Clinical and Diagnostic Laboratory Immunology, May 1998, p. 313-318, Vol. 5, No. 3
1071-412X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Department of Medical Microbiology and Immunology, University of Aarhus, DK-8000 Aarhus, Denmark,1 and Department of Virology, The University Hospital, Malmö, Sweden2
Received 20 October 1997/Returned for modification 7 January 1998/Accepted 16 February 1998
The humoral immune response to Chlamydia outer membrane
protein 2 (Omp2) was studied. Omp2 is a highly genus-conserved
structural protein of all Chlamydia species, containing a
variable N-terminal fragment. To analyze where the immunogenic parts
were localized, seven highly purified truncated fusion proteins
constituting different regions of the protein were produced
(Chlamydia pneumoniae-Omp2aa23-aa93, Chlamydia psittaci-Omp2aa23-aa94, and
Chlamydia trachomatis-Omp2aa23-aa84, aa87-aa547,
aa23-aa182, aa167-aa434, aa420-aa547). By an enzyme-linked
immunosorbent assay with serologically defined patient sera, Omp2 was
found to be a major immunogen of both C. pneumoniae and
C. trachomatis infections (P
0.0001). The
humoral immune responses were not confined to any particular region of the Omp2 protein, and no species-specific anti-Omp2 immunoglobulins were detected.
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