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• W2000990948 abstract "A regulatory cascade activating hrp/hrc type III secretion and effector genes was delineated in Pantoea stewartii subsp. stewartii, a bacterial pathogen of corn. Four hrp regulatory genes were characterized: hrpX and hrpY encode the sensor kinase and response regulator, respectively, of a two-component signal transduction system; hrpS encodes an NtrC-like transcriptional enhancer; and hrpL encodes an alternative sigma factor. Epistasis analysis, expression studies using gene fusions, and genetic reconstruction of each step in Escherichia coli were used to delineate the following pathway: HrpY activates hrpS and also positively auto-regulates the hrpXY operon. In turn, HrpS is required for full activation of the σ 54 -dependent hrpL promoter. Finally, HrpL controls expression of all known hrp and wts genes. In vitro, hrpS and all downstream hrp genes were regulated by pH and salt concentration. Mutants with in-frame deletions in hrpX were still partially virulent on corn but were unable to sense the chemical or metabolic signals that induce hrp genes in vitro. Site-directed mutagenesis of HrpY indicated that aspartate 57 is the probable phosphorylation site and that it is needed for activity. These findings suggest that both HrpX and an alternate mechanism are involved in the activation of HrpY in planta." @default.
• W2000990948 created "2016-06-24" @default.
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• W2000990948 date "2003-03-01" @default.
• W2000990948 modified "2023-09-25" @default.
• W2000990948 title "The HrpX/HrpY Two-Component System Activates <i>hrpS</i> Expression, the First Step in the Regulatory Cascade Controlling the Hrp Regulon in <i>Pantoea stewartii</i> subsp. <i>stewartii</i>" @default.
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• W2000990948 doi "https://doi.org/10.1094/mpmi.2003.16.3.238" @default.
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