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Related Experiment Videos

Structural characterization of pertussis toxin A subunit.

D L Burns1, S Z Hausman, W Lindner

  • 1Center for Drugs and Biologics, Food and Drug Administration, Bethesda, Maryland 20892.

The Journal of Biological Chemistry
|December 25, 1987
PubMed
Summary

The A subunit of pertussis toxin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Toxicology

Background:

  • Pertussis toxin is a bacterial toxin responsible for whooping cough.
  • The A subunit (enzymatically active) and B oligomer (binding) are key components.

Purpose of the Study:

  • To investigate the structure-function relationship of the pertussis toxin A subunit.
  • To identify regions critical for enzymatic activity and oligomerization.

Main Methods:

  • Limited tryptic digestion of the A subunit.
  • Antibody mapping using synthetic peptides.
  • Analysis of NAD glycohydrolase activity.
  • Assessment of reassociation with the B oligomer.

Main Results:

  • Tryptic digestion yielded two fragments (20,000 and 18,000 Mr) containing the NH2-terminal but not the COOH-terminal portion.
  • Both fragments retained NAD glycohydrolase activity.
  • The COOH-terminal portion is not required for enzymatic activity but may be crucial for oligomeric structure.
  • Structural similarities were observed between pertussis toxin A subunit and cholera toxin A subunit.

Conclusions:

  • The COOH-terminal region of the pertussis toxin A subunit is dispensable for NAD glycohydrolase activity.
  • This region likely plays a role in maintaining the overall toxin structure.
  • Antibodies against specific A subunit regions cross-react with cholera toxin A subunit, indicating conserved epitopes.

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