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Immunoelectron microscopic localisation of the OMP90 family on the outer membrane surface of Chlamydia psittaci
D Longbottom1, J Findlay, E Vretou
1Moredun Research Institute, International Research Centre, Penicuik, Midlothian, UK. longd@mri.sari.ac.uk
Abstract:
The putative outer membrane location of the OMP90 (formerly POMP) family from the ovine abortion strain of Chlamydia psittaci was investigated by immunoelectron microscopy. Using a non-embedding technique, antigens were shown to be localised on the outer membrane surface of both elementary and reticulate bodies, the infectious and non-infectious forms of Chlamydiae respectively. Antibodies affinity-purified against the expressed amino- and carboxy-terminal halves of one of the family members. OMP90A, demonstrated that the amino half is surface-exposed while the carboxyl half is most probably localised internally. Surface localisation on elementary bodies indicates the importance of these proteins as protective antigen candidates.
Insights
The OMP90 protein family in Chlamydia psittaci is located on the outer membrane surface. This finding highlights their potential as protective antigens for vaccines.
Area of Science:
- Microbiology
- Immunology
- Cell Biology
Background:
- The OMP90 (formerly POMP) protein family's location within Chlamydia psittaci was previously uncertain.
- Chlamydia psittaci is an important veterinary pathogen causing ovine abortion.
- Understanding the localization of outer membrane proteins is crucial for vaccine development.
Purpose of the Study:
- To investigate the outer membrane localization of the OMP90 protein family in Chlamydia psittaci.
- To determine the surface exposure of different domains of OMP90A.
- To assess the potential of OMP90 proteins as protective antigens.
Main Methods:
- Immunoelectron microscopy was employed to visualize antigen localization.
- A non-embedding technique was utilized for high-resolution imaging.
- Antibodies against specific domains of OMP90A were used for affinity purification and localization studies.
Main Results:
- OMP90 family antigens were localized to the outer membrane surface of both elementary and reticulate bodies.
- The amino-terminal half of OMP90A is surface-exposed.
- The carboxyl-terminal half of OMP90A is likely located internally.
Conclusions:
- The OMP90 protein family resides on the outer membrane surface of Chlamydia psittaci.
- The surface localization of OMP90 proteins on elementary bodies suggests their role as key protective antigen candidates.
- Further research into OMP90 proteins could lead to novel strategies for controlling Chlamydia psittaci infections.