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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 24, No. 1, 2016, pp. 56-62
Bioline Code: ej16061
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 24, No. 1, 2016, pp. 56-62

 en A novel pH-stable, endoglucanase (JqCel5A) isolated from a salt-lake microorganism, Jonesia quinghaiensis check for this species in other resources
Lin, Ling; Liu, Xiaozhou; Zhou, Yating; Guan, Linyan; He, Jiajia & Huang, Weiqian


Background: Endoglucanase, one of three type cellulases, can randomly cleave internal β-1,4-linkages in cellulose polymers. Thus, it could be applied in agricultural and industrial processes.
Results: A novel endoglucanase gene (JqCel5A) was cloned from Jonesia quinghaiensis and functionally expressed in Escherichia coli check for this species in other resources Rosetta (DE3). It contained 1722 bp and encoded a 573-residue polypeptide consisting of a catalytic domain of glycoside hydrolase family 5 (GH5) and a type 2 carbohydrate-binding module (CBM2), together with a predicted molecular mass of 61.79 kD. The purified JqCel5A displayed maximum activity at 55°C and pH 7.0, with 21.7 U/mg, 26.19 U/mg and 4.81 U/mg towards the substrate carboxymethyl cellulose, barley glucan and filter paper, respectively. Interestingly, JqCel5A exhibited high pH stability over a broad pH range of pH (3–11), and had good tolerance to a wide variety of deleterious chemicals including heavy metals and detergent. The catalytic mechanism of JqCel5A was also investigated by site mutagenesis and homology-modeling in this study.
Conclusions: It was believed that these properties might make JqCel5A to be potentially used in the suitable industrial catalytic condition, which has a broad pH fluctuation and/or chemical disturbance.

Protein modeling; Site-directed mutagenesis; Cellulases; Recombinant endoglucanase gene; Catalytic domain of glycoside hydrolase; Carbohydrate-binding module; High pH stability; Tolerance to deleterious chemicals; Tolerance to heavy metals; Tolerance to detergents

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