Abstract: Pseudomonas savastanoi pv. savastanoi is the causal agent of Olive knot disease, relying on the Type Three Secretion System (TTSS) for its pathogenicity. In this regard, nothing was known about the two other pathovars belonging to this species, pv. nerii and pv. fraxini, characterized by a different host range. Here we report on the organization of the entire TTSS cluster on the three pathovars, and a phylogenetic analysis including the TTSS of those bacteria belonging to the P. syringae complex sequenced so far, highlighting the evolution of each operon (hrpC, hrpJ, hrpRS, hrpU and hrpZ). Moreover, by Real-Time PCR we analyzed the in vitro expression of four main TTSS genes, revealing different activation patterns in the three pathovars, hypothetically related to their diverse virulence behaviors.
Keywords: Type Three Secretion System; hrp; Pseudomonas syringae; Pseudomonas savastanoi; evolution; recombination; gene expression; regulation
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Tegli, S.; Gori, A.; Cerboneschi, M.; Cipriani, M.G.; Sisto, A. Type Three Secretion System in Pseudomonas savastanoi Pathovars: Does Timing Matter? Genes 2011, 2, 957-979.
Tegli S, Gori A, Cerboneschi M, Cipriani MG, Sisto A. Type Three Secretion System in Pseudomonas savastanoi Pathovars: Does Timing Matter? Genes. 2011; 2(4):957-979.
Tegli, Stefania; Gori, Andrea; Cerboneschi, Matteo; Cipriani, Maria Grazia; Sisto, Angelo. 2011. "Type Three Secretion System in Pseudomonas savastanoi Pathovars: Does Timing Matter?" Genes 2, no. 4: 957-979.