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. 1994 Mar;32(3):583–588. doi: 10.1128/jcm.32.3.583-588.1994

Characterization of Chlamydia pneumoniae species-specific proteins immunodominant in humans.

Y Iijima 1, N Miyashita 1, T Kishimoto 1, Y Kanamoto 1, R Soejima 1, A Matsumoto 1
PMCID: PMC263090  PMID: 8195362

Abstract

Proteins of Chlamydia pneumoniae immunodominant in humans were characterized with the sera of 13 patients who were not likely to have been exposed to C. trachomatis or C. psittaci. The serological responses among these patients were similar on a qualitative basis, but some differences were found quantitatively. However, the serological responses of the patients who were infected with C. pneumoniae differed markedly from those of two patients who were infected with C. trachomatis and two who were infected with C. psittaci and those of mice that were transtracheally infected with C. pneumoniae. Among proteins immunodominant in the patients who were infected with C. pneumoniae, a 40-kDa major outer membrane protein was genus specific and 53-, 46-, and 43-kDa proteins were species specific in their reactions with the majority of the human sera used. A few sera reacted strongly with a 73-kDa protein genus specifically. Some proteins with weak immunogenicity exhibited species specificity. An antigenic analysis with human sera and murine monoclonal antibodies against the 53-kDa protein showed that hte antigenicities were strictly conserved among the seven strains of C. pneumoniae tested. The genus-specific 73-kDa protein was solubilized with octylglucoside. All of the species-specific immunodominant proteins were solubilized with sodium dodecyl sulfate, but the genus-specific major outer membrane protein was not. These results suggest that a serological diagnosis of C. pneumoniae infection could be achieved species specifically by comparison of the serum responses to sodium dodecyl sulfate- and octylglucoside-soluble fractions.

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Selected References

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