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Investigating Lipase/Stain Interactions: Determining Interfacial Protein Conformation with Surface Spectroscopy.
Khezar H Saeed1, Kris Strunge1, Kasper B Pedersen1
1Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark.
The Journal of Physical Chemistry. B
|August 19, 2024
Summary
This study reveals how Thermomyces lanuginosus lipase (TLL) changes shape at interfaces using VSFG spectroscopy. Understanding these protein structural changes is key for enzyme design and drug discovery.
Area of Science:
- Biophysics
- Biochemistry
- Spectroscopy
Background:
- Conventional methods struggle to analyze protein structures at interfaces.
- Interfacial activation in lipases involves a lid movement exposing the catalytic site upon surface contact.
Purpose of the Study:
- To probe the conformation of Thermomyces lanuginosus lipase (TLL) at hydrophobic interfaces.
- To understand the structural changes associated with lipase interfacial activation.
Main Methods:
- Utilized vibrational sum frequency generation (VSFG) spectroscopy, a surface-specific technique.
- Monitored TLL-catalyzed reactions at the air/water interface.
- Compared experimental and calculated VSFG spectra to analyze amide I band changes.
Main Results:
- VSFG spectroscopy directly observed TLL conformation changes at hydrophobic interfaces.
- Detected the loss of ester carbonyl modes and appearance of carboxylate modes during catalysis.
- Identified subtle structural changes related to lid-opening and determined a likely orientation of the lid-open state.
Conclusions:
- VSFG spectroscopy provides a framework for studying protein structure and function at interfaces.
- This approach can advance enzyme design for biotechnology and drug discovery for membrane-associated proteins.
