Electric field control of lipase membrane activity

Area of Science:

• Biochemistry
• Materials Science
• Enzyme Engineering

Background:

• Immobilized enzymes offer advantages in biocatalysis.
• Controlling enzyme activity is crucial for advanced bioreactor applications.
• Liquid crystals can be used as matrices for enzyme immobilization.

Purpose of the Study:

• To investigate the effect of an electric field on the activity of lipase immobilized in a liquid crystal collagen membrane.
• To explore the potential of electric field-induced enzyme activation for controllable bioreactor devices.

Main Methods:

• Lipase (Pseudomonas sp.) was entrapped in a collagen membrane containing the liquid crystal 4-methoxybenzilidene-4'-n-butylaniline.
• Enzyme activity was measured with and without an applied electric field (4 V).
• The relationship between enzyme activity and current, and the apparent Michaelis constant (K'm) were analyzed.

Main Results:

• A 4V electric field increased lipase activity by 3.4-fold compared to the control.
• A linear correlation was found between enzyme activity and current.
• The apparent Michaelis constant (K'm) remained unchanged under electric field.
• Enzyme activation was reversible and repeatable upon electric field application and removal.

Conclusions:

• Electric field stimulation provides a method for reversible, on-demand activation of immobilized lipase.
• This controllable enzyme activation is promising for developing switching devices in bioreactors.
• Further investigation into the mechanisms of electric field-induced lipase activation is warranted.