Abstract
The goal of this study was to identify and biochemically characterize a novel hyperthermostable keratinase from microorganisms for feather waste degradation. Here, a hyperthermophilic Geoglobus acetivorans keratinase (GacK) gene was chosen based on a search of a sequence database. The selected GacK gene was synthesized, cloned, and successfully expressed without a signal peptide in the E. coli system. A monomer of approximately 58 kDa was obtained in a soluble form and purified. The recombinant GacK displayed the highest activity at an optimum temperature of 100 °C and a pH of 10. The hyperthermostable GacK enzymatic performance remained high even after incubation in nonionic surfactants and the chelating agent EDTA. The residual and keratinolytic activities of GacK, as determined with azocasein and keratin azure used as substrates, remained significantly greater than 80% at 130 °C for 7 h. The kinetic parameters Km and Vmax for azure keratin were 0.41 mg/ml and 875.14 unit/mg, respectively, while those for azocasein were 1.51 mg/ml and 505.32 unit/mg, respectively. The results suggest that the enzyme is among the most hyperthermostable keratinases. Because of its enzymatic characteristics to degrade keratin azure at high temperatures, GacK may potentially be utilized in future industrial applications.
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Abbreviations
- GacK:
-
Geoglobus acetivorans Keratinase
- FpeK:
-
Fervidobacterium pennivorans Keratinase
- BalK:
-
Bacillus licheniformis Keratinase
- StmK :
-
Stenotrophomonas maltophilia Keratinase
- BasK :
-
Bacillus subtilis Keratinase
- KerC:
-
KerC Bacillus subtilis keratinase
- BjbK:
-
Bacillus Sp. JB99 keratinase
- IPTG:
-
Isopropylthiogalactoside
- NaCl:
-
Sodium chloride
- SDS-PAGE:
-
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- Asp:
-
Aspartate
- His:
-
Histidine
- Ser:
-
Serine
- KDa:
-
Kilodalton
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Acknowledgements
Accession numbers: G. acetivorans (FJ216404.1), GacK (accession number for the gene sequence of strain SBH6 is FJ216404 version FJ216404.1), the accession numbers were deposited in GenBank with accession numbers AIY90051.1.
Funding
This research was funded by the Thailand Science Research and Innovation and Office of the Higher Education Commission (contract number MRG6180189). This work was supported by a research fund from the Faculty of Science, King Mongkut’s University of Technology Thonburi, KMUTT Research Fund, and Petchra Pra Jom Klao Ph.D. scholarship.
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DS: performed the experiments and original draft of the manuscript. SR: assisted in performing the experiments. YSA: proofread the manuscript and provided technical writing assistance. TLo: provision of experimental materials and discussion. TLe: technical writing assistance and methodology. YK: data curation and discussion. WY: Provision of experimental materials and discussion. PK: data curation and conceptualization. TR: data curation and conceptualization. KP: funding and Supervision. NJ: funding acquisition, methodology, data curation and supervision.
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Sittipol, D., Rodpan, S., Ajingi, Y.S. et al. Identification, overexpression, purification, and biochemical characterization of a novel hyperthermostable keratinase from Geoglobus acetivorans. 3 Biotech 11, 2 (2021). https://doi.org/10.1007/s13205-020-02538-1
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DOI: https://doi.org/10.1007/s13205-020-02538-1