The OmpA protein is one of the main outer-membrane proteins of a large array of Gram-negative bacteria such as A. salmonicida， Shigella dysenteriae and E. coli. OmpA’s major physiological functions include maintenance of the structural integrity and morphology of the cells and porin activity， as well as a role in conjugation and bacteriophage binding. Achromogenic atypical Aeromonas salmonicida is the causative agent of goldfish ulcer disease. Virulence of this bacterium is associated with the production of a paracrystalline outer membrane A-layer protein. The species specific structural gene for the monomeric form of A-protein was cloned into a pET-3d plasmid in order to express and produce a recombinant form of the protein in E. coli BL21（DE3）. The induced protein was isolated from inclusion bodies by a simple solubilization-renaturation procedure and purified by ion exchange chromatography on Q-Sepharose to over 95% pure monomeric protein. Recombinant A-protein was compared by biochemical， immunological and molecular methods with the A-protein isolated from atypical A. salmonicida bacterial cells by the glycine and the membrane extraction methods.
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大肠杆菌中重组表达
溶解建议
Sterile Filtered White lyophilized （freeze-dried） powder. It is recommended to reconstitute the lyophilized OmpA in sterile 0.4% NaHCO3.
保存建议
Lyophilized Bacterial Outer Membrane Protein-A although stable at room temperature for 3 weeks， should be stored desiccated below -18℃. Upon C between 2-7 days and for future usereconstitution OmpA should be stored at 4 below -18℃. For long term storage it is recommended to add a carrier protein （0.1% HSA or BSA）.
Please avoid freeze-thaw cycles.
