Related Experiment Video
Updated: Aug 5, 2026
12:07
Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
Published on: October 9, 2021
Tryptophan Residues' Incorporation Modulates Ferritin Thermal Stability and Hydrophobicity
Luisa Affatigato1, Sara Anselmo1, Anna Fricano1
1Department of Physics and Chemistry-Emilio Segrè, University of Palermo, 90128 Palermo, Italy.
Current Issues in Molecular Biology
|July 28, 2026
Summary
Engineered ferritin protein cages with modified inner cavities show altered thermal stability. These ferritin drug delivery platforms can be tuned for enhanced biomedical applications.
Area of Science:
- Biochemistry
- Materials Science
- Nanotechnology
Background:
- Ferritin is a biocompatible iron-storage protein with a hollow nanocage structure suitable for drug delivery.
- Engineered ferritin mutants offer potential for enhanced therapeutic cargo encapsulation and protection.
- Previous studies characterized baseline properties of engineered ferritin variants.
Purpose of the Study:
- To compare the thermal stability profiles of two distinct human H-chain ferritin mutants.
- To investigate the impact of internal cavity tryptophan residue modifications on ferritin stability.
- To assess how modulating internal cavity composition affects ferritin's physicochemical properties.
Main Methods:
- Site-directed mutagenesis was used to create ferritin variants with altered tryptophan content in the inner cavity.
- Temperature-dependent changes in surface hydrophobicity and solvent accessibility were measured.
- The environment-sensitive fluorescent dye ANS was employed to probe conformational changes.
Main Results:
- The two distinct ferritin mutants exhibited different thermal stability profiles.
- Modifications to the inner cavity composition influenced surface hydrophobicity and solvent accessibility.
- Targeted mutations affected the conformational behavior of the ferritin nanocage.
Conclusions:
- Targeted modulation of ferritin's internal cavity composition can tune its physicochemical properties and stability.
- These findings provide insights for the rational design of ferritin-based nanoplatforms.
- Engineered ferritin holds promise for advanced biomedical and drug delivery applications.
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