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Updated: Jun 1, 2025
08:04
Preparation of Functional Silica Using a Bioinspired Method
Published on: August 1, 2018
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Directed Evolution of Silicatein Reveals Biomineralization Synergism between Protein Sequences
Toriana N Vigil1, Mary-Jean C Rowson2, Abigail J Frost1
1Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22903, United States.
ACS Omega
|January 20, 2025
Summary
Researchers improved silicatein, a biomineralization protein, for enhanced metal nanoparticle synthesis. Directed evolution revealed that variations in protein sequences, acting together, boost nanoparticle production efficiency.
Area of Science:
- Biochemistry
- Materials Science
- Biotechnology
Background:
- Biomineralization offers a sustainable method for synthesizing metal nanoparticles.
- Silicatein, a protein from marine sponges, facilitates the conversion of inorganic precursors into metal oxide nanoparticles.
Purpose of the Study:
- To investigate the catalytic triad hypothesis in silicatein.
- To enhance silicatein's solubility and kinetics for increased nanoparticle synthesis through directed evolution.
Main Methods:
- Site-directed mutagenesis was performed on catalytic triad residues.
- Recombinant production of silicatein and mutants in Escherichia coli.
- Library generation and survival screening were employed to identify improved mutants.
Main Results:
- Mutagenesis of catalytic triad residues did not eliminate biomineralization activity.
- Several mutant proteins exhibited augmented biomineralization activity.
- Sequence analysis indicated that multiple protein sequences within a single cell contribute to enhanced activity.
Conclusions:
- Silicatein exhibits tolerance to a broad range of sequence variations.
- Synergistic action of multiple silicatein sequences enhances biomineralization.
- Directed evolution is a viable strategy for improving silicatein's nanoparticle synthesis capabilities.
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