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Polypeptide composition of Chlamydia trachomatis

S H Salari, M E Ward

    Journal of General Microbiology
    |April 1, 1981
    PubMed
    Summary
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    This study enhanced Chlamydia trachomatis yields using DEAE-dextran treatment in HeLa cells. Researchers identified key chlamydial polypeptides, including surface proteins, correlating with serotypes and human infections.

    Area of Science:

    • Microbiology and Immunology
    • Cell Biology
    • Protein Biochemistry

    Background:

    • Chlamydia trachomatis is a significant human pathogen with diverse serotypes causing various infections.
    • Understanding chlamydial protein composition is crucial for developing diagnostics and therapeutics.
    • Previous methods for studying chlamydial proteins were limited in scope and efficiency.

    Purpose of the Study:

    • To optimize the culture of Chlamydia trachomatis serotypes in HeLa cells.
    • To identify and characterize major chlamydial polypeptides, including surface proteins.
    • To correlate polypeptide profiles with specific C. trachomatis serotypes and associated human diseases.

    Main Methods:

    • HeLa 229 cells were treated with DEAE-dextran to enhance susceptibility to C. trachomatis infection.

    Related Experiment Videos

  • Radiolabelling of chlamydial polypeptides with 3H-amino acids in the presence of emetine.
  • Purification of radiolabelled chlamydiae via density gradient centrifugation and analysis by SDS-PAGE.
  • Surface polypeptide labelling using 125I and lactoperoxidase-catalyzed oxidation.

    • Main Results:

    • DEAE-dextran treatment optimized C. trachomatis yields across 14 serotypes.
    • Polypeptide analysis revealed a 118,000-dalton protein unique to lymphogranuloma venereum (LGV) strains.
    • Major chlamydial polypeptide (38,000-42,000 daltons) distribution correlated with human infection patterns.
    • Surface proteins identified as the major polypeptide, 155,000-dalton, and 29,000-dalton polypeptides.

    Conclusions:

    • The 155,000-dalton polypeptide is likely a species-specific antigen.
    • The major polypeptide (38-42 kDa) is identified as the principal outer membrane protein.
    • The 29,000-dalton polypeptide is suggested to be the type-specific antigen, crucial for serotyping.