One-step, inexpensive high yield strategy for Candida antarctica lipase A isolation using hydroxyapatite

Area of Science:

• Biochemistry
• Enzymology
• Protein Purification

Background:

• Lipase A from Candida antarctica (CAL A) is a valuable enzyme for various biotechnological applications.
• Efficient purification methods are crucial for obtaining active and homogeneous enzyme preparations.
• Understanding enzyme stability and activity under different conditions is essential for its industrial use.

Purpose of the Study:

• To develop a rapid and efficient single-step purification protocol for CAL A.
• To characterize the biochemical properties and stability of the purified CAL A.
• To assess the impact of metal ions and detergents on CAL A activity and stability.

Main Methods:

• Purification of CAL A using hydroxyapatite (HAP) chromatography in a single step.
• Enzyme activity assay and specific activity determination.
• Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for purity assessment.
• Characterization of enzyme stability and activity in the presence of metal ions and detergents.

Main Results:

• A single-step HAP chromatography protocol yielded homogeneous CAL A with 3.74-fold purification and 94.7% recovery.
• Purified CAL A exhibited a specific activity of 400.83 U/mg and a molecular weight of 45 kDa.
• The enzyme showed optimal activity at 60°C, was stimulated by Fe(2+), and was destabilized by most divalent metal ions.
• Low concentrations (0.1%) of most detergents did not affect activity, but higher concentrations (1%) were destabilizing, except for Triton X-100.

Conclusions:

• Hydroxyapatite chromatography provides an effective single-step method for purifying CAL A.
• The purified CAL A demonstrates significant specific activity and a defined optimal temperature.
• Understanding the influence of metal ions and detergents is critical for optimizing CAL A applications in various industrial processes.