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Related Experiment Videos

Complement-related serine proteases in tunicates and vertebrates

M Matsushita1, Y Endo, M Nonaka

  • 1Department of Biochemistry, Fukushima Medical College, Japan. mmatsu@cc.fmu.ac.jp

Current Opinion in Immunology
|April 2, 1998
PubMed
Summary

Serum mannose-binding lectin, associated with mannose-binding lectin-associated serine protease (MASP), is vital for innate immunity. This protein complex activates complement, similar to the classical pathway, and MASP may be an ancient evolutionary precursor.

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Area of Science:

  • Immunology
  • Biochemistry
  • Evolutionary Biology

Background:

  • Serum mannose-binding lectin (MBL) is a key component of the innate immune system.
  • MBL interacts with pathogens via associated serine proteases, notably MASP.
  • This interaction initiates complement activation, mimicking the classical pathway.

Purpose of the Study:

  • To elucidate the role of MASP in MBL-mediated innate immunity.
  • To investigate the evolutionary origins of MASP within the serine protease family.

Main Methods:

  • Biochemical analysis of MBL-MASP complex function.
  • Comparative analysis of MASP across different species, including primitive life forms.

Main Results:

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  • The MBL-MASP complex effectively activates the complement system.
  • MASP shares structural and functional similarities with classical pathway proteases C1r and C1s.
  • MASP is conserved in primitive organisms like tunicates, suggesting ancient origins.

    • Conclusions:

    • MASP is crucial for MBL-driven complement activation in innate immunity.
    • MASP represents an evolutionary prototype for serine proteases involved in complement activation.
    • The findings highlight the ancient evolutionary roots of key immune system components.