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Oligomerization of Mannan-binding Lectin Dictates Binding Properties and Complement Activation.

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The oligomeric state of mannan-binding lectin (MBL) is critical for its function. Tetrameric MBL binds better to bacteria and activates the complement system more effectively than trimeric MBL.

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The complement system, part of innate immunity, recognizes and clears pathogens.
  • The lectin pathway initiates complement activation via pattern recognition molecules (PRMs) binding to foreign surfaces.
  • Mannan-binding lectin (MBL) is a key PRM, existing as various oligomers.

Purpose of the Study:

  • To investigate how MBL oligomerization affects its binding to microorganisms.
  • To determine the influence of MBL oligomers on interactions with MBL-associated serine proteases (MASPs) and MBL-associated proteins (MAps).
  • To assess the impact of MBL oligomeric state on complement activation.

Main Methods:

  • Binding assays of different MBL oligomers to Staphylococcus aureus at 37°C.
  • Analysis of MBL oligomeric forms in serum complexes with MASPs and MAp44.
  • Interaction studies using purified recombinant MBL (rMBL) oligomers with MASPs and MAp44.
  • Complement activation assays comparing trimeric and tetrameric rMBL.

Main Results:

  • Tetrameric MBL exhibited higher binding to S. aureus compared to trimeric and dimeric forms.
  • Tetrameric MBL was the predominant oligomer found in serum complexes with MASPs and MAp44.
  • Tetrameric rMBL showed stronger interactions with MASPs and MAp44 than trimeric rMBL.
  • Trimeric rMBL was less effective than tetrameric rMBL in activating the complement system.

Conclusions:

  • MBL oligomerization significantly influences its binding capabilities to microbial surfaces.
  • The oligomeric state of MBL is crucial for its interaction with MASPs and MAp44.
  • Tetrameric MBL demonstrates superior effector function in initiating complement activation compared to trimeric MBL.