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Preparation of Functional Silica Using a Bioinspired Method

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Published on: August 1, 2018

R5 Peptides Constitute Condensed Phases with Liquid-Like Properties in Biomimetic Silica Capsules.

Dörte Brandis^1,2, Giulia Mollica³, Dennis Kurzbach¹

¹Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria.

The Journal of Physical Chemistry Letters

|April 23, 2025

Summary

Biomimetic silica-peptide nanocomposites show dynamic R5 peptide scaffolds, crucial for drug delivery. Understanding these dynamics enables better design of advanced nanomaterials.

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Area of Science:

Biomaterials Science
Nanotechnology
Biochemistry

Background:

Biomimetic silica-peptide nanocomposites offer potential in drug delivery and enzyme encapsulation.
The structural dynamics of peptide scaffolds in these nanocomposites are not well understood, hindering material design.
Existing methods struggle to analyze heterogeneous systems with diverse timescales.

Purpose of the Study:

To investigate the structural dynamics of the R5 peptide within its self-assemblies and silica-templated particles.
To characterize the dynamic behavior of the R5 peptide scaffold before and after silica encapsulation.
To elucidate the relationship between peptide dynamics and the functionality of R5-silica nanocomposites.

Main Methods:

Utilized advanced magnetic resonance techniques: 13C-direct detected NMR, site-directive spin-labeling EPR, and sensitivity-enhanced solid-state NMR.
Analyzed R5 peptide dynamics across a wide range of timescales within silica composites.
Investigated R5 self-assemblies and silica-encapsulated structures.

Main Results:

R5 peptide self-assemblies exhibit condensed phases with liquid-like dynamics.
R5 peptides within silica particles retain significant internal dynamics, showing distinct solid-like and liquid-like regions.
Identified three dynamic species: solid-like at the interface, liquid-like in the core, and intermediate at boundaries.

Conclusions:

The dynamic nature of the R5 peptide scaffold explains the high mobility of guest molecules within R5-silica nanoparticles.
Findings provide a basis for rational design of advanced nanomaterials for controlled release and catalysis.
The methodological approach advances understanding of biomimetic mineralization and peptide-guided biominerals.