Phase Control of Nanocrystalline Inclusions in Bioprecipitated Titania with a Panel of Mutant Silica-Binding Proteins
| Autor: | Matthew J. Bailey, François Baneyx, Amy Elizabeth Stegmann, Karthik Pushpavanam, Brittney Hellner |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Anatase
Peptide 02 engineering and technology 010402 general chemistry 01 natural sciences Crystallinity Phase (matter) Electrochemistry Side chain General Materials Science Spectroscopy chemistry.chemical_classification Titanium Precipitation (chemistry) Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Silicon Dioxide 0104 chemical sciences chemistry Chemical engineering Mutant Proteins Crystallite 0210 nano-technology Carrier Proteins Monoclinic crystal system |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 36(29) |
| ISSN: | 1520-5827 |
| Popis: | The biomimetic route to inorganic synthesis presents an opportunity to produce complex materials with superior properties under ambient conditions and from nontoxic precursors. While there has been significant progress in using solid-binding peptides (SBPs), proteins, and organisms to produce a variety of inorganic and hybrid structures, it has been more challenging to understand the interplay of solution conditions and solid-binding peptide (SBP) sequence, structure, and self-association on synthetic outcomes. Here, we show that fusing the Car9 silica-binding peptide-but not the silaffin-derived R5 peptide-to superfolder green fluorescent protein (sfGFP) enhances the ability of micromolar concentrations of protein to induce rapid titania (TiO2) precipitation from acidified solutions of tetrakis(di-lactato)-oxo-titanate (TiBALDH). TiO2 is produced stoichiometrically and although predominantly amorphous, contains nanosized anatase and monoclinic TiO2(B) inclusions. Remarkably, the phase of these nanocrystallites can be tuned from about 80% TiO2(B) to about 65% anatase by using Car9 mutants impaired in their ability to drive the formation of higher-order sfGFP-Car9 oligomers. Our results suggest that the presentation of multiple basic side chains in an extended plane formed by SBP self-association is critical to template the formation of monoclinic crystallites and underscore the subtle influence that single or dual substitutions in dodecameric SBPs can exert on the yield and crystallinity of biomineralized inorganics. |
| Databáze: | OpenAIRE |
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