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Enhancing RGI lyase thermostability by targeted single point mutations.

Inês R Silva¹, Dorte M Larsen, Carsten Jers

¹Center for Bioprocess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Building 229, 2800, Kongens Lyngby, Denmark.

Applied Microbiology and Biotechnology

|September 3, 2013

Summary

Protein engineering enhanced the thermal stability of Rhamnogalacturonan I lyase (RGI lyase) from Bacillus licheniformis. The best mutant, Glu434Leu, showed a 1.6-fold improvement, enabling pectin biomass processing at higher temperatures.

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Area of Science:

Enzymology
Protein Engineering
Biotechnology

Background:

Rhamnogalacturonan I lyase (RGI lyase) is crucial for degrading pectin, a major component of plant cell walls.
Improving the thermal stability of RGI lyase is essential for efficient enzymatic processing of pectinaceous biomass at elevated temperatures.

Purpose of the Study:

To enhance the thermal stability of a RGI lyase (PL 11) from Bacillus licheniformis using protein engineering.
To identify specific amino acid substitutions that improve enzyme thermostability for industrial applications.

Main Methods:

Site-saturated mutagenesis was employed on nine targeted amino acids.
Predictive modeling, including consensus approach, stability change prediction, and B-factor iteration, guided mutant selection.
Experimental verification of thermal stability for wild-type and mutant RGI lyases was performed.

Main Results:

Several single point mutations significantly improved RGI lyase thermal stability.
The Glu434Leu mutant exhibited a 1.6-fold increase in half-life at 60°C (31 min).
Other effective mutations included Gly55Val, Glu434Trp, Glu434Phe, and Glu434Tyr.

Conclusions:

A combinatorial predictive approach is effective for designing mutant libraries to improve enzyme thermostability.
The developed thermostable RGI lyases are suitable for the enzymatic upgrading of pectinaceous plant biomass at higher temperatures.