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- W202458645 abstract "Various organisms are known to produce hierarchically organised ornate biosilica structures in vivo with great fidelity. In several recent studies it has been proposed that the controlled moulding of biosilicas is regulated by biomolecules such as peptides, proteins and polysaccharides. However, the mechanisms underpinning biomolecule mediated biosilici-fication and the interactions of 'silicon' with biomolecules remain unclear. The aim of this paper is to carry out model studies of silicification with the intention of probing the interactions between biological molecules derived from biosilicifying organisms with silica. We present a detailed study of silica formation in the presence of a recombinant silicatein protein (derived from the sponge Suberites domuncula) and an R5 peptide (derived from silaffin proteins isolated from the diatom Cylindrotheca fusiformis). We have also undertaken model studies of silica formation using recombinant proteins of known primary and secondary structure and pI to investigate the effect that structure has on structure development from solution. A silicon-catecholate complex was used that liberates silicic acid under circumneutral pH. The kinetics of silicic acid polymerisation was monitored using a colorimetric method. The aggregation of polysilicic acid oligomers and particle growth was studied using dynamic light scattering. The nature of the solid materials formed was investigated by electron microscopy - transmission electron microscopy to study the sizes of the fundamental particles and scanning electron microscopy to study the morphology of aggregates. In order to assess surface area, porosity and pore size distributions, gas adsorption analysis was performed. Thermal analysis was used to quantify the amount of organic material entrapped into silicas, which may originate from the catechol released after decomposition of the silicon complex or from the protein or peptide added to the reaction mixture. It was found that these functional additives affect all aspects of silicic acid polymerisation. In particular, the aforesaid proteins/peptides were able to control the kinetics of silica polymerisation. In addition, most of these additives modulated the surface area and pore size distribution of the silicas prepared in their presence." @default.
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- W202458645 date "2007-08-02" @default.
- W202458645 modified "2023-10-02" @default.
- W202458645 title "The Interaction of 'Silicon' with Proteins: Part 2. The Rold of Bioinspired Peptide and Recombinant Proteins in Silica Polymerization" @default.
- W202458645 doi "https://doi.org/10.1021/bk-2007-0964.ch021" @default.
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