Expression and characterization of recombinant chicken mannose binding lectin

Area of Science:

• Immunology
• Biochemistry
• Avian Biology

Background:

• Mannose-binding lectin (MBL) is crucial for innate immunity in mammals, binding pathogens and initiating defense mechanisms.
• The specific role of MBL in chickens remains unclear, despite observed correlations between MBL levels and infection resistance.

Purpose of the Study:

• To produce and characterize recombinant chicken MBL (RcMBL) for further investigation of its function in avian innate immunity.
• To assess the structural and functional similarity of RcMBL to native chicken MBL (NcMBL).

Main Methods:

• Recombinant chicken MBL (RcMBL) was produced in HeLa R19 cells.
• Purification involved mannan affinity chromatography and gel filtration.
• Structural and functional characterization included mass spectrometry, glycan array analysis, and biological activity assays.

Main Results:

• RcMBL was structurally and functionally comparable to native chicken MBL (NcMBL).
• RcMBL exists as oligomers with a monomeric mass of 26kDa and binds strongly to high-mannose glycans.
• RcMBL demonstrated biological activity by agglutinating Salmonella Typhimurium and inhibiting influenza A virus hemagglutination.

Conclusions:

• The production of well-characterized, active RcMBL is a significant advancement.
• RcMBL will facilitate detailed studies on the role of MBL in chicken innate defense against pathogens.
• This research supports understanding MBL function in other avian species.