Abstract:
:Abstract In prokaryotes, a diverse set of physiological processes is regulated by transcription factors which belong to the well-conserved, enhancer-binding protein (EBP) family. These regulatory proteins function together with the alternate sigma factor (sigma(54)). Structurally, the EBPs are characterized by a central activator domain, containing the recognition motif for the RNA polymerase/sigma(54) complex (Esigma(54)), and the C-terminal domain, containing a DNA-binding helix-turn-helix motif. A regulatory system of the EBP type also exists in Pseudomonas syringae, where it controls the expression of genes required for the induction of disease symptoms and resistance responses in plants. The system consists of the two genes, hrpR and hrpS, which belong to the hrp (hypersensitive response and pathogenicity) gene cluster. The two genes show a high degree of structural and sequence similarities, but function at different positions in the hrp regulatory cascade of the bean pathogen Pseudomonas syringae pv. phaseolicola. In this paper, we were interested in the basis of the difference in specificity between hrpR and hrpS. The functional specificities of the two domains of hrpS and hrpR were analysed by domain switching. Complementation analyses with the hybrid genes and retardation experiments with the protein products showed significant differences between the respective domains of hrpS and hrpR.
journal_name
Mol Plant Patholjournal_title
Molecular plant pathologyauthors
Schuster M,Grimm Cdoi
10.1046/j.1364-3703.2000.00028.xsubject
Has Abstractpub_date
2000-07-01 00:00:00pages
233-41issue
4eissn
1464-6722issn
1364-3703pii
MPP028journal_volume
1pub_type
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更新日期:2016-09-01 00:00:00
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