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Mannan-binding protein forms complexes with alpha-2-macroglobulin. A protein model for the interaction

P Storgaard1, E Holm Nielsen, E Skriver

  • 1Department of Medical Microbiology, Odense University, Denmark.

Scandinavian Journal of Immunology
|September 1, 1995
PubMed
Summary

Alpha-2-macroglobulin (alpha 2M) forms complexes with porcine mannan-binding protein (pMBP-28). These complexes were isolated and characterized using various biochemical and microscopic techniques, revealing subunit interactions.

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Preface.

Acta neurologica Scandinavica·2017

Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Alpha-2-macroglobulin (alpha 2M) is a large plasma proteinase inhibitor.
  • Mannan-binding proteins (MBPs) are key components of the innate immune system involved in pathogen recognition.
  • Understanding protein-protein interactions in the immune system is crucial for deciphering host defense mechanisms.

Purpose of the Study:

  • To investigate the potential complex formation between alpha-2-macroglobulin (alpha 2M) and a high molecular weight porcine mannan-binding protein (pMBP-28).
  • To characterize the biochemical and structural properties of these potential complexes.
  • To propose a model for the interaction between pMBP-28 and alpha 2M.

Main Methods:

  • Isolation of alpha 2M/pMBP-28 complexes using PEG-precipitation and affinity chromatography (mannan-Sepharose, protein A-Sepharose, anti-IgM Sepharose).

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  • Detection and characterization using crossed immunoelectrophoresis, SDS-PAGE, Western blotting, electron microscopy, and size exclusion chromatography (Superose 6).
  • Analysis of subunit composition and molecular weight of interacting proteins.

    • Main Results:

    • Complexes of alpha 2M and pMBP-28 were successfully isolated and confirmed through multiple biochemical assays.
    • SDS-PAGE and Western blotting identified alpha 2M subunits (94 and 180 kDa) and pMBP subunits (28 kDa) within the complexes.
    • Electron microscopy visualized the complexes, and size exclusion chromatography revealed distinct molecular weight fractions containing interacting proteins, including a 67 kDa subunit potentially linked to serine protease activity.

    Conclusions:

    • Alpha-2-macroglobulin (alpha 2M) interacts with porcine mannan-binding protein (pMBP-28) to form stable complexes.
    • The characterization of these complexes provides insights into the molecular mechanisms of innate immunity.
    • A model for the interaction between pMBP-28 and alpha 2M is proposed based on the observed biochemical and structural data.