Erwinia amylovora Secretes DspE, a Pathogenicity Factor and Functional AvrE Homolog, through the Hrp (Type III Secretion) Pathway

ABSTRACT

Erwinia amylovora was shown to secrete DspE, a pathogenicity factor of 198 kDa and a functional homolog of AvrE ofPseudomonas syringae pv. tomato. DspE was identified among the supernatant proteins isolated from cultures grown in anhrp gene-inducing minimal medium by immunodetection with a DspE-specific antiserum. Secretion required an intact Hrp pathway.