Cloning, Expression, Characterization and Immobilization of a Recombinant Carboxylesterase from the Halophilic Archaeon, Halobacterium salinarum NCR-1
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Summary
This summary is machine-generated.This study reports the successful expression and purification of a novel halophilic archaeal carboxylesterase (rHsEst). Immobilization enhanced its stability and activity, highlighting its potential as an industrial biocatalyst.
Area Of Science
- Biochemistry
- Enzymology
- Extremophile Biology
Background
- Limited research exists on halophilic archaeal carboxylesterases due to low native production.
- Archaeal esterases are underexplored for their biocatalytic potential.
Purpose Of The Study
- To clone and express a carboxylesterase gene from *Halobacterium salinarum* NRC-1 in *Haloferax volcanii*.
- To characterize the biochemical properties of the recombinant enzyme (rHsEst) and its immobilized form.
- To evaluate the potential of immobilized rHsEst as an industrial biocatalyst.
Main Methods
- Gene cloning and heterologous expression in *Haloferax volcanii*.
- Purification of recombinant carboxylesterase (rHsEst) via affinity chromatography.
- Enzyme characterization including kinetic analysis, stability studies, and immobilization on Celite 545.
- Assessment of optimal pH, temperature, and salt tolerance.
Main Results
- Recombinant carboxylesterase (rHsEst) was successfully purified with high yield and characterized (33 kDa).
- rHsEst demonstrated optimal activity at pH 8 and stability towards metal ions and organic solvents.
- Immobilization significantly enhanced rHsEst's thermostability, halophilicity (active up to 5M NaCl), and resistance to inhibitors.
- Serine residue identified in the active site via PMSF inhibition.
Conclusions
- The heterologous expression and characterization of rHsEst provide valuable insights into halophilic archaeal esterases.
- Immobilized rHsEst exhibits remarkable stability and activity under harsh conditions, including high salt concentrations.
- These properties position immobilized rHsEst as a promising biocatalyst for diverse industrial applications.
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