Regulation of hrp Genes and Type III Protein Secretion in Erwinia amylovora by HrpX/HrpY, a Novel Two-Component System, and HrpS

Abstract
Two novel regulatory components, hrpX and hrpY, of the hrp system of Erwinia amylovora were identified. The hrpXY operon is expressed in rich media, but its transcription is increased threefold by ...