Journal
NANOSCALE
Volume 13, Issue 27, Pages 11932-11942Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nr01632f
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Funding
- Team Programme of the Foundation for Polish Science
- European Union under the European Regional Development Fund [TEAM/2016-3/23]
- HOMING program of the Foundation for Polish Science [HOMING/2017-3/22]
- European Union under the European Regional Development Fund
- Ramalingaswami Fellowship from the Department of Biotechnology, India [BT/RLF/Re-entry/09/2019]
- Foundation for Polish Science [4/6]
- European Union [730872]
- BioS Priority Research Area under the program Excellence Initiative - Research University at the Jagiellonian University in Krakow
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Cage forming proteins, like the ferritin from the hyperthermophile bacterium Thermotoga maritima, show potential biocompatibility for cargo access and encapsulation under mild conditions. By studying the crystal structure of wild type TmFtn and mutants, researchers can identify interfacial amino acids crucial for controlling assembly, deepening our understanding of ferritin complex assembly and moving towards triggerable ferritins with finely designed and controlled properties.
Cage forming proteins have numerous potential applications in biomedicine and biotechnology, where the iron storage ferritin is a widely used example. However, controlling ferritin cage assembly/disassembly remains challenging, typically requiring extreme conditions incompatible with many desirable cargoes, particularly for more fragile biopharmaceuticals. Recently, a ferritin from the hyperthermophile bacterium Thermotoga maritima (TmFtn) has been shown to have reversible assembly under mild conditions, offering greater potential biocompatibility in terms of cargo access and encapsulation. Like Archeoglobus fulgidus ferritin (AfFtn), TmFtn forms 24mer cages mediated by metal ions (Mg2+). We have solved the crystal structure of the wild type TmFtn and several mutants displaying different assembly/disassembly properties. These data combined with other biophysical studies allow us to suggest candidate interfacial amino acids crucial in controlling assembly. This work deepens our understanding of how these ferritin complexes assemble and is a useful step towards production of triggerable ferritins in which these properties can be finely designed and controlled.
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