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Related Experiment Videos

Insulin structure and stability

J Brange1, L Langkjoer

  • 1Novo Research Institute, Novo Nordisk A/S, Bagsvaerd, Denmark.

Pharmaceutical Biotechnology
|January 1, 1993
PubMed
Summary
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Insulin stability is crucial for pharmaceutical formulations. Understanding insulin

Area of Science:

  • Biochemistry and Pharmaceutical Sciences
  • Protein Chemistry
  • Drug Formulation

Background:

  • Insulin, a 51-amino acid protein, exists as monomers, dimers, and hexamers.
  • Its three-dimensional structure and stability are influenced by pH, zinc ions, and phenol derivatives.
  • Insulin aggregation into fibrils and chemical degradation are critical issues in pharmaceutical preparations.

Purpose of the Study:

  • To elucidate the structural dynamics and stability factors of insulin.
  • To understand the mechanisms of insulin aggregation and chemical degradation.
  • To identify strategies for stabilizing insulin in pharmaceutical formulations.

Main Methods:

  • Analysis of insulin's three-dimensional structure and conformational states.

Related Experiment Videos

  • Investigation of monomerization, dimerization, and hexamerization processes.
  • Study of chemical degradation pathways, including hydrolysis and deamidation.
  • Examination of factors influencing insulin fibril formation.

    • Main Results:

    • Insulin monomer structure and its two main conformations are influenced by phenol derivatives.
    • Insulin hexamers, utilized in therapy, retain some molecular flexibility.
    • Fibril formation initiates with the exposure of hydrophobic residues upon monomerization.
    • Chemical degradation primarily involves deamidation and backbone cleavage.

    Conclusions:

    • Insulin's physical and chemical stability are governed by B-chain flexibility and resistance to monomerization.
    • Stabilizing insulin involves preventing its disassembly into monomers.
    • Understanding degradation pathways like deamidation is key to improving insulin storage and use.