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Characterization of rainbow trout C-polysaccharide binding proteins
1Department of Epizootiology, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
The Journal of Veterinary Medical Science
|June 1, 1995
Summary
Researchers identified a novel protein in rainbow trout serum, distinct from C-reactive protein (CRP). This newly discovered protein exhibits unique structural characteristics and sequence similarities to CRPs in other species.
Area of Science:
- Immunology
- Biochemistry
- Aquatic Animal Health
Background:
- C-reactive protein (CRP) is a key acute-phase protein involved in innate immunity.
- Previous research identified CRP in rainbow trout (Murai et al. 1990).
Purpose of the Study:
- To isolate and characterize novel proteins from rainbow trout serum.
- To investigate proteins potentially related to C-reactive protein (CRP) function.
Main Methods:
- Affinity chromatography utilizing C-polysaccharide-Sepharose 4B.
- Native gradient polyacrylamide gel electrophoresis (NG-PAGE) for molecular weight determination.
- Isoelectric focusing (IEF) for isoelectric point analysis.
- N-terminal amino acid sequencing.
- Electron microscopy for structural analysis.
Main Results:
- Two proteins were successfully isolated from rainbow trout serum.
- One isolated protein was identified as rainbow trout C-reactive protein (CRP).
- A novel protein was characterized with a molecular weight of 135,000 Da and isoelectric points of 5.2-5.8.
- The novel protein's N-terminal sequence showed 44% homology to plaice CRP.
- Electron microscopy revealed a pentagonal symmetry structure for the novel protein.
Conclusions:
- A novel serum protein, distinct from rainbow trout CRP, has been identified and characterized.
- The structural and sequence similarities suggest a potential functional relationship to CRPs in other species.
- This discovery expands the understanding of immune-related proteins in fish.