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Related Experiment Videos

Antibodies as defensive enzymes.

Sudhir Paul1, Yasuhiro Nishiyama, Stephanie Planque

  • 1Chemical Immunology and Therapeutics Research Center, Department of Pathology and Laboratory Medicine, University of Texas-Houston Medical School, MSB 2.250, 6431 Fannin, Houston, TX 77030, USA. Sudhir.Paul@uth.tmc.edu

Springer Seminars in Immunopathology
|January 6, 2005
PubMed
Summary

Proteolytic antibodies, found in healthy humans, can cleave harmful proteins like HIV-1 gp120 and amyloid beta-peptide. These beneficial antibodies may play roles in defending against viruses and neurodegenerative diseases like Alzheimer's.

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Area of Science:

  • Immunology
  • Biochemistry
  • Molecular Biology

Background:

  • Antibodies (Abs) and enzymes share structural and functional similarities.
  • Healthy humans possess antibodies with promiscuous peptidase activity, originating from germline immunoglobulin genes.
  • These antibodies feature a serine protease-like nucleophilic function capable of interacting with antigens.

Purpose of the Study:

  • To explore the dual role of proteolytic antibodies in both pathogenic and beneficial functions.
  • To highlight recent findings on the beneficial roles of antibody-catalyzed reactions.
  • To investigate the potential of proteolytic antibodies in combating viral infections and neurodegenerative diseases.

Main Methods:

  • Analysis of antibody structure and function, focusing on germline variable domain immunoglobulin genes.

Related Experiment Videos

  • Investigation of antibody-antigen interactions, particularly covalent binding to nucleophilic sites.
  • Case studies examining the cleavage of specific proteins (HIV-1 gp120, amyloid beta-peptide) by human antibodies (IgM, IgG).

    • Main Results:

    • Antibodies with peptidase activity are common in healthy individuals.
    • Immunization with electrophilic antigens can induce proteolytic antibodies.
    • Proteolytic antibodies demonstrate beneficial functions, including selective cleavage of HIV-1 gp120 and amyloid beta-peptide.

    Conclusions:

    • Proteolytic antibodies can serve beneficial roles beyond previously recognized pathogenic associations.
    • Antibody-mediated cleavage of HIV-1 gp120 suggests a defense mechanism against viral entry.
    • Cleavage of amyloid beta-peptide by antibodies indicates a potential endogenous response to Alzheimer's disease pathogenesis.