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Observations on the conformational changes in the structure of a cell surface protease, followed by its ability to be

F S Steven1, M M Griffin, M Anees

  • 1Department of Biochemistry and Molecular Biology, School of Biological Sciences, University of Manchester, UK.

Journal of Enzyme Inhibition
|January 1, 1992
PubMed

Insights

Lung tumor cells have a surface protease inhibited by an intracellular protein. Sodium dodecyl sulfate treatment dissociates this enzyme-inhibitor complex, restoring protease activity, which was tracked using a fluorescent probe.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Lung tumor cells exhibit a cell surface protease.
  • This protease activity is regulated by a cytoplasmic inhibitor protein.
  • Understanding enzyme-inhibitor dynamics is crucial for cancer research.

Purpose of the Study:

  • To investigate the dissociation of the enzyme-inhibitor complex on lung tumor cell surfaces.
  • To determine the effect of sodium dodecyl sulfate on this complex.
  • To monitor the regain of protease activity after complex dissociation.

Main Methods:

  • Studied enzyme-inhibitor complex dissociation in lung tumor cell sections.
  • Utilized 10(-4) M sodium dodecyl sulfate for treatment.
  • Employed a competitive fluorescent probe to track active enzyme sites.

Main Results:

  • Sodium dodecyl sulfate effectively dissociates the enzyme-inhibitor complex.
  • Dissociation leads to the regain of cell surface protease activity.
  • Fluorescent probe confirmed enzyme activity restoration.

Conclusions:

  • The cell surface protease of lung tumor cells can be reactivated.
  • Sodium dodecyl sulfate treatment is a viable method for dissociating the inhibitor.
  • This study provides insights into the regulation of tumor cell proteases.

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