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Related Experiment Videos

A catalytic antibody uses a multistep kinetic sequence.

S J Benkovic1, J Adams, K D Janda

  • 1Pennsylvania State University, Department of Chemistry, University Park 16802.

Ciba Foundation Symposium
|January 1, 1991
PubMed
Summary

Antibody NPN43C9 catalyzes ester and anilide hydrolysis. Its reaction mechanism, involving an acyl intermediate, is pH-dependent and resembles serine protease pathways.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Catalysis

Background:

  • Antibodies can function as catalysts, mimicking enzyme activity.
  • Understanding antibody catalysis provides insights into enzyme mechanisms.

Purpose of the Study:

  • To investigate the catalytic mechanism of antibody NPN43C9.
  • To elucidate the pH-dependent kinetics of ester and anilide hydrolysis.

Main Methods:

  • Kinetic analysis of p-nitrophenyl ester and p-nitroanilide hydrolysis.
  • pH-dependent reaction rate measurements.

Main Results:

  • Antibody NPN43C9 catalyzes hydrolysis of ester and anilide substrates.
  • The ester hydrolysis involves at least two steps, with pH-dependent relative importance.
  • A pH-dependent shift in the rate-limiting step was observed, from product release to hydroxide ion attack.

Conclusions:

  • The catalytic mechanism of NPN43C9 involves an acyl intermediate.
  • The reaction pathway shares similarities with serine proteases.
  • Antibody catalysis offers a model for understanding enzymatic reactions.

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