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Molecular Diagnosis and Diversity for Regulated Xanthomonas
Bacterial virulence factors
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Author: Isabel Rodrigues
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Class: XopH
Family: XopH
Prototype: XopH (Xanthomonas euvesicatoria pv. euvesicatoria, ex Xanthomonas campestris pv. vesicatoria)
RefSeq ID: WP_011037254.1 (104 aa)
Synonym: AvrBs1.1
3D structure: https://swissmodel.expasy.org/repository/uniprot/P0A0W1
The XopH effector, also known as AvrBs1.1 (White et al., 2009), was discovered due to its virulent activity (Gurenn et al., 2006). Later, this effector began to be identified based on the coregulation with the TTS system (Gurenn et al., 2006), most recently began to be identified by a combination of biochemical approaches, including a new NMR-based method to discriminate inositol polyphosphate enantiomers (Blüher et al., 2017).
The effector XopH, inhibited flg22-induced callose deposition in planta (Popov et al., 2016), dephosphorylates myo- inositol-hexakisphosphate (phytate, InsP6) in vitro and in vivo and enhanced disease symptoms (Blüher et al., 2017).
Unknown.
This effector can inhibit flg22- but not ABA-inducible reporter gene activation in protoplasts act as PTI inhibitors in planta and contribute to development of disease symptoms like chlorosis (Popov et al., 2016). XopH liberates phosphate from the plant tissue to improve the nutritional status of the pathogen what causes the plant show obvious symptoms of phosphorus deficiency (Blüher et al., 2017). Transgenic Nicotiana benthamiana plants constitutively expressing XopH were significantly smaller than transgenic GFP control plants of the same age and showed signs of early senescence indicating that the effector XopH might affect the ET pathway (Blüher et al., 2017). XopH sequester InsP6 by degrading it to an InsP5 isomer, which is not easily metabolized by the plant and accumulates what can compromise plant defense mechanism (Blüher et al., 2017).
The effector XopH is localized in the nucleus and in the cytoplasm of the plant cell (Popov et al., 2016; Blüher et al., 2017).
XopH is a T3E with phytate-degrading activity, in vitro and in planta (Blüher et al., 2017).
Unknown.
Yes (e.g. Xanthomonas campestris pv. campestris) (Potnis et al., 2012).
Unknown.
Blüher D, Laha D, Thieme S, Hofer A, Eschen-Lippold L, Masch A, Balcke G, Pavlovic I, Nagel O, Schonsky A, Hinkelmann R, Wörner J, Parvin N, Greiner R, Weber S, Tissier A, Schutkowski M, Lee J, Jessen H, Schaaf G, Bonas U (2017). A 1-phytase type III effector interferes with plant hormone signaling. Nat. Commun. 8: 2159. DOI: 10.1038/s41467-017-02195-8
Gurenn D, Thieme, F, Bonas U (2006). Type III effector proteins from the plant pathogen Xanthomonas and their role in the interaction with the host plant. J. Plant Physiol. 163: 233–255. DOI: 10.1016/j.jplph.2005.11.011
Popov G, Fraiture M, Brunner F, Sessa G (2016). Multiple Xanthomonas euvesicatoria type III effectors inhibit flg22-triggered immunity. Mol. Plant Microbe Interact. 29: 651-660. DOI: 10.1094/mpmi-07-16-0137-r
Potnis N, Minsavage G, Smith J K, Hurlbert J C, Norman D, Rodrigues R, Stall R E, Jones JB (2012). Avirulence proteins AvrBs7 from Xanthomonas gardneri and AvrBs1.1 from Xanthomonas euvesicatoria contribute to a novel gene-for-gene interaction in Pepper. Mol. Plant Microbe Interact. 25: 307-320. DOI: 10.1094/MPMI-08-11-0205
White FF, Potnis N, Jones JB, Koebnik R (2009). The type III effectors of Xanthomonas. Mol. Plant Pathol. 10: 749-766. DOI: 10.1111/J.1364-3703.2009.00590.X
Thieme F (2006). Genombasierte Identifizierung neuer potentieller Virulenzfaktoren von Xanthomonas campestris pv. vesicatoria. Doctoral Thesis, Martin-Luther-Universität Halle-Wittenberg, Germany. PDF: http://sundoc.bibliothek.uni-halle.de/diss-online/06/06H103/prom.pdf
Thieme F, Koebnik R, Bekel T, Berger C, Boch J, Büttner D, Caldana C, Gaigalat L, Goesmann A, Kay S, Kirchner O, Lanz C, Linke B, McHardy AC, Meyer F, Mittenhuber G, Nies DH, Niesbach-Klösgen U, Patschkowski T, Rückert C, Rupp O, Schneiker S, Schuster SC, Vorhölter FJ, Weber E, Pühler A, Bonas U, Bartels D, Kaiser O (2005). Insights into genome plasticity and pathogenicity of the plant pathogenic bacterium Xanthomonas campestris pv. vesicatoria revealed by the complete genome sequence. J. Bacteriol. 187: 7254-7266. DOI: 10.1128/JB.187.21.7254-7266.2005
