Xanthomonas citri
Xanthomonas citri is a Gram-negative, rod-shaped bacterium. Although it is harmless for humans, it is a phytopathogen, known for being the causing agent of citrus canker.
| Xanthomonas citri | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Phylum: | Pseudomonadota |
| Class: | Gammaproteobacteria |
| Order: | Xanthomonadales |
| Family: | Xanthomonadaceae |
| Genus: | Xanthomonas |
| Species: | X. citri |
| Binomial name | |
| Xanthomonas citri (Hasse 1915) Gabriel et al. 1989 | |
Bacterial killing via a secretion system
Xanthomonas citri uses its type IV secretion system to kill other Gram-negative bacterial species in a contact-dependent manner. The secretion of the effector proteins requires a conserved C-terminal domain, and its bacteriolytic activity is neutralized by a cognate immunity protein.[1][2]
Defense against predators
Xanthomonas citri also uses type VI secretion system in defense against the predatory amoeba Dictyostelium discoideum.[3]
References
- Souza DP, Oka GU, Alvarez-Martinez CE, Bisson-Filho AW, Dunger G, Hobeika L, Cavalcante NS, Alegria MC, Barbosa LR, Salinas RK, Guzzo CR, Farah CS (2015). "Bacterial killing via a type IV secretion system". Nature Communications. 6: 6453. Bibcode:2015NatCo...6.6453S. doi:10.1038/ncomms7453. PMID 25743609.
- Sgro GG, Costa TR, Cenens W, Souza DP, Cassago A, Coutinho de Oliveira L, Salinas RK, Portugal RV, Farah CS, Waksman G (2018). "Cryo-EM structure of the bacteria-killing type IV secretion system core complex from Xanthomonas citri". Nature Microbiology. 3 (12): 1429–1440. doi:10.1038/s41564-018-0262-z. PMC 6264810. PMID 30349081.
- Bayer-Santos, Ethel; Lima, Lídia dos Passos; Ceseti, Lucas de Moraes; Ratagami, Camila Yuri; de Santana, Eliane Silva; da Silva, Aline Maria; Farah, Chuck Shaker; Alvarez-Martinez, Cristina Elisa (2018). "Xanthomonas citri T6SS mediates resistance to Dictyostelium predation and is regulated by an ECF σ factor and cognate Ser/Thr kinase". Environmental Microbiology. 20 (4): 1562–1575. doi:10.1111/1462-2920.14085. ISSN 1462-2912. PMID 29488354. S2CID 3579518.
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