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β-galactosidase stability at high substrate concentrations.

Anja Warmerdam1, Remko M Boom, Anja Em Janssen

  • 1Food Process Engineering Group, Wageningen University, PO Box 8129, Wageningen, EV 6700 The Netherlands.

Springerplus
|September 12, 2013
PubMed
Summary

Enzyme stability for galacto-oligosaccharide synthesis is crucial. Higher initial lactose concentrations significantly enhance beta-galactosidase stability, contrary to buffer conditions, impacting yield optimization.

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Area of Science:

  • Biocatalysis
  • Enzyme kinetics
  • Carbohydrate chemistry

Background:

  • Enzymatic synthesis of galacto-oligosaccharides (GOS) often uses high substrate concentrations for improved yields.
  • Understanding enzyme stability under reaction conditions is vital for process optimization.
  • Beta-galactosidase from Bacillus circulans is a key enzyme for GOS production.

Purpose of the Study:

  • To investigate the stability of Bacillus circulans beta-galactosidase.
  • To evaluate enzyme stability at different temperatures (25, 40, 60°C).
  • To compare enzyme stability in buffer versus high lactose concentrations (5.0% and 30% w/w).

Main Methods:

  • Enzyme stability assays were conducted in buffer and varying lactose concentrations.
  • A mechanistic model was employed to correct enzyme activity measurements.
Keywords:
Bacillus circulansConcentrated systemsEnzyme activityEnzyme stabilityGalacto-oligosaccharidesβ-galactosidase

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  • Correction accounted for the presence of lactose, glucose, galactose, and oligosaccharides.
  • Inactivation kinetics (kd) and energy (Ea) were determined.

    • Main Results:

    • Enzyme half-life in buffer was 220h (25°C) and 13h (40°C); inactivation occurred within 2h at 60°C.
    • High lactose concentrations (5.0% and 30% w/w) significantly increased enzyme stability.
    • Correction for assay components revealed over/underestimation of stability without it.
    • Inactivation constant (kd) showed less temperature dependence at high substrate levels.
    • Inactivation energy (Ea) was lower at high initial substrate concentrations.

    Conclusions:

    • Enzyme stability is highly dependent on initial substrate concentration, increasing significantly with higher lactose levels.
    • High substrate concentrations stabilize beta-galactosidase, reducing temperature-dependent inactivation.
    • Accurate assessment of enzyme activity and stability requires accounting for reaction components in the assay mixture.
    • Findings support optimizing GOS production by utilizing high initial lactose concentrations for enhanced enzyme performance.