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Related Experiment Video

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Defining Substrate Specificities for Lipase and Phospholipase Candidates

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Published on: November 23, 2016

Thermostable Bacillus subtilis lipases: in vitro evolution and structural insight.

Shoeb Ahmad¹, Md Zahid Kamal, Rajan Sankaranarayanan

¹Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Uppal Road, Hyderabad-500007, India.

Journal of Molecular Biology

|July 5, 2008

Summary

Directed evolution efficiently generated a highly thermostable lipase in vitro. This strategy combined rigorous screening and stability assessments, yielding six beneficial mutations in two generations that significantly enhanced thermal stability and activity.

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Area of Science:

Biochemistry
Protein Engineering
Molecular Biology

Background:

In vitro evolution is crucial for developing protein variants with enhanced properties not achievable through rational design.
Screening for beneficial mutations in directed evolution is challenging due to neutral or negative mutations obscuring positive ones.

Purpose of the Study:

To develop an efficient strategy for directed evolution to overcome screening limitations and generate thermostable protein variants.
To identify and characterize mutations that enhance lipase thermostability and activity.

Main Methods:

Developed a multi-generation in vitro evolution protocol for a Bacillus subtilis lipase.
Implemented stringent three-tier testing, sequencing, and stability assessments at each generation.
Determined high-resolution crystal structures of key mutants to elucidate structural basis of thermostability.

Main Results:

Identified six stabilizing mutations in two generations, with three mutations per generation, contributing additively to thermostability.
Engineered a lipase variant with a 15°C shift in melting temperature and a millionfold decrease in thermal inactivation rate.
Achieved a 20°C shift in optimum temperature and a two- to fivefold increase in activity between 25-65°C.

Conclusions:

The developed strategy efficiently identifies beneficial mutations for enhanced protein thermostability.
Structural analysis revealed the importance of surface water-mediated ionic networks for increased stability.
This approach is broadly applicable for directed evolution of proteins with improved properties.