Virulence factors are released in association with outer membrane vesicles of Pseudomonas syringae pv. tomato T1 during normal growth.

Outer membrane vesicles (OMVs) are released from Pseudomonas syringae pv. tomato T1 (Pst T1) during their normal growth. These extracellular compartments are comprised of a complete set of biological macromolecules that includes proteins, lipids, lipopolysaccharides, etc. It is evident from proteomics analyses the OMVs of Pst T1 contain membrane- and virulence-associated proteins. In addition, OMVs of this organism are also associated with phytotoxin, coronatine. Therefore, OMVs of Pst T1 must play a significant role during pathogenicity to host plant. However, further studies are required whether these structures can serve as "vehicles" for the transport of virulence factors into the host membrane.