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Conformational changes of enzymes adsorbed at liquid-solid interface: relevance to enzymatic activity
S Noinville1, M Revault, M-H Baron
1Laboratoire de Dynamique, Interactions et Réactivité, CNRS-Université Paris 6, UMR 7075, 2 Rue Henri Dunant, 94320 Thiais, France. sylvie.noinville@glvtcnrs.fr
Biopolymers
|May 16, 2002
Summary
Enzyme adsorption at water-solid interfaces alters enzyme structure and activity. Hydrophobic interactions significantly change enzyme conformation, impacting enzymatic hydrolysis and activity, especially for Humicola lanuginosa lipase.
Area of Science:
- Biochemistry
- Surface Chemistry
- Spectroscopy
Background:
- Enzyme activity is influenced by conformational changes.
- Understanding enzyme adsorption at interfaces is crucial for applications.
Purpose of the Study:
- To investigate enzyme adsorption at water-solid interfaces.
- To correlate conformational changes with enzymatic activity.
Main Methods:
- Fourier-transform infrared (FTIR) spectroscopy with attenuated total reflectance (ATR).
- In situ adsorption studies on hydrophobic and hydrophilic supports.
- Analysis of enzyme secondary structure and solvation.
Main Results:
- Alpha-chymotrypsin showed minor structural changes on hydrophilic supports but significant alterations on hydrophobic supports, inhibiting activity.
- Humicola lanuginosa lipase adsorbed strongly on hydrophobic supports, with specific solvation indicating an open conformer and enhanced activity.
- Enzyme adsorption is dependent on substrate hydrophobicity and electrostatic interactions.
Conclusions:
- Enzyme conformational changes during adsorption are critical for monitoring enzymatic activity.
- Hydrophobic interactions play a key role in enzyme structure and function at interfaces.
- Tailoring support properties can modulate enzyme behavior for specific applications.