Query: NC_002488:1638946 Xylella fastidiosa 9a5c, complete genome
Lineage: Xylella fastidiosa; Xylella; Xanthomonadaceae; Xanthomonadales; Proteobacteria; Bacteria
General Information: This strain was derived from a pathogenic strain (8.1b) isolated in 1992 in France that had come from infected twigs derived from the sweet orange strain Valencia in Brazil in the same year. This organism was first identified in 1993 as the causal agent of citrus variegated chlorosis, a disease that affects varieties of sweet oranges. Other strains of this species cause a range of diseases in mulberry, pear, almond, elm, sycamore, oak, maple, pecan and coffee which collectively result in multimillion dollar devastation of economically important plants. Xylella fastidiosa is similar to Xanthomonas campestris pv. campestris in that it produces a wide variety of pathogenic factors for colonization in a host-specific manner including a large number of fimbrial and afimbrial adhesins for attachment. It does not contain a type III secretion system, but possesses genes for a type II secretion system for export of exoenzymes that degrade the plant cell wall and allow the bacterium to colonize the plant xylem.
Subject: NC_007951:3631772 Burkholderia xenovorans LB400 chromosome 1, complete sequence
Lineage: Burkholderia xenovorans; Burkholderia; Burkholderiaceae; Burkholderiales; Proteobacteria; Bacteria
General Information: Originally identified as Pseudomonas sp. LB400 that was found in contaminated soil in upstate New York, USA, this organism is now classified in the genus Burkholderia. Polychlorinated biphenyl-degrading bacterium. Member of the genus Burkholderia are versatile organisms that occupy a surprisingly wide range of ecological niches. These bacteria are exploited for biocontrol, bioremediation, and plant growth promotion purposes. Burkholderia xenovorans has been found on fungi, animals, and from human clinical isolates such as from cystic fibrosis (CF) patients. It may be tightly associated with white-rot fungus, as the degadation of lignin by the fungus results in aromatic compounds the bacterium can then degrade. This organism is exceptionally capable of degradation of polychlorinated biphenyls (PCBs), which are environmental pollutants, and thus it may play a role in bioremediation of polluted and toxic sites and is studied as a model bioremediator. PCBs can be utilized as the sole carbon and energy source by this organism. The pathways for degradation of PCBs have been extensively characterized at both the genetic and the molecular level and have become a model system for the bacterial breakdown of these very persistent environmental contaminants.