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Single channel analysis of recombinant major outer membrane protein porins from Chlamydia psittaci and Chlamydia
S Wyllie1, D Longbottom, A J Herring
1Moredun Research Institute, International Research Centre, Pentlands Science Park, Penicuik, Midlothian, UK.
Abstract:
We recently demonstrated that the major outer membrane protein of Chlamydia psittaci, the primary vaccine candidate for combating chlamydial infections, functions as a porin-like ion channel. In this study, we have cloned, expressed and functionally reconstituted recombinant major outer membrane proteins from C. psittaci and Chlamydia pneumoniae and analysed them at the single channel level. Both form porin-like ion channels that are functionally similar to those formed by native C. psittaci major outer membrane protein. Also, like the native channels, recombinant C. psittaci channels are modified by a native major outer membrane protein-specific monoclonal antibody. This is the first time that native function has been demonstrated for recombinant chlamydial major outer membrane proteins. Future bilayer reconstitution will provide a strategy for detailed structure/function studies of this new subclass of bacterial porins and the work also has important implications for successful protein refolding and the development of improved subunit vaccines.
Insights
Recombinant major outer membrane proteins from Chlamydia species function as porin-like ion channels. This study demonstrates native function for these recombinant proteins, paving the way for improved chlamydial vaccines.
Area of Science:
- Microbiology
- Structural Biology
- Vaccinology
Background:
- The major outer membrane protein of Chlamydia psittaci is a key vaccine candidate.
- This protein was previously shown to function as a porin-like ion channel.
Purpose of the Study:
- To clone, express, and functionally reconstitute recombinant major outer membrane proteins from Chlamydia psittaci and Chlamydia pneumoniae.
- To analyze the function of these recombinant proteins at the single-channel level.
- To demonstrate native function for recombinant chlamydial outer membrane proteins.
Main Methods:
- Gene cloning and protein expression.
- Functional reconstitution into lipid bilayers.
- Single-channel electrophysiology recordings.
- Monoclonal antibody modification analysis.
Main Results:
- Both recombinant C. psittaci and C. pneumoniae major outer membrane proteins form functional porin-like ion channels.
- The channels formed by recombinant proteins are functionally similar to native channels.
- Recombinant C. psittaci channels are recognized by a specific monoclonal antibody, similar to native channels.
Conclusions:
- This is the first demonstration of native function for recombinant chlamydial major outer membrane proteins.
- Future studies will utilize bilayer reconstitution for detailed structure-function analysis of this bacterial porin subclass.
- Findings have implications for protein refolding and the development of improved subunit vaccines against chlamydial infections.
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