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--- bacteria:t3e:xopx [2025/02/13 12:52] – jfpothier
+++ bacteria:t3e:xopx [2025/07/24 22:54] (current) – jfpothier
@@ Line 2: / Line 2: @@
 Author: [[https://www.researchgate.net/profile/Lucas_Moriniere|Lucas Morinière]] & [[https://www.researchgate.net/profile/Sohini_Deb|Sohini Deb]]\\
-Internal reviewer: Coline Sciallano\\
+Internal reviewer: [[https://www.researchgate.net/profile/Coline-Sciallano|Coline Sciallano]]\\
-Expert reviewer: Ramesh V. Sonti
+Expert reviewer: [[https://www.researchgate.net/profile/Ramesh_Sonti|Ramesh V. Sonti]]\\
 Class: XopX\\
@@ Line 16: / Line 16: @@
 === How discovered? ===
-XopX was discovered through the screening of a genomic cosmid library of //X. euvesicatoria// strain GM98-38 conjugated in //X. campestris// pv. //campestris// that allowed //Xcc// to elicit an //Xcv // cell death-like response when inoculated on //N. benthamiana// (Metz // et al//., 2005).
+XopX was discovered through the screening of a genomic cosmid library of //X. euvesicatoria// strain GM98-38 conjugated in //X. campestris// pv. //campestris// that allowed //Xcc// to elicit an //Xcv// cell death-like response when inoculated on //N. benthamiana// (Metz //et al//., 2005).
 === (Experimental) evidence for being a T3E ===
 Translational fusions of XopX with the calmodulin-dependent adenylate cyclase domain of //Bordetella pertussis// (Cya) were exchanged by simple homologous recombination into the genomic copy of //xopX// of //X. euvesicatoria// strains 85* (constitutive //hrp// expression mutant), 85* Δ//hrcV// (T3SS-defective mutant) and wild-type GM98-38. All Cya fusion strains except 85* Δ//hrcV// still induced cell death response activity in //N. benthamiana//. Moreover, leaf extracts of //N. benthamiana// inoculated with these fusion strains were assayed for cAMP, and only strains with a functional T3SS showed an increase in cAMP levels due to translocation of the Cya reporter protein into the plant (Metz //et al//., 2005).
 === Regulation ===
 qRT-PCR revealed that transcript levels of 15 out of 18 tested non-TAL effector genes (as well as the regulatory genes //hrpG// and //hrpX//), including //xopX//, were significantly reduced in the //Xanthomonas oryzae// pv. //oryzae// Δ//xrvC// mutant compared with those in the wild-type strain PXO99<sup>A</sup> (Liu //et al.//, 2016).
 === Phenotypes ===
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   * During infection of rice (//Oryza sativa//) with //Xanthomonas oryzae// pv. //oryzae//, XopX was shown to be an inhibitor of rice innate immune response, as it suppresses LipA-induced callose deposition (Sinha //et al//., 2013).
   * XopX is required for the development of //X. euvesicatoria//- induced symptoms in the bacterial spot disease of tomato (//Solanum lycopersicum//) and pepper (//Capsicum annuum//). Indeed, it promotes ethylene production, and therefore chlorosis and plant cell death during infection by //X. euvesicatoria// of susceptible tomato and in transient expression assays in tobacco. Interestingly, it also suppresses flagellin-induced production of reactive oxygen species (ROS) while promoting the accumulation of pattern-triggered immunity (PTI) gene transcripts (Stork //et al//., 2015). Eventually, the complex behavior of XopX //in planta//, which combines activation and suppression of immunity-related plant responses at the same time, allows to classify this effector with the T3Es that activates the plant ‘default to death and defense’ response (Lindeberg //et al//., 2012; Stork //et al//., 2015).
-  *XopX is required for full virulence in //Xanthomonas axonopodis// pv. //manihotis//CIO151 strain. A //Xam// strain deleted for //xopX//  showed decreased ability to produce symptoms in leaves of cassava. Also, the// xopX //KO reached more than one log unit lower populations than those observed for the wild‐type strain. This underlies the importance of this effector for disease developement (Medina //et al//., 2018).
+  *XopX is required for full virulence in //Xanthomonas axonopodis// pv. //manihotis//CIO151 strain. A //Xam// strain deleted for //xopX//  showed decreased ability to produce symptoms in leaves of cassava. Also, the //xopX// KO reached more than one log unit lower populations than those observed for the wild‐type strain. This underlies the importance of this effector for disease developement (Medina //et al//., 2018).
   * When expressed in //Pseudomonas fluorescens// 55 (//Pf//55), a non‐pathogenic bacterium capable of eliciting PTI (callose deposit) in //Arabidopsis// Col‐0 plants, XopX is not able to reduce callose deposit, suggesting in these conditions, the effector is not able to suppress PTI. Using the same heterologuous system, XopX is not able to suppress the HR triggered by Pf 55 HopA1 on tobacco, suggesting that is these conditions, XopX do not act as an ETI suppressor. (Medina //et al//., 2018).
   * When transiently expressed in //N. benthamiana// by //Agrobacterium tumefaciens//–mediated expression system, XopX from //X. oryzae// pv. //oryzicola// cause the nonhost HR at approximately 2 days (Li //et al., //2015).
-  * A ∆//xopX// mutant strain of //Xanthomonas phaseoli// pv. //manihotis// (aka //Xanthomonas axonopodis// pv. //manihotis//) showed reduced growth //in planta// and delayed spread through the vasculature system of cassava (Mutka et al.//, 2016). //
+  * A ∆//xopX// mutant strain of //Xanthomonas phaseoli// pv. //manihotis// (aka //Xanthomonas axonopodis// pv. //manihotis//) showed reduced growth //in planta// and delayed spread through the vascular system of cassava (Mutka //et al.//, 2016).
-  * //Agrobacterium//-mediated transient expression of both //Xanthomonas oryzae // pv. //oryzae// XopQ and XopX in rice cells resulted in induction of rice immune responses. These immune responses were not observed when either protein was individually expressed in rice cells. XopQ-XopX induced rice immune responses were not observed with a XopX mutant that is defective in 14-3-3 binding (Deb //et al.//, 2020).
+  * //Agrobacterium//-mediated transient expression of both //Xanthomonas oryzae// pv. //oryzae// XopQ and XopX in rice cells resulted in induction of rice immune responses. These immune responses were not observed when either protein was individually expressed in rice cells. XopQ-XopX induced rice immune responses were not observed with a XopX mutant that is defective in 14-3-3 binding (Deb //et al.//, 2020).
   * A screen for //Xanthomonas oryzae// pv. //oryzae// effectors which can suppress XopQ-XopX induced rice immune responses, led to the identification of five effectors, namely XopU, XopV, XopP, XopG and AvrBs2, that could individually suppress these immune responses. These results suggest a complex interplay of //Xanthomonas// T3SS effectors in suppression of both pathogen-triggered immunity and effector-triggered immunity to promote virulence on rice (Deb //et al.//, 2020).
   *(ACD57163) is one among the five classes of virulence genes found to be upregulated in the //Xanthomonas oryzae// pv. //oryzae// MAI1 strain during infection. //xopX// was up-regulated at both 3 and 6 dai (Soto-Suárez //et al.//, 2010)
-  *The //xopX// gene contributes to the virulence of //Xanthomonas campestris// pv. //vesicatoria //on hosts pepper and tomato. XopX targets the innate immune response, resulting in enhanced plant disease susceptibility (Metz //et al//., 2005).
+  *The //xopX// gene contributes to the virulence of //Xanthomonas campestris// pv. //vesicatoria// on hosts pepper and tomato. XopX targets the innate immune response, resulting in enhanced plant disease susceptibility (Metz //et al//., 2005).
-  *A //Xanthomonas campestris//pv. //vesicatoria xopX// mutant strain could not induce cell death response in //N. benthamiana//, and could be complemented back to cell death response on //n. benthamiana// in trans with plasmid subclones of //xopX// (Metz //et al//., 2005).
+  *A //Xanthomonas campestris//pv. //vesicatoria xopX// mutant strain could not induce cell death response in //N. benthamiana//, and could be complemented back to cell death response on //N. benthamiana// in trans with plasmid subclones of //xopX// (Metz //et al//., 2005).
 === Localization ===
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 Salomon D, Dar D, Sreeramulu S, Sessa G (2011). Expression of //Xanthomonas campestris// pv. //vesicatoria// type III effectors in yeast affects cell growth and viability. Mol. Plant. Microbe Interact. 24: 305-314. DOI: [[https://doi.org/10.1094/MPMI-09-10-0196|10.1094/MPMI-09-10-0196]]
-Sinha D, Gupta MK, Patel HK, Ranjan A, Sonti RV (2013). Cell wall degrading enzyme induced rice innate immune responses are suppressed by the type 3 secretion system effectors XopN, XopQ, XopX and XopZ of //Xanthomonas oryzae //pv. //oryzae//. PLoS One 8: e75867. DOI: [[https://doi.org/10.1371/journal.pone.0075867|10.1371/journal.pone.0075867]]
+Sinha D, Gupta MK, Patel HK, Ranjan A, Sonti RV (2013). Cell wall degrading enzyme induced rice innate immune responses are suppressed by the type 3 secretion system effectors XopN, XopQ, XopX and XopZ of //Xanthomonas oryzae// pv. //oryzae//. PLoS One 8: e75867. DOI: [[https://doi.org/10.1371/journal.pone.0075867|10.1371/journal.pone.0075867]]
-Soto-Suárez M, Bernal D, González C, Szurek B, Guyot R, Tohme J, Verdier V. //In planta// gene expression analysis of //Xanthomonas oryzae //pathovar //oryzae//, African strain MAI1. BMC Microbiol. 2010 Jun 11;10:170. DOI: [[https://doi.org/10.1186/1471-2180-10-170|10.1186/1471-2180-10-170]].
+Soto-Suárez M, Bernal D, González C, Szurek B, Guyot R, Tohme J, Verdier V. //In planta// gene expression analysis of //Xanthomonas oryzae// pathovar //oryzae//, African strain MAI1. BMC Microbiol. 2010 Jun 11;10:170. DOI: [[https://doi.org/10.1186/1471-2180-10-170|10.1186/1471-2180-10-170]].
 Stork W, Kim JG, Mudgett MB (2015). Functional analysis of plant defense suppression and activation by the //Xanthomonas// core type III effector XopX. Mol. Plant. Microbe Interact. 28: 180-194. DOI: [[https://doi.org/10.1094/MPMI-09-14-0263-R|10.1094/MPMI-09-14-0263-R]]

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