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A Novel Hyperthermostable Recombinant Protein Nanocage

Yaghoub Ahmadyousefi1,2, Massoud Saidijam1,2, Bagher Amirheidari3,4

  • 1Department of Medical Biotechnology, School of Advanced Medical Sciences and Technologies, Hamadan University of Medical Sciences, Hamadan, Iran.

Iranian Biomedical Journal
|November 28, 2022
PubMed
Summary

Maize ferritin (ZmFer1) forms a stable nanocage structure, retaining function even after heat treatment up to 100°C. This hyperthermostable protein nanocage shows promise for nanobiotechnology applications.

Keywords:
FerritinsProtein StabilityProteinsThermotolerance

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Structural Biology

Background:

  • Ferritin's crucial role in cellular iron storage.
  • Nanocage structure and self-assembly properties offer broad nanobiotechnology applications.

Purpose of the Study:

  • To clone and characterize the maize ferritin gene ZmFer1.
  • To investigate the heat stability and functional integrity of ZmFer1 protein nanocages.

Main Methods:

  • Cloning and expression of ZmFer1 in E. coli.
  • Analysis of structural changes using native PAGE, DLS, and TEM.
  • Secondary structure and conformation analysis via CD, UV-Vis, and fluorescence spectroscopy.
  • Thermal stability determination using DSC and assessment of iron-loading capacity.

Main Results:

  • Purified ZmFer1 exhibited a stable homopolymer nanocage structure.
  • ZmFer1 nanocages remained stable up to 90°C, with some integrity at 100°C.
  • Melting temperature (Tm) of ZmFer1 was 81.9°C; heat-treated nanocages retained iron-storage function.

Conclusions:

  • Recombinant ZmFer1 is a hyperthermostable protein nanocage with a Tm > 80°C.
  • Demonstrates potential for developing temperature-resilient protein cages.
  • Highlights ZmFer1's utility in nanobiotechnology, biomaterials, and biomedical fields.