HrpL negatively regulates flagellar system in Erwinia amylovora
2004
Cesbron, Sophie | Brisset, Marie-Noelle | Tharaud, Michel | Paulin, J Pierre | Unité de recherche Pathologie végétale et phytobactériologie ; Institut National de la Recherche Agronomique (INRA)
International audience
Afficher plus [+] Moins [-]anglais. Several previous works seem to indicate that flagellar and hrp genes of Erwinia amylovora are counter-regulated. In the present paper, this hypothesis is confirmed by the analysis of several parameters linked to flagella synthesis in E. amylovora grown in hrp- or non hrp-inducing conditions. Moreover, amongst the various hrp mutants tested, the hrpL regulatory mutant only was more motile, produced more flagellins and showed more flagella than the wild-type strain when cultivated on a hrp-inducing medium. A plasmid carrying hrpL introduced into a hrpL mutant decreased its motility and flagellin production. These results strongly suggest that flagellar synthesis of E. amylovora is under the negative control of HrpL, a positive regulator of hrp genes.
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