Related Experiment Videos
Effects of glucose on lipase activity
W Tsuzuki1, Y Kitamura, T Suzuki
1National Food Research Institute, Ministry of Agriculture, Forestry, and Fisheries, Ibaraki, Japan. wakako@ss.nfri.affrc.go.jp
Bioscience, Biotechnology, and Biochemistry
|September 29, 1999
Summary
Glucose inhibits some microbial lipases, but modification with detergent prevents this. This suggests structural changes in lipase molecules due to glucose interaction, impacting biocatalyst utility.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Lipases are crucial biocatalysts with diverse industrial applications.
- Understanding factors affecting lipase activity, like glucose, is essential for optimizing their use.
Purpose of the Study:
- To investigate the impact of glucose on the hydrolysis activity of various lipases.
- To explore methods for mitigating glucose inhibition of lipase activity.
Main Methods:
- Screening 13 microbial lipases and 2 porcine pancreatic lipases for glucose sensitivity.
- Modifying glucose-sensitive lipases using a synthetic detergent.
- Assessing lipase activity in the presence and absence of glucose.
- Utilizing tryptophan fluorescence to detect lipase-glucose interactions and structural changes.
Main Results:
- Six of 13 microbial lipases showed significant inhibition (up to 50%) by 10 mM glucose.
- Other microbial lipases and porcine pancreatic lipases were unaffected by glucose.
- Modification with detergent rendered sensitive lipases resistant to glucose inhibition, retaining over 95% activity.
- Glucose-dependent changes in tryptophan fluorescence indicated structural alterations in inhibited lipases.
Conclusions:
- Glucose can inhibit specific microbial lipases by inducing structural changes.
- Synthetic detergent modification effectively prevents glucose inhibition, preserving lipase biocatalytic function.
- These findings are critical for the application of lipases in glucose-containing environments.