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A novel murine complement-related gene encoding a C1r-like serum protein
Antonella Circolo1, Gérard Garnier, John E Volanakis
1Department of Medicine, Division of Clinical Immunology and Rheumatology, University of Alabama, Birmingham, AL 35294, USA.
Molecular Immunology
|April 11, 2003
Summary
Researchers discovered a novel C1r-like protein (c1r-LP) in mice, likely arising from gene duplication. This protein, found in serum and expressed in the liver, may regulate the classical complement pathway.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- C1r and C1s initiate the classical complement pathway.
- Murine C1r genes are duplicated, suggesting evolutionary novelty.
Purpose of the Study:
- To investigate a novel C1r-like protein (c1r-LP) identified in mice.
- To understand the structure, expression, and potential function of c1r-LP.
Main Methods:
- Gene duplication analysis
- 5'-flanking region analysis of murine C1rA gene
- cDNA cloning and sequencing
- Western blot analysis
Main Results:
- A novel c1r-LP gene was identified, similar in structure to C1rA but with a large deletion.
- c1r-LP is primarily expressed in the liver and detected in mouse serum.
- c1r-LP shows significant amino acid identity to C1rA, particularly in the serine protease domain, but lacks a key activation site.
Conclusions:
- c1r-LP likely originated from C1r gene duplication.
- The atypical active center suggests c1r-LP may be a non-proteolytic enzyme or a regulator of the classical complement pathway.