Superactive β-galactosidase inclusion bodies

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Engineering

Background:

• Bacterial inclusion bodies (IBs) were traditionally viewed as inactive protein aggregates, hindering recombinant protein production.
• Recent findings suggest IBs can contain active protein, challenging previous assumptions.

Purpose of the Study:

• To investigate the functionality and characteristics of recombinant beta-galactosidase inclusion bodies (IBβ-Gal).
• To determine if IBβ-Gal serves as a stable and active enzyme source.

Main Methods:

• Characterization of IBβ-Gal activity under varying pH and temperature conditions.
• Analysis of enzyme release kinetics and associated changes in protein structure and activity.
• Measurement of kinetic parameters (specific activity, Michaelis-Menten constant) during enzyme release.

Main Results:

• Recombinant beta-galactosidase inclusion bodies (IBβ-Gal) were confirmed as functional and highly active enzyme aggregates.
• IBβ-Gal exhibited stability at physiological and acidic pH, and retained activity after high-temperature pre-incubation.
• Enzyme release upon IBβ-Gal washing or dilution resulted in altered kinetic parameters and a shift towards soluble-like secondary structures.

Conclusions:

• Recombinant beta-galactosidase inclusion bodies (IBβ-Gal) function as a packed reservoir of active and stable enzyme.
• The release process from IBβ-Gal yields active enzyme with modified kinetic properties, distinct from the aggregated form.