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Rapid Glyco-Qualitative Assessment of Recombinant Proteins Using a Fully Automated System
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Quantification of mannan-binding lectin.

Pernille D Frederiksen1, Steffen Thiel, Lisbeth Jensen

  • 1Department of Medical Microbiology and Immunology, University of Aarhus, Wilhelm Meyers Allé, 8000 Aarhus, DK, Denmark. pdf@microbiology.au.dk

Journal of Immunological Methods
|September 19, 2006
PubMed
Summary

Mannan-binding lectin (MBL) quantification varies by assay, with some detecting mutant forms. A new Western blot method accurately measures MBL polypeptide chains, correlating with a specific MBL assay in deficient individuals.

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Area of Science:

  • Immunology
  • Biochemistry

Background:

  • Mannan-binding lectin (MBL) plays a crucial role in immune defense.
  • Congenital MBL deficiency is common, necessitating accurate clinical relevance evaluation.
  • MBL deficiency arises from coding region allotypes (B, C, D) and promoter mutations.

Purpose of the Study:

  • To compare MBL quantification across commercial and in-house assays.
  • To investigate the detection of mutant MBL forms by different assays.
  • To develop and validate a novel method for quantifying MBL polypeptide chains.

Main Methods:

  • Comparison of four commercial MBL assays with in-house assays.
  • Development of a sandwich-type time-resolved immunoflourometric assay (TRIFMA) using a monoclonal antibody (93C).
  • Quantification of MBL polypeptide chains via SDS-PAGE, Western blotting, and chemiluminescence.

Main Results:

  • Most commercial assays are sensitive only to wild-type MBL (allotype A).
  • The 93C-based TRIFMA detected mutant MBL forms in B/B and D/D homozygotes (up to 500 ng/ml).
  • The novel Western blot method quantified MBL polypeptide chains (100-500 ng/ml) in O/O homozygotes, correlating with 93C-TRIFMA results.

Conclusions:

  • Assay selection is critical for accurate MBL quantification, especially in deficiency states.
  • The 93C-based TRIFMA and Western blot method offer improved detection of MBL variants.
  • Accurate MBL quantification is essential for understanding its clinical relevance in immune defense.