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Cloning, expression, and primary structure of a Chlamydia trachomatis binding protein
1Department of Pediatrics, University of Alberta, Edmonton, Canada.
Journal of Bacteriology
|November 1, 1987
Summary
Researchers cloned and sequenced the gene for a Chlamydia trachomatis 18,000-dalton cell-binding protein in E. coli. The recombinant protein retained native binding characteristics and elicited neutralizing antibodies, offering potential for Chlamydia vaccine development.
Area of Science:
- Microbiology
- Molecular Biology
- Immunology
Background:
- Chlamydia trachomatis is an obligate intracellular bacterium that causes significant human diseases.
- Understanding Chlamydia's interaction with host cells is crucial for developing effective treatments and vaccines.
- A key 18,000-dalton protein mediates eukaryotic cell binding, a critical step in Chlamydia infection.
Purpose of the Study:
- To clone and characterize the gene encoding the 18,000-dalton cell-binding protein of Chlamydia trachomatis serovar L2.
- To express and evaluate the functional properties of the recombinant protein in Escherichia coli.
- To assess the immunogenicity and neutralizing capacity of the recombinant protein.
Main Methods:
- Cloning of the Chlamydia trachomatis gene into an Escherichia coli expression vector.
- Determination of the nucleotide sequence of the cloned gene fragment.
- Expression of the recombinant 18,000-dalton protein in E. coli.
- Assessment of eukaryotic cell-binding activity of the recombinant protein.
- Generation and testing of polyclonal antibodies against the recombinant protein.
Main Results:
- A 1,658-base-pair fragment containing the gene for the 18,000-dalton protein was sequenced.
- The gene comprised a 486-base-pair open reading frame encoding a 162-amino acid polypeptide (molecular weight 18,314) with a charged carboxy-terminal end.
- The recombinant protein exhibited identical eukaryotic cell-binding characteristics to the native protein.
- Polyclonal antibodies raised against the recombinant protein demonstrated neutralizing activity.
Conclusions:
- The gene for the Chlamydia trachomatis 18,000-dalton cell-binding protein has been successfully cloned and expressed in E. coli.
- The recombinant protein mimics the cell-binding function of the native protein.
- The recombinant protein is immunogenic and elicits neutralizing antibodies, suggesting its potential as a vaccine candidate against Chlamydia trachomatis infections.