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Human complement C1r and C1s proteins and genes: studies with molecular probes
M Tosi1, A Journet, C Duponchel
1Unité d'Immunogénétique, INSERM U 276, Institut Pasteur, Paris, France.
Behring Institute Mitteilungen
|July 1, 1989
Summary
Complement component 1 (C1) subcomponents C1r and C1s genes possess a unique intronless serine protease domain, unlike other vertebrate proteases. These genes are linked and evolutionarily related to haptoglobin.
Area of Science:
- Molecular Biology
- Immunology
- Genetics
Background:
- Complement component 1 (C1) is crucial for the innate immune system.
- C1 comprises enzymic subcomponents C1r and C1s, whose protein and gene structures were previously incompletely understood.
Purpose of the Study:
- To review recent advances in the molecular study of C1r and C1s proteins and genes.
- To elucidate the evolutionary relationships and genetic organization of C1r and C1s.
Main Methods:
- Isolation of complementary DNA (cDNA) clones for C1r and C1s.
- Derivation of complete amino acid sequences.
- Analysis of gene structure and comparison with protein mosaic structure.
- Use of molecular probes for gene studies.
Main Results:
- Complete amino acid sequences of C1r and C1s were determined, confirming and extending prior protein data.
- The C1r and C1s genes exhibit an unusual intronless serine protease domain, diverging from typical vertebrate serine proteases.
- C1r and C1s are evolutionarily related to haptoglobin, a non-enzymic serine protease analog.
- The C1r and C1s genes are closely linked in a tail-to-tail orientation.
- Successful production of C1r protein via recombinant DNA technology was achieved.
Conclusions:
- The unique genetic features of C1r and C1s provide insights into complement system evolution.
- The findings support the coordinate expression and combined deficiencies observed for C1r and C1s.
- Recombinant C1r production opens avenues for further functional studies.