11/19/2022 0 Comments Xf and indection in plant![]() Their structure suggests extensive evolutionary restructuring through horizontal gene transfers and heterologous recombination mechanisms. These results demonstrate that these genes are expressed in planta during pathogenesis. Surprisingly, some of these small peptides are most similar not to their corresponding full length RTX, but to the N-termini of RTXs from other Xf strains, and even other remotely related species. Further, the four genes are found in operons having a peculiar structure with an extensively duplicated module encoding a small protein with homology to the N-terminal region of the full length RTX. Thus these RTX orthologues are most easily visualized as fusions between the orthologous C–termini and different N-termini. More striking is that many of the orthologous loci between strains share this extreme variation at the N-termini. However, within strains there is no N-terminal homology, indicating these loci encode RTXs of different functions and/or specificities. At the C-termini, sequence diversity between strains is what would be expected from orthologous genes. The sequences from these four genes have a complex repetitive structure. We show that all four genes are expressed during pathogenesis in grapevine. Xf has four loci encoding homologues to hemolysin RTX proteins, virulence factors involved in a wide range of plant pathogen interactions. coffee, citrus, grapevine) Xf is pathogenic. In most species this bacterium lives as a benign symbiote, but in several agriculturally important plants (e.g. ![]() ![]() Xylella fastidiosa ( Xf) is a gram negative bacterium inhabiting the plant vascular system. ![]()
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