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bacteria:t3e:xopaj [2024/08/06 14:18] – [XopAJ] rkoebnik | bacteria:t3e:xopaj [2025/02/12 23:32] (current) – jfpothier | ||
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- | ====== The Type III Effector XopAJ from Xanthomonas ====== | + | ====== The Type III Effector XopAJ from //Xanthomonas// ====== |
- | Authors: [[https:// | + | Authors: [[https:// |
Internal reviewer: [[https:// | Internal reviewer: [[https:// | ||
Expert reviewer: [[https:// | Expert reviewer: [[https:// | ||
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Synonym: AvrRxo1\\ | Synonym: AvrRxo1\\ | ||
3D structure: [[https:// | 3D structure: [[https:// | ||
- | |||
===== Biological function ===== | ===== Biological function ===== | ||
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=== Phenotypes === | === Phenotypes === | ||
- | * When introduced into //Xoo//, clones containing // | + | * When introduced into //Xoo//, clones containing //avrRxo1// induced an HR on maize with //Rxo1//, but not on maize without //Rxo1// (Zhao //et al.//, 2004). |
- | * // | + | * //Rxo1// has a nucleotide-binding site-leucine-rich repeat structure, similar to many previously identified //R// genes (Zhao //et al.//, 2005). //Rxo1// functions after transfer as a transgene to rice, demonstrating the feasibility of nonhost //R// gene transfer between cereals (Zhao //et al.//, 2005; Xie //et al.//, 2007). |
- | * AvrRxo1 is cytotoxic when expressed in yeast and caused chlorosis and patches of cell death in the infiltrated leaf areas upon transient expression in tomato and //Nicotiana benthamiana// | + | * AvrRxo1 is cytotoxic when expressed in yeast and caused chlorosis and patches of cell death in the infiltrated leaf areas upon transient expression in tomato and //Nicotiana benthamiana// |
- | * Variants of AvrRxo1 were found to suppress the HR caused by the non-host resistance recognition of // | + | * Variants of AvrRxo1 were found to suppress the HR caused by the non-host resistance recognition of //Xoo// by //N. benthamiana// |
- | * Among four // | + | * Among four //avrRxo1// alleles from different //Xoc// strains, toxicity is abolished by a single amino acid substitution at residue 344 in two AvrRxo1 variants (Liu //et al.//, 2014). |
* The ATP/GTP binding site motif A and the NLS are required for both the avirulence activity and the suppression of non-host resistance (Liu //et al.//, 2014). | * The ATP/GTP binding site motif A and the NLS are required for both the avirulence activity and the suppression of non-host resistance (Liu //et al.//, 2014). | ||
* AvrRxo1 has a T4 polynucleotide kinase domain and a structure homologous to that of Zeta toxins, and expression of AvrRxo1 suppresses bacterial growth in a manner dependent on the kinase motif (Han //et al.//, 2015). | * AvrRxo1 has a T4 polynucleotide kinase domain and a structure homologous to that of Zeta toxins, and expression of AvrRxo1 suppresses bacterial growth in a manner dependent on the kinase motif (Han //et al.//, 2015). | ||
* The gene product of the adjacent gene, AvrRxo1-ORF2 aka Arc1, suppresses the bacteriostatic activity of AvrRxo1 in bacterial cells (Han //et al.//, 2015). | * The gene product of the adjacent gene, AvrRxo1-ORF2 aka Arc1, suppresses the bacteriostatic activity of AvrRxo1 in bacterial cells (Han //et al.//, 2015). | ||
- | * AvrRxo1 and its binding partner Arc1 function as a toxin-antitoxin system when expressed in // | + | * AvrRxo1 and its binding partner Arc1 function as a toxin-antitoxin system when expressed in // |
- | * XopAJ< | + | * XopAJ< |
- | * AvrRxo1 is a kinase that converts NAD to 3' | + | * AvrRxo1 is a kinase that converts NAD to 3' |
* AvrRxo1 targets the cysteine protease RD21A, which is required for drought-induced immunity (Liu //et al.//, 2020). | * AvrRxo1 targets the cysteine protease RD21A, which is required for drought-induced immunity (Liu //et al.//, 2020). | ||
- | * AvrRxo1 enhances // | + | * AvrRxo1 enhances //Xoc// virulence and inhibits stomatal immunity by targeting and degrading rice OsPDX1 (pyridoxal phosphate synthase), thereby reducing vitamin B6 (VB6) levels in rice (Liu //et al.//, 2022). |
=== Localization === | === Localization === | ||
- | Transient expression of // | + | Transient expression of //avrRxo1// in onion cells after biolistic delivery revealed that the protein product was associated with the plasma membrane (Zhao //et al.//, 2004). However, later studies using fluorescently-tagged AvrRxo1 indicate localization in the nucleus and cytoplasm as well (Liu //et al//., 2014, Triplett //et al.//, 2016, Liu //et al.//, 2020). |
=== Enzymatic function === | === Enzymatic function === | ||
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AvrRxo1 has a T4 polynucleotide kinase domain (Han //et al.//, 2015; Wu //et al//., 2015). AvrRxo1 is an ATP-dependent protease (Liu //et al.//, 2022). | AvrRxo1 has a T4 polynucleotide kinase domain (Han //et al.//, 2015; Wu //et al//., 2015). AvrRxo1 is an ATP-dependent protease (Liu //et al.//, 2022). | ||
- | AvrRxo1 is a phosphotransferase that produces two novel metabolites by phosphorylating nicotinamide/ | + | AvrRxo1 is a phosphotransferase that produces two novel metabolites by phosphorylating nicotinamide/ |
- | AvrRxo1 phosphorylates NAD //in planta//, and its kinase catalytic sites are necessary for toxicity, suppression of PAMP-triggered immunity, and activation of Rxo1-mediated resistance (Shidore //et al.//, 2017). In a metabolomic profile, 3' | + | AvrRxo1 phosphorylates NAD //in planta//, and its kinase catalytic sites are necessary for toxicity, suppression of PAMP-triggered immunity, and activation of Rxo1-mediated resistance (Shidore //et al.//, 2017). In a metabolomic profile, 3' |
=== Interaction partners === | === Interaction partners === | ||
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The gene product of the adjacent gene, AvrRxo1-ORF2 aka Arc1, binds AvrRxo1, but binding is structurally different from typical effector-binding chaperones, in that it has a distinct fold containing a novel kinase-binding domain (Han //et al.//, 2015). | The gene product of the adjacent gene, AvrRxo1-ORF2 aka Arc1, binds AvrRxo1, but binding is structurally different from typical effector-binding chaperones, in that it has a distinct fold containing a novel kinase-binding domain (Han //et al.//, 2015). | ||
- | AvrRxo1 interacts with the // | + | AvrRxo1 interacts with the // |
AvrRxo1 interacts with OsPDX1.2 in a yeast two-hybrid assay and in planta, as assessed by split YFP and coIP assays (Liu //et al.//, 2022). | AvrRxo1 interacts with OsPDX1.2 in a yeast two-hybrid assay and in planta, as assessed by split YFP and coIP assays (Liu //et al.//, 2022). | ||
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Yes (e.g. //X. alfalfae//, //X. axonopodis//, | Yes (e.g. //X. alfalfae//, //X. axonopodis//, | ||
- | AvrRxo1 appears to be widely conserved in Asian strains of // | + | AvrRxo1 appears to be widely conserved in Asian strains of //Xoc// but much less present in African strains, which implies that deployment of // |
- | AvrRxo1 is conserved in nearly all strains of //X. euvesicatoria//, | + | AvrRxo1 is conserved in nearly all strains of //X. euvesicatoria//, |
=== In other plant pathogens/ | === In other plant pathogens/ | ||
- | Yes (// | + | Yes (// |
- | Homologs of the // | + | Homologs of the // |
===== Conservation ===== | ===== Conservation ===== | ||
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Yes (e.g. //X. alfalfae//, //X. axonopodis//, | Yes (e.g. //X. alfalfae//, //X. axonopodis//, | ||
- | AvrRxo1 appears to be widely conserved in Asian strains of // | + | AvrRxo1 appears to be widely conserved in Asian strains of //Xoc// but much less present in African strains, which implies that deployment of // |
- | AvrRxo1 is conserved in nearly all strains of //X. euvesicatoria//, | + | AvrRxo1 is conserved in nearly all strains of //X. euvesicatoria//, |
=== In other plant pathogens/ | === In other plant pathogens/ | ||
- | Yes (// | + | Yes (// |
- | Homologs of the // | + | Homologs of the // |
===== References ===== | ===== References ===== | ||
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Bahadur RP, Basak J (2014). Molecular modeling of protein-protein interaction to decipher the structural mechanism of nonhost resistance in rice. J. Biomol. Struct. Dyn. 32: 669-681. DOI: [[https:// | Bahadur RP, Basak J (2014). Molecular modeling of protein-protein interaction to decipher the structural mechanism of nonhost resistance in rice. J. Biomol. Struct. Dyn. 32: 669-681. DOI: [[https:// | ||
- | Han Q, Zhou C, Wu S, Liu Y, Triplett L, Miao J, Tokuhisa J, Deblais L, Robinson H, Leach JE, Li J, Zhao B (2015). Crystal structure of // | + | Han Q, Zhou C, Wu S, Liu Y, Triplett L, Miao J, Tokuhisa J, Deblais L, Robinson H, Leach JE, Li J, Zhao B (2015). Crystal structure of // |
Liu H, Chang Q, Feng W, Zhang B, Wu T, Li N, Yao F, Ding X, Chu Z (2014). Domain dissection of AvrRxo1 for suppressor, avirulence and cytotoxicity functions. PLoS One 9: e113875. DOI: [[https:// | Liu H, Chang Q, Feng W, Zhang B, Wu T, Li N, Yao F, Ding X, Chu Z (2014). Domain dissection of AvrRxo1 for suppressor, avirulence and cytotoxicity functions. PLoS One 9: e113875. DOI: [[https:// | ||
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Liu H, Lu C, Li Y, Wu T, Zhang B, Liu B, Feng W, Xu Q, Dong H, He S, Chu Z, Ding X (2022). The bacterial effector AvrRxo1 inhibits vitamin B6 biosynthesis to promote infection in rice. Plant Commun. 3: 100324. DOI: [[https:// | Liu H, Lu C, Li Y, Wu T, Zhang B, Liu B, Feng W, Xu Q, Dong H, He S, Chu Z, Ding X (2022). The bacterial effector AvrRxo1 inhibits vitamin B6 biosynthesis to promote infection in rice. Plant Commun. 3: 100324. DOI: [[https:// | ||
- | Liu Y, Wang K, Cheng Q, Kong D, Zhang X, Wang Z, Wang Q, Qi X, Yan J, Chu J, Ling H, Li Q, Miao J, Zhao B (2020). Cysteine protease RD21A regulated by E3 ligase SINAT4 is required for drought-induced resistance to // | + | Liu Y, Wang K, Cheng Q, Kong D, Zhang X, Wang Z, Wang Q, Qi X, Yan J, Chu J, Ling H, Li Q, Miao J, Zhao B (2020). Cysteine protease RD21A regulated by E3 ligase SINAT4 is required for drought-induced resistance to // |
- | Popov G, Fraiture M, Brunner F, Sessa G (2016). Multiple // | + | Popov G, Fraiture M, Brunner F, Sessa G (2016). Multiple // |
- | Salomon D, Dar D, Sreeramulu S, Sessa G (2011). Expression of // | + | Salomon D, Dar D, Sreeramulu S, Sessa G (2011). Expression of // |
Schuebel F, Rocker A, Edelmann D, Schessner J, Brieke C, Meinhart A (2016). 3' | Schuebel F, Rocker A, Edelmann D, Schessner J, Brieke C, Meinhart A (2016). 3' | ||
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Triplett LR, Shidore T, Long J, Miao J, Wu S, Han Q, Zhou C, Ishihara H, Li J, Zhao B, Leach JE (2016). AvrRxo1 Is a bifunctional type III secreted effector and toxin-antitoxin system component with homologs in diverse environmental contexts. PLoS One 11: e0158856. DOI: [[https:// | Triplett LR, Shidore T, Long J, Miao J, Wu S, Han Q, Zhou C, Ishihara H, Li J, Zhao B, Leach JE (2016). AvrRxo1 Is a bifunctional type III secreted effector and toxin-antitoxin system component with homologs in diverse environmental contexts. PLoS One 11: e0158856. DOI: [[https:// | ||
- | Wonni I, Cottyn B, Detemmerman L, Dao S, Ouedraogo L, Sarra S, Tekete C, Poussier S, Corral R, Triplett L, Koita O, Koebnik R, Leach J, Szurek B, Maes M, Verdier V (2014). Analysis of // | + | Wonni I, Cottyn B, Detemmerman L, Dao S, Ouedraogo L, Sarra S, Tekete C, Poussier S, Corral R, Triplett L, Koita O, Koebnik R, Leach J, Szurek B, Maes M, Verdier V (2014). Analysis of // |
- | Wu S (2015). Structural and functional characterization of a // | + | Wu S (2015). Structural and functional characterization of a // |
- | Xie XW, Yu J, Xu JL, Zhou YL, Li ZK (2007). Introduction of a non-host gene // | + | Xie XW, Yu J, Xu JL, Zhou YL, Li ZK (2007). Introduction of a non-host gene //Rxo1// cloned from maize resistant to rice bacterial leaf streak into rice varieties. Sheng Wu Gong Cheng Xue Bao [Chinese J. Biotechnol.] 23: 607-611. DOI: [[https:// |
- | Zhao B, Ardales EY, Raymundo A, Bai J, Trick HN, Leach JE, Hulbert SH (2004). The // | + | Zhao B, Ardales EY, Raymundo A, Bai J, Trick HN, Leach JE, Hulbert SH (2004). The //avrRxo1// gene from the rice pathogen // |
Zhao B, Lin X, Poland J, Trick H, Leach J, Hulbert S (2005). A maize resistance gene functions against bacterial streak disease in rice. Proc. Natl. Acad. Sci. USA 102: 15383-15388. DOI: [[https:// | Zhao B, Lin X, Poland J, Trick H, Leach J, Hulbert S (2005). A maize resistance gene functions against bacterial streak disease in rice. Proc. Natl. Acad. Sci. USA 102: 15383-15388. DOI: [[https:// | ||
+ | |||
+ | ===== Acknowledgements ===== | ||
+ | |||
+ | This fact sheet is based upon work from COST Action CA16107 EuroXanth, supported by COST (European Cooperation in Science and Technology). | ||