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Identification, overexpression, purification, and biochemical characterization of a novel hyperthermostable keratinase from Geoglobus acetivorans

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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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Authors

Contributions

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.

Corresponding author

Correspondence to Nujarin Jongruja.

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The authors declare that they have no conflict of interest in the publication.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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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

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