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Engineered acid-stabile human interferon gamma.

P Kontsek1, G Waschütza, E Kontseková

  • 1Institute of Virology, Slovak Academy of Sciences, Bratislava, 842 46, Slovakia. viruipeko@nic.savba.sk

Cytokine
|June 14, 2000
PubMed
Summary
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Interferon-gamma (IFN-gamma) loses antiviral potency at low pH due to dimer dissociation. Engineering an artificial disulfide bond stabilized the dimer, preserving IFN-gamma bioactivity and antiviral function after acid treatment.

Area of Science:

  • Biochemistry
  • Immunology
  • Protein Engineering

Background:

  • Interferon-gamma (IFN-gamma) is crucial for antiviral immunity.
  • IFN-gamma loses its antiviral potency when exposed to low pH (pH 2).
  • Acid-induced dissociation of IFN-gamma dimers into monomers leads to aggregation and reduced activity.

Purpose of the Study:

  • To engineer acid-stable human IFN-gamma without compromising its specific activity.
  • To investigate methods for preserving IFN-gamma's bioactivity under acidic conditions.

Main Methods:

  • Introduction of an artificial intra-monomer disulfide bond (E7C/S69C) into human IFN-gamma.
  • Treatment of engineered IFN-gamma with pH 2.
  • Assessment of bioactivity and antigenic structure retention post-acid treatment.

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Main Results:

  • The engineered E7C/S69C mutant stabilized the dimeric form of IFN-gamma.
  • The stabilized IFN-gamma retained full bioactivity after exposure to pH 2.
  • Acidification did not alter the antigenic structure of the engineered IFN-gamma, as confirmed by antibody binding.

Conclusions:

  • Acid-stability can be successfully engineered into human IFN-gamma.
  • Stabilizing the dimeric structure via disulfide bonds preserves IFN-gamma's bioactivity and antiviral function under acidic conditions.
  • This engineered IFN-gamma offers potential for improved therapeutic applications where stability is critical.