Overview
Apoferritin is the protein component of ferritin that forms a hollow nanocage structure after iron removal. Found ubiquitously in nature, it serves as the biological template for iron storage in organisms ranging from bacteria to humans. The protein shell consists of 24 subunits that self-assemble into a spherical structure with 8nm internal diameter and 12nm external diameter. In biomedical research, apoferritin's unique structure and biocompatibility make it valuable for nanotechnology applications. Its ability to reversibly assemble/disassemble under pH changes allows for controlled loading of cargo molecules. Unlike ferritin, apoferritin contains no mineralized iron core, making it ideal for studying the protein's intrinsic properties.
Physical and Chemical Properties
Apoferritin maintains ferritin's quaternary structure - 24 subunits (heavy and light chains in mammals) arranged with 432 symmetry. The protein shell contains hydrophilic channels at 3-fold and 4-fold axes that regulate iron entry/exit. Its isoelectric point typically ranges from 4.5-5.5 depending on species. The protein demonstrates remarkable thermal stability (up to 60-70°C) and pH stability (pH 2-10 for short exposures). Dynamic light scattering typically shows a hydrodynamic diameter of 12-13nm. The empty cavity can accommodate various molecules including drugs, contrast agents, and nanoparticles through pH-dependent disassembly/reassembly protocols.
Main Applications
In drug delivery, apoferritin's nanocage structure enables encapsulation of chemotherapeutics (doxorubicin, cisplatin) with enhanced tumor targeting via transferrin receptor 1 (TfR1) binding. Its small size facilitates EPR effect-mediated tumor accumulation. Diagnostically, apoferritin serves as a template for developing MRI contrast agents by loading gadolinium or manganese. Researchers also utilize it to study iron metabolism disorders and neurodegenerative diseases. Emerging applications include vaccine development (antigen presentation) and catalytic nanoreactors by encapsulating enzymes.
Safety and Storage
Apoferritin poses minimal biological risk but should be handled using standard protein precautions - wear gloves, avoid inhalation of lyophilized powder, and use RNase/DNase-free tubes for molecular biology applications. For storage, lyophilized powder remains stable for years at -20°C. Reconstituted solutions should be aliquoted to avoid freeze-thaw cycles, with short-term storage at 4°C (1-2 weeks) or long-term at -80°C (months to years). Always centrifuge before use if precipitation occurs. Buffer systems typically include 150mM NaCl with 20mM HEPES or Tris at neutral pH.
B2B Procurement Guide
When sourcing apoferritin, specify: (1) Species origin (human, horse, recombinant E. coli), (2) Purity level (SDS-PAGE >90% for most applications), (3) Endotoxin levels (<1EU/mg for in vivo use), and (4) Characterization data (DLS, TEM). Suppliers typically provide certificates of analysis including HPLC purity, molecular weight verification, and iron content (<3 atoms/molecule for apoferritin). Bulk quantities (gram scale) often require custom production with 8-12 week lead times. For pharmaceutical applications, ensure GMP-grade material with full documentation of purification processes and viral clearance validation.
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