of Pharmacy, and Research Institute of Life Pharmaceutical Sciences, Sunchon National University) ;
  • Shin, Eun-Sun (Department of Agricultural Chemistry, Sunchon National University) ;
  • Cho, Min Yeol (Department of Agricultural Chemistry, Sunchon National University) ;
  • Lee, Kyung-Dong (Department of Oriental Medicine Materials, Dongshin University) ;
  • Kim, Hoon (Department of Pharmacy, and Research Institute of Life Pharmaceutical Sciences, Sunchon National University)
  • Received : 2018.10.02
  • Accepted : 2018.10.19
  • Published : 2018.12.28
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Abstract

An endo-${\beta}$-1,4-glucanase gene, cel5L, was cloned using the shot-gun method from Bacillus sp.. The gene, which contained a predicted signal peptide, encoded a protein of 496 amino acid residues, and the molecular mass of the mature Cel5L was estimated to be 51.8 kDa. Cel5L contained a catalytic domain of glycoside hydrolase (GH) family 5 and a carbohydrate-binding module family 3 (CBM_3). Chromatography using HiTrap Q and CHT-II resulted in the isolation of two truncated forms corresponding to 50 (Cel5L-p50) and 35 kDa (Cel5L-p35, CBM_3-deleted form). Both enzymes were optimally active at pH 4.5 and $55^{\circ}C$, but had different half-lives of 4.0 and 22.8 min, respectively, at $70^{\circ}C$. The relative activities of Cel5L-p50 and Cel5L-p35 for barley ${\beta}$-glucan were 377.0 and 246.7%, respectively, compared to those for carboxymethyl-cellulose. The affinity and hydrolysis rate of pNPC by Cel5L-p35 were 1.7 and 3.3 times higher, respectively, than those by Cel5L-p50. Additions of each to a commercial enzyme set increased saccharification of pretreated rice straw powder by 17.5 and 21.0%, respectively. These results suggest CBM_3 is significantly contributing to thermostability, and to affinity and substrate specificity for small substrates, and that these two enzymes could be used as additives to enhance enzymatic saccharification.

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References

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