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Soluble Production, Characterization, and Structural Aesthetics of an Industrially Important Thermostable β -Glucosidase from Clostridium thermocellum in Escherichia coli .
- Source :
-
BioMed research international [Biomed Res Int] 2019 Nov 07; Vol. 2019, pp. 9308593. Date of Electronic Publication: 2019 Nov 07 (Print Publication: 2019). - Publication Year :
- 2019
-
Abstract
- This study aims to achieve high-level soluble expression and characterization of a thermostable industrially important enzyme, i.e., beta-glucosidase (BglA; EC: 3.2.1.21), from Clostridium thermocellum ( C. thermocellum ) by cloning in an Escherichia coli ( E. coli ) expression system. BglA was expressed as a partially soluble component of total cellular protein (TCP) having a molecular weight of ∼53 kDa with 50% of it as soluble fraction. Purification in two steps, namely, heat inactivation and Ni-chromatography, yielded approximately 30% and 15% of BglA, respectively. The purified (∼98%) BglA enzyme showed promising activity against the salicin substrate having a K <subscript>m</subscript> of 19.83 mM and a V <subscript>max</subscript> of 0.12 μ mol/min. The enzyme had an optimal temperature and pH of 50°C and 7.0, respectively, while retaining its catalytic activity up till 60°C and at pH 7. The optimized maximum expression level was attained in M9NG medium with lactose as an inducer. Circular dichroism revealed presence of alpha helix (43.50%) and small percentage of beta sheets (10.60%). Factors like high-end cellulolytic activity, fair thermal stability, stability against low pH, and ease of purification make BglA from C. thermocellum a potential candidate in industrial applications.<br />Competing Interests: The authors declare no conflicts of interest.<br /> (Copyright © 2019 Syed Shoaib Ahmed et al.)
- Subjects :
- Enzyme Stability
Recombinant Proteins biosynthesis
Recombinant Proteins chemistry
Recombinant Proteins genetics
Recombinant Proteins isolation & purification
Bacterial Proteins biosynthesis
Bacterial Proteins chemistry
Bacterial Proteins genetics
Bacterial Proteins isolation & purification
Cloning, Molecular
Clostridium thermocellum enzymology
Clostridium thermocellum genetics
Escherichia coli enzymology
Escherichia coli genetics
Hot Temperature
beta-Glucosidase biosynthesis
beta-Glucosidase chemistry
beta-Glucosidase genetics
beta-Glucosidase isolation & purification
Subjects
Details
- Language :
- English
- ISSN :
- 2314-6141
- Volume :
- 2019
- Database :
- MEDLINE
- Journal :
- BioMed research international
- Publication Type :
- Academic Journal
- Accession number :
- 31828148
- Full Text :
- https://doi.org/10.1155/2019/9308593