Involved in the suppression of basal resistance and promotion of disease symptoms in plants. Mediates the ubiquitination and degradation, via the host proteasome, of a low-abundance immunity-associated protein in Arabidopsis thaliana. May be involved in the inhibition of a host vesicle trafficking pathway. Interacts with the chaperone ShcM. Interacts with host plant BIG5/ATMIN7. Secreted via the type III secretion system (TTSS). Localized to the plant endomembrane. Transcriptionally induced by HrpL.