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Erwinia Amylovora Secretes DspE, A Pathogenicity Factor And Functional AvrE Homolog, Through The Hrp (Type III Secretion) Pathway

Adam J. Bogdanove, David W. Bauer, Steven V. Beer

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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.