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bacteria:t3e:avrbs2 [2025/02/12 23:03] – jfpothier | bacteria:t3e:avrbs2 [2025/02/21 11:40] (current) – joana_costa | ||
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Transcriptome analysis (RNA-seq) and qRT-PCR have shown that //avrBs2// gene expression is downregulated in a //X. citri// pv. //citri// Δ//phoP// mutant, indicating that PhoP is a positive regulator of //avrBs2// expression (Wei //et al//., 2019). | Transcriptome analysis (RNA-seq) and qRT-PCR have shown that //avrBs2// gene expression is downregulated in a //X. citri// pv. //citri// Δ//phoP// mutant, indicating that PhoP is a positive regulator of //avrBs2// expression (Wei //et al//., 2019). | ||
- | 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 //avrBs2//, were significantly reduced in the // | + | 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 //avrBs2//, were significantly reduced in the // |
=== Phenotypes === | === Phenotypes === | ||
- | * The loss of a functional //avrBs2// gene was found to affect the fitness of //Xcv// and revealed fitness costs for three additional, plasmid-borne effector genes (// | + | * The loss of a functional // |
- | * AvrBs2 has been demonstrated to be required for full virulence of //Xcv//, //X. oryzae// pv. // | + | * AvrBs2 has been demonstrated to be required for full virulence of //Xcv//, //X. oryzae// |
- | * Recognition of //AvrBs2// by OsHRL makes rice more resistant against //X. oryzae// pv. // | + | * Recognition of // |
- | * It was shown in pepper and tomato lines without //Bs2// that mutations of catalytic residues in the glycerolphosphodiesterase did not interfere with the ability of the plant to recognize AvrBs2 through the cognate R gene //Bs2// and trigger disease resistance. This finding suggests that recognition of AvrBs2 is independent of its glycerolphosphodiesterase enzyme activity (Zhao //et al//., 2011). | + | * It was shown in pepper and tomato lines without // |
- | * AvrBs2 contributes to //X. oryzae// pv. // | + | * AvrBs2 contributes to //X. oryzae// |
- | * AvrBs2 transiently expressed in // | + | * AvrBs2 transiently expressed in // |
* Induced expression of AvrBs2 in transgenic cell cultures was shown to dramatically suppress flg22-induced and chitin-induced immune responses, such as ROS burst and PR gene expression (Li //et al//., 2015). | * Induced expression of AvrBs2 in transgenic cell cultures was shown to dramatically suppress flg22-induced and chitin-induced immune responses, such as ROS burst and PR gene expression (Li //et al//., 2015). | ||
- | * A ∆//xopK// mutant strain of // | + | * A ∆// |
- | * XopN and AvrBS2 were shown to significantly contribute to virulence of //X. oryzae// pv. // | + | * XopN and AvrBS2 were shown to significantly contribute to virulence of //X. oryzae// |
=== Localization === | === Localization === | ||
- | The //avrBs2// gene is chromosomal (Coplin, 1989). The AvrBs2 protein is translocated from bacterial cells into the plant cytosol. Subcellular localization of AvrBs2 was demonstrated using recombinant AvrBs2::GFP reporter fusions transiently expressed in rice protoplasts. Green fluorescence of AvrBs2::GFP was detected across the entire cell. Similar subcellular localization was observed in //Nicotiana benthamiana// | + | The // |
=== Enzymatic function === | === Enzymatic function === | ||
Line 51: | Line 51: | ||
=== Interaction partners === | === Interaction partners === | ||
- | Gene-for-gene relationship with corresponding resistance gene //Bs2// (Minsavage //et al//., 1990). Furthermore, | + | Gene-for-gene relationship with corresponding resistance gene // |
===== Conservation ===== | ===== Conservation ===== | ||
Line 71: | Line 71: | ||
=== (Experimental) evidence for being a T3E === | === (Experimental) evidence for being a T3E === | ||
- | AvrBs2 fused to the calmodulin-activated adenylate cyclase domain was shown to translocate into plant cells (cytosol), detected through rise of cAMP levels inside the plant tissue. The //hrpF// < | + | AvrBs2 fused to the calmodulin-activated adenylate cyclase domain was shown to translocate into plant cells (cytosol), detected through rise of cAMP levels inside the plant tissue. The // |
=== Regulation === | === 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 //avrBs2//, were significantly reduced in the // | + | qRT-PCR revealed that transcript levels of 15 out of 18 tested non-TAL effector genes (as well as the regulatory genes // |
- | Transcriptome analysis (RNA-seq) and qRT-PCR have shown that //avrBs2// gene expression is downregulated in a //X. citri// pv. //citri// Δ//phoP// mutant, indicating that PhoP is a positive regulator of //avrBs2// expression (Wei //et al//., 2019). | + | Transcriptome analysis (RNA-seq) and qRT-PCR have shown that // |
=== Phenotypes === | === Phenotypes === | ||
- | * AvrBs2 has been demonstrated to be required for full virulence of //X. euvesicatoria// | + | * AvrBs2 has been demonstrated to be required for full virulence of //X. euvesicatoria// |
- | * Recognition of AvrBs2 by OsHRL makes rice more resistant against //X. oryzae// pv. // | + | * Recognition of AvrBs2 by OsHRL makes rice more resistant against //X. oryzae// |
- | * It was shown in pepper and tomato lines without //Bs2 //that mutations of catalytic residues in the glycerolphosphodiesterase did not interfere with the ability of the plant to recognize AvrBs2 through the cognate R gene //Bs2// and trigger disease resistance. This finding suggests that recognition of AvrBs2 is independent of its glycerolphosphodiesterase enzyme activity (Zhao //et al//., 2011). | + | * It was shown in pepper and tomato lines without //Bs2 //that mutations of catalytic residues in the glycerolphosphodiesterase did not interfere with the ability of the plant to recognize AvrBs2 through the cognate R gene // |
- | * AvrBs2 contributes to //X. oryzae// pv. // | + | * AvrBs2 contributes to //X. oryzae// |
- | * AvrBs2 transiently expressed in // | + | * AvrBs2 transiently expressed in // |
* Induced expression of AvrBs2 in transgenic cell cultures was shown to dramatically suppress flg22-induced and chitin-induced immune responses, such as ROS burst and PR gene expression (Li //et al//., 2015). | * Induced expression of AvrBs2 in transgenic cell cultures was shown to dramatically suppress flg22-induced and chitin-induced immune responses, such as ROS burst and PR gene expression (Li //et al//., 2015). | ||
- | * A ∆//xopK// mutant strain of // | + | * A ∆// |
- | * // | + | * // |
=== Localization === | === Localization === | ||
- | The //avrBs2// gene is chromosomal (Coplin, 1989). The AvrBs2 protein is translocated from bacterial cells into the plant cytosol. Subcellular localization of AvrBs2 was demonstrated using recombinant AvrBs2::GFP reporter fusions transiently expressed in rice protoplasts. Green fluorescence of AvrBs2::GFP was detected across the entire cell. Similar subcellular localization was observed in //Nicotiana benthamiana// | + | The // |
=== Enzymatic function === | === Enzymatic function === | ||
Line 99: | Line 99: | ||
=== Interaction partners === | === Interaction partners === | ||
- | Gene-for-gene relationship with corresponding resistance gene //Bs2// (Minsavage //et al//., 1990). Furthermore, | + | Gene-for-gene relationship with corresponding resistance gene // |
===== Conservation ===== | ===== Conservation ===== | ||
Line 107: | Line 107: | ||
Yes (//e.g.//, //X//. // | Yes (//e.g.//, //X//. // | ||
- | Field strains of //X. euvesicatoria// | + | Field strains of //X. euvesicatoria// |
=== In other plant pathogens/ | === In other plant pathogens/ | ||
Line 121: | Line 121: | ||
Coplin DL (1989). Plasmids and their role in the evolution of plant pathogenic bacteria. Ann. Rev. Phytopathol. 27: 187-212. DOI: [[https:// | Coplin DL (1989). Plasmids and their role in the evolution of plant pathogenic bacteria. Ann. Rev. Phytopathol. 27: 187-212. DOI: [[https:// | ||
- | Deb S, Ghosh P, Patel HK, Sonti RV (2020). Interaction of the // | + | Deb S, Ghosh P, Patel HK, Sonti RV (2020). Interaction of the // |
- | Gassmann W, Dahlbeck D, Chesnokova O, Minsavage GV, Jones JB, Staskawicz BJ (2000). Molecular evolution of virulence in natural field strains of // | + | Gassmann W, Dahlbeck D, Chesnokova O, Minsavage GV, Jones JB, Staskawicz BJ (2000). Molecular evolution of virulence in natural field strains of // |
Ghosh P (2004). Process of protein transport by the type III secretion system. Microbiol. Mol. Biol. Rev. 68: 771-795. DOI: [[https:// | Ghosh P (2004). Process of protein transport by the type III secretion system. Microbiol. Mol. Biol. Rev. 68: 771-795. DOI: [[https:// | ||
Line 129: | Line 129: | ||
Habyarimana F, Ahmer BM (2013). More evidence for secretion signals within the mRNA of type 3 secreted effectors. J. Bacteriol. 195: 2117-2118. DOI: [[https:// | Habyarimana F, Ahmer BM (2013). More evidence for secretion signals within the mRNA of type 3 secreted effectors. J. Bacteriol. 195: 2117-2118. DOI: [[https:// | ||
- | Ignatov AN, Monakhos GF, Dzhalilov FS, Pozmogova GV (2002). Avirulence gene from // | + | Ignatov AN, Monakhos GF, Dzhalilov FS, Pozmogova GV (2002). Avirulence gene from // |
- | Kearney B, Staskawicz BJ (1990). Widespread distribution and fitness contribution of // | + | Kearney B, Staskawicz BJ (1990). Widespread distribution and fitness contribution of // |
- | Li S, Wang Y, Wang S, Fang A, Wang J, Liu L, Zhang K, Mao Y, Sun W (2015). The type III effector AvrBs2 in // | + | Li S, Wang Y, Wang S, Fang A, Wang J, Liu L, Zhang K, Mao Y, Sun W (2015). The type III effector AvrBs2 in // |
- | Liao ZX, Li JY, Mo XY, Ni Z, Jiang W, He YQ, Huang S (2020). Type III effectors //xopN// and //avrBS2// contribute to the virulence of // | + | Liao ZX, Li JY, Mo XY, Ni Z, Jiang W, He YQ, Huang S (2020). Type III effectors // |
- | Liu Y, Long J, Shen D, Song C (2016). // | + | Liu Y, Long J, Shen D, Song C (2016). // |
- | Medina CA, Reyes PA, Trujillo CA, Gonzalez JL, Bejarano DA, Montenegro NA, Jacobs JM, Joe A, Restrepo S, Alfano JR, Bernal A (2018). The role of type III effectors from // | + | Medina CA, Reyes PA, Trujillo CA, Gonzalez JL, Bejarano DA, Montenegro NA, Jacobs JM, Joe A, Restrepo S, Alfano JR, Bernal A (2018). The role of type III effectors from // |
- | Minsavage GV, Dahlbeck D, Whalen MC, Kearney B, Bonas U, Staskawicz BJ, Stall RE (1990). Gene-for-gene relationships specifying disease resistance in // | + | Minsavage GV, Dahlbeck D, Whalen MC, Kearney B, Bonas U, Staskawicz BJ, Stall RE (1990). Gene-for-gene relationships specifying disease resistance in // |
- | Mudgett MB, Chesnokova O, Dahlbeck D, Clark ET, Rossier O, Bonas U, Staskawicz BJ (2000). Molecular signals required for type III secretion and translocation of the // | + | Mudgett MB, Chesnokova O, Dahlbeck D, Clark ET, Rossier O, Bonas U, Staskawicz BJ (2000). Molecular signals required for type III secretion and translocation of the // |
Mutka AM, Fentress SJ, Sher JW, Berry JC, Pretz C, Nusinow DA, Bart R (2016). Quantitative, | Mutka AM, Fentress SJ, Sher JW, Berry JC, Pretz C, Nusinow DA, Bart R (2016). Quantitative, | ||
- | Park SR, Moon SJ, Shin DJ, Kim MG, Hwang DJ, Bae SC, Kim JG , Yi BY, Byun MO (2010). Isolation and characterization of rice //OsHRL// gene related to bacterial blight resistance. Plant Pathol. J. 26: 417-420. DOI: [[https:// | + | Park SR, Moon SJ, Shin DJ, Kim MG, Hwang DJ, Bae SC, Kim JG , Yi BY, Byun MO (2010). Isolation and characterization of rice // |
- | Roden JA, Belt B, Ross JB, Tachibana T, Vargas J, Mudgett MB (2004). A genetic screen to isolate type III effectors translocated into pepper cells during // | + | Roden JA, Belt B, Ross JB, Tachibana T, Vargas J, Mudgett MB (2004). A genetic screen to isolate type III effectors translocated into pepper cells during // |
- | Swords KM, Dahlbeck D, Kearney B, Roy M, Staskawicz BJ (1996). Spontaneous and induced mutations in a single open reading frame alter both virulence and avirulence in // | + | Swords KM, Dahlbeck D, Kearney B, Roy M, Staskawicz BJ (1996). Spontaneous and induced mutations in a single open reading frame alter both virulence and avirulence in // |
- | Wei C, Ding T, Chang C, Yu C, Li X, Liu Q (2019). Global regulator PhoP is necessary for motility, biofilm formation, exoenzyme production and virulence of // | + | Wei C, Ding T, Chang C, Yu C, Li X, Liu Q (2019). Global regulator PhoP is necessary for motility, biofilm formation, exoenzyme production and virulence of // |
- | Wichmann G, Bergelson J (2004). Effector genes of // | + | Wichmann G, Bergelson J (2004). Effector genes of // |
- | Wichmann G, Ritchie D, Kousik CS, Bergelson J (2005). Reduced genetic variation occurs among genes of the highly clonal plant pathogen // | + | Wichmann G, Ritchie D, Kousik CS, Bergelson J (2005). Reduced genetic variation occurs among genes of the highly clonal plant pathogen // |
- | Zhao B, Dahlbeck D, Krasileva KV, Fong RW, Staskawicz BJ (2011). Computational and biochemical analysis of the // | + | Zhao B, Dahlbeck D, Krasileva KV, Fong RW, Staskawicz BJ (2011). Computational and biochemical analysis of the // |
===== Further reading ===== | ===== Further reading ===== | ||
- | Timilsina S, Abrahamian P, Potnis N, Minsavage GV, White FF, Staskawicz BJ, Jones JB, Vallad GE, Goss EM (2016). Analysis of sequenced genomes of // | + | Timilsina S, Abrahamian P, Potnis N, Minsavage GV, White FF, Staskawicz BJ, Jones JB, Vallad GE, Goss EM (2016). Analysis of sequenced genomes of // |
===== Acknowledgements ===== | ===== Acknowledgements ===== |