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Published on: January 16, 2016
Structure, Stability, and Activity of Adsorbed Enzymes
1Department of Physical and Colloid Chemistry, Wageningen Agricultural University, Wageningen, 6700 EK, The Netherlands
Journal of Colloid and Interface Science
|June 15, 1997
Summary
Enzyme adsorption on surfaces alters protein structure and stability. Hydrophobic Teflon enhanced alpha-chymotrypsin helicity and stability, while hydrophilic silica reduced it for both enzymes, affecting their activity.
Area of Science:
- Biochemistry and Biophysics
- Surface Science
- Enzyme Engineering
Background:
- Enzyme immobilization is crucial for industrial applications, influencing enzyme structure, stability, and activity.
- Understanding protein-surface interactions is key to designing effective immobilization strategies.
Purpose of the Study:
- To investigate the impact of surface hydrophobicity on enzyme structure, thermal stability, and activity.
- To compare the adsorption behavior of a proteolytic enzyme (alpha-chymotrypsin) and a lipolytic enzyme (cutinase) on different surfaces.
Main Methods:
- Enzyme adsorption onto hydrophobic Teflon and hydrophilic silica surfaces from aqueous solutions.
- Circular dichroism (CD) spectroscopy to probe protein secondary structure.
- Differential scanning calorimetry (DSC) to assess thermal stability and conformational heterogeneity.
- Enzymatic activity assays to measure catalytic performance in the adsorbed state.
Main Results:
- Teflon promoted helical structure in alpha-chymotrypsin but reduced it in cutinase.
- Enzymes adsorbed on Teflon exhibited remarkable thermal stability up to 100°C.
- Silica surface adsorption led to a loss of helix content in both enzymes, resulting in heterogeneous conformational states.
- Adsorbed enzyme activity correlated with the fraction of native-like conformations on the silica surface.
Conclusions:
- Surface properties significantly influence enzyme structure, stability, and activity.
- Hydrophobic surfaces can enhance enzyme stability, while hydrophilic surfaces may lead to conformational changes impacting activity.
- The degree of native-like conformation in adsorbed enzymes is a critical determinant of their functional performance.
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