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Updated: Dec 13, 2025

A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
Published on: November 7, 2012
Sortase mutants with improved protein thermostability and enzymatic activity obtained by consensus design
Magdalena Wójcik1, Susana Vázquez Torres1, Wim J Quax1
1Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, A. Deusinglaan 1, 9713 Groningen, The Netherlands.
Researchers improved Staphylococcus aureus sortase A (SaSrtA) enzyme activity and stability. New SaSrtA variants are Ca2+-independent, enabling new biotechnology applications in low calcium environments.
Area of Science:
- Biochemistry
- Molecular Biology
- Biotechnology
Background:
- Staphylococcus aureus sortase A (SaSrtA) anchors proteins to Gram-positive bacterial cell surfaces via transpeptidation.
- SaSrtA facilitates in vitro protein ligation, offering biotechnological applications.
- Native SaSrtA exhibits limitations including low activity and calcium (Ca2+) dependence.
Purpose of the Study:
- To enhance the stability and activity of Staphylococcus aureus sortase A (SaSrtA).
- To develop Ca2+-independent SaSrtA variants for broader biotechnological use.
Main Methods:
- Evaluated the thermodynamic stability of wild-type SaSrtA.
- Employed consensus analysis to engineer improved SaSrtA mutants.
- Assessed the activity and Ca2+ dependence of engineered variants.
Main Results:
- Wild-type SaSrtA demonstrated good thermodynamic stability.
- Consensus analysis yielded SaSrtA mutants with enhanced stability and activity.
- Developed Ca2+-independent SaSrtA variants.
Conclusions:
- Engineered SaSrtA variants overcome limitations of the wild-type enzyme.
- Improved SaSrtA mutants offer increased activity and Ca2+ independence.
- These novel variants are suitable for conjugation reactions in low Ca2+ conditions.
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