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Characterization of laccase activity produced by Cryptococcus albidus
Anjali Singhal1, Gaurav Choudhary, Indu Shekhar Thakur
1School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India.
Preparative Biochemistry & Biotechnology
|March 8, 2012
Summary
This study characterizes laccase enzyme from Cryptococcus albidus, finding optimal activity at pH 2.5 and 20-30°C. The enzyme shows stability and varying tolerance to industrial chemicals, crucial for bioremediation applications.
Area of Science:
- Biochemistry
- Enzymology
- Environmental Biotechnology
Background:
- Industrial wastes pose challenges for bioremediation enzymes due to chemical interference.
- Characterizing enzyme stability and activity in the presence of industrial chemicals is vital for effective bioremediation.
- Cryptococcus albidus is a source of laccase enzyme with potential industrial applications.
Purpose of the Study:
- To characterize the laccase enzyme produced by Cryptococcus albidus.
- To investigate the enzyme's activity under varying pH and temperature conditions.
- To assess the impact of industrial chemicals on laccase stability and functionality.
Main Methods:
- Enzyme activity assays using ABTS as a substrate.
- Determination of kinetic parameters (Km and Vmax) following Michaelis-Menten kinetics.
- Thermostability assessment and evaluation of chemical influences (solvents, detergents, inhibitors).
Main Results:
- Laccase exhibited optimal activity at pH 2.5 and temperatures between 20-30°C.
- Michaelis-Menten kinetics were followed with Km = 0.8158 mM and Vmax = 1527.74 U/mg.
- The enzyme demonstrated good thermostability and was unaffected by SDS and EDTA, but inhibited by sodium azide, 2-mercaptoethanol, and high concentrations of organic solvents.
Conclusions:
- Cryptococcus albidus laccase is a robust enzyme with potential for bioremediation in challenging industrial environments.
- Understanding chemical tolerance is key to optimizing laccase application in waste treatment.
- Further research can explore enzyme immobilization or modification for enhanced stability in specific industrial settings.
