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Ovocalyxin-36 is a pattern recognition protein in chicken eggshell membranes
Cristianne M M Cordeiro1, Hamed Esmaili1, George Ansah2
1Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.
Plos One
|January 7, 2014
Summary
Ovocalyxin-36 (OCX-36), an eggshell membrane protein, binds bacterial components like lipopolysaccharide (LPS) and inhibits Staphylococcus aureus growth. Genetic variations in OCX-36 affect its binding activity, suggesting a role in innate immunity for avian eggs.
Area of Science:
- Biochemistry
- Immunology
- Avian Biology
Background:
- Avian eggshell membranes provide defense against bacterial penetration.
- Ovocalyxin-36 (OCX-36) is a major protein in eggshell membranes, homologous to bactericidal permeability-increasing protein (BPI), lipopolysaccharide-binding protein (LBP), and palate, lung and nasal epithelium clone (PLUNC) proteins.
Purpose of the Study:
- To efficiently extract and purify OCX-36 from chicken eggshell membranes.
- To investigate the antibacterial properties and lipopolysaccharide (LPS) binding activity of OCX-36.
- To explore the impact of OCX-36 genetic variations on its function.
Main Methods:
- Extraction and purification of OCX-36 using cation and anion exchange chromatographies.
- Assessing LPS binding activity of purified OCX-36 with Escherichia coli O111:B4 LPS.
- Evaluating the inhibitory effect of OCX-36 on Staphylococcus aureus growth.
- Genotyping hens and purifying OCX-36 variants (Pro-71 and Ser-71) for comparative analysis of lipoteichoic acid (LTA) binding.
Main Results:
- Purified OCX-36 demonstrated dose-dependent LPS binding activity.
- OCX-36 exhibited inhibitory effects against Staphylococcus aureus growth.
- Significant differences in lipoteichoic acid (LTA) binding activity were observed between Pro-71 and Ser-71 OCX-36 variants.
Conclusions:
- OCX-36 possesses antibacterial properties and binds bacterial components, suggesting a role in innate immunity.
- Genetic variations in OCX-36 influence its interaction with bacterial molecules, impacting its immune function.
- This research provides a foundation for understanding OCX-36's role in protecting avian eggs from bacterial invasion, relevant to both reproductive success and food safety.
