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Related Experiment Videos

The immunological evolution of catalysis

P A Patten1, N S Gray, P L Yang

  • 1Howard Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, CA 94720, USA.

Science (New York, N.Y.)
|February 23, 1996
PubMed
Summary
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Researchers cloned genes for mouse esterolytic antibody 48G7 to study immune system evolution of catalytic function. Affinity maturation significantly enhanced antibody binding and catalytic rates through somatic mutations, revealing conformational changes in the active site.

Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • The immune system evolves catalytic antibodies through somatic hypermutation and affinity maturation.
  • Understanding the molecular mechanisms of antibody catalysis is crucial for developing novel biocatalysts.

Purpose of the Study:

  • To investigate the molecular basis of catalytic function evolution in the esterolytic antibody 48G7.
  • To elucidate the role of somatic mutations in enhancing antibody affinity and catalytic efficiency.

Main Methods:

  • Cloning and expression of germline genes for antibody 48G7.
  • Determination of the three-dimensional crystal structure of the antibody-transition state analogue complex.
  • Analysis of somatic and directed active site mutants.

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Main Results:

  • Nine somatic mutations increased antibody affinity for the transition state analogue by 10(4)-fold.
  • Catalytic efficiency (k(cat)/k(m)) increased from 1.7 x 10(2)M(-1) min(-1) to 1.4 x 10(4)M(-1) min(-1).
  • Crystal structure revealed direct contact of a mutated residue with the hapten, suggesting a conformational role in catalysis.

Conclusions:

  • Affinity maturation plays a conformational role in antibody catalysis by reorganizing active site geometry.
  • Transition state stabilization is a key mechanism in the evolution of catalytic antibodies.
  • The study provides insights into the molecular evolution of enzyme-like functions in antibodies.