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Related Experiment Videos

Cytochrome c unfolding on an anionic surface.

C W Herbold1, J H Miller, S C Goheen

  • 1Department of Chemical Sciences, Pacific Northwest National Laboratory, Richland, WA 99352, USA.

Journal of Chromatography. A
|December 11, 1999
PubMed
Summary
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Protein adsorption on surfaces can cause unfolding. This study shows horse heart cytochrome c unfolds at lower temperatures on anionic supports, acting as a catalyst for protein unfolding.

Area of Science:

  • Biochemistry
  • Surface Science
  • Protein Chemistry

Background:

  • Protein adsorption to solid supports can induce structural changes, including unfolding.
  • Understanding surface-mediated unfolding is crucial for applications in biotechnology and medicine.
  • Horse heart cytochrome c is a well-characterized protein model for studying these phenomena.

Purpose of the Study:

  • To investigate the characteristics of protein adsorption and surface-mediated unfolding under near-physiological conditions.
  • To examine the effect of temperature on the adsorption and unfolding of cytochrome c on an anionic support.
  • To determine if anionic surfaces can catalyze protein unfolding at lower temperatures than in solution.

Main Methods:

  • Utilized high-performance liquid chromatography (HPLC) to analyze protein-support interactions.

Related Experiment Videos

  • Employed a NaCl gradient to desorb cytochrome c from an anionic support at varying temperatures.
  • Monitored protein retention times and profiles to assess adhesive properties and structural changes.

    • Main Results:

    • Increased protein retention with time observed even at 0 degrees C.
    • Significant loss of cytochrome c recovery between 55 degrees C and 70 degrees C, indicating irreversible unfolding.
    • Changes in retention times suggest reversible unfolding and structural perturbations at lower temperatures compared to solution.

    Conclusions:

    • Anionic surfaces can promote structural changes and unfolding of cytochrome c at lower temperatures than observed in solution.
    • These surfaces may act as catalysts for protein unfolding.
    • The findings provide insights into the mechanisms of surface-mediated protein denaturation.