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bacteria:t3e:avrbs2 [2020/07/13 14:00]
rkoebnik 		bacteria:t3e:avrbs2 [2020/07/17 10:32] (current)
rkoebnik [Biological function]
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 Prototype: AvrBs2 (//Xanthomonas euvesicatoria// pv. //euvesicatoria//, ex //Xanthomonas campestris// pv. //vesicatoria//; strain 85-10)\\ Prototype: AvrBs2 (//Xanthomonas euvesicatoria// pv. //euvesicatoria//, ex //Xanthomonas campestris// pv. //vesicatoria//; strain 85-10)\\
 RefSeq ID: [[https://www.ncbi.nlm.nih.gov/protein/WP_011345810.1|WP_011345810.1]] (714 aa)\\ RefSeq ID: [[https://www.ncbi.nlm.nih.gov/protein/WP_011345810.1|WP_011345810.1]] (714 aa)\\
-Synonym: //avrRxc1/3// (Ignatov //et al.//, 2002)\\+Synonym: AvrRxc1/3 (Ignatov //et al.//, 2002)\\
 3D structure: Unknown 3D structure: Unknown
  
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   * AvrBs2 transiently expressed in //Arabidopsis//  protoplasts suppressed flg22-induced NHO1 expression (Li //et al//., 2015).   * AvrBs2 transiently expressed in //Arabidopsis//  protoplasts suppressed flg22-induced NHO1 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).   * 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 //Xanthomonas phaseoli//  pv. //manihotis//  (aka //Xanthomonas axonopodis//  pv. //manihotis//) showed reduced growth in planta and delayed spread through the vasculature system of cassava. Moreover, the ∆avrBs2 mutant strain exhibited reduced water-soaking symptoms at the site of inoculation (Mutka //et al.//, 2016).+  * A ∆//xopK//  mutant strain of //Xanthomonas phaseoli//  pv. //manihotis//  showed reduced growth in planta and delayed spread through the vasculature system of cassava. Moreover, the ∆//avrBs2//  mutant strain exhibited reduced water-soaking symptoms at the site of inoculation (Mutka //et al.//, 2016).
  
 === Localization === === Localization ===
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 Indirectly – the pathovars that induced //Bs2//-mediated hypersensitivity were classified as having AvrBs2 activity (Kearney & Staskawicz, 1990). Indirectly – the pathovars that induced //Bs2//-mediated hypersensitivity were classified as having AvrBs2 activity (Kearney & Staskawicz, 1990).
- 
 === (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//  <sup>-</sup>   mutant was used as a negative control to prove the translocation process. Further it was shown that AvrBs2 contains two N-terminal secretion and translocation signals: first for secretion and the second for enhancing translocation (Casper-Lindley //et al//., 2002). +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// <sup>-</sup>  mutant was used as a negative control to prove the translocation process. Further it was shown that AvrBs2 contains two N-terminal secretion and translocation signals: first for secretion and the second for enhancing translocation (Casper-Lindley //et al//., 2002).
 === 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 //Xanthomonas oryzae//  pv. //oryzae//  Δ//xrvC//  mutant compared with those in the wild-type strain PXO99<sup>A</sup>   (Liu //et al//., 2016). +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 //Xanthomonas oryzae// pv. //oryzae// Δ//xrvC// mutant compared with those in the wild-type strain PXO99<sup>A</sup>  (Liu //et al//., 2016).
- +
-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).
 === Phenotypes === === Phenotypes ===
  
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   * 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 //Xanthomonas phaseoli//  pv. //manihotis//  (aka //Xanthomonas axonopodis//  pv. //manihotis//) showed reduced growth in planta and delayed spread through the vasculature system of cassava. Moreover, the ∆avrBs2 mutant strain exhibited reduced water-soaking symptoms at the site of inoculation (Mutka //et al.//, 2016).   * A ∆//xopK//  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. Moreover, the ∆avrBs2 mutant strain exhibited reduced water-soaking symptoms at the site of inoculation (Mutka //et al.//, 2016).
 +  * //Agrobacterium//-mediated transient expression of both XopQ and XopX in rice cells resulted in induction of rice immune responses, which were not observed when either protein was individually expressed. A screen for //Xanthomonas//  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).
 === Localization === === Localization ===
  
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 Yes (//e.g.//, //X//. //arboricola//, //X//. //campestris//, //X//. //citri//, //X. euvesicatoria//, //X//. //fuscans//, //X. oryzae//, //X//. //phaseoli//). Yes (//e.g.//, //X//. //arboricola//, //X//. //campestris//, //X//. //citri//, //X. euvesicatoria//, //X//. //fuscans//, //X. oryzae//, //X//. //phaseoli//).
  
-Field strains of //X. euvesicatoria//  pv. //euvesicatoria//  and //X//. //campestris//  pv. //campestris//  were found to accumulate mutations in the //avrBs2/////avrRxc1/3//  gene in order to overcome //Bs2/////Rxc1/////Rxc3//-mediated resistance (Swords //et al.//, 1996; Gassmann //et al.//, 2000; Ignatov //et al.//, 2002). +Field strains of //X. euvesicatoria// pv. //euvesicatoria// and //X//. //campestris// pv. //campestris// were found to accumulate mutations in the //avrBs2/////avrRxc1/3// gene in order to overcome //Bs2/////Rxc1/////Rxc3//-mediated resistance (Swords //et al.//, 1996; Gassmann //et al.//, 2000; Ignatov //et al.//, 2002). Yet, the global //Xcv// population was found to be extremely clonal, with very little genetic variation throughout the chromosome, including //avrBs2// and the plasmid-borne //avrBs1//, a finding that is consistent with recent evolution or population expansion of the species (Wichmann //et al.//, 2005).
 === In other plant pathogens/symbionts === === In other plant pathogens/symbionts ===
  
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 Coplin DL (1989). Plasmids and their role in the evolution of plant pathogenic bacteria. Ann. Rev. Phytopathol. 27: 187-212. DOI: [[https://doi.org/10.1146/annurev.py.27.090189.001155|10.1146/annurev.py.27.090189.001155]] Coplin DL (1989). Plasmids and their role in the evolution of plant pathogenic bacteria. Ann. Rev. Phytopathol. 27: 187-212. DOI: [[https://doi.org/10.1146/annurev.py.27.090189.001155|10.1146/annurev.py.27.090189.001155]]
  
-Gassmann W, Dahlbeck D, Chesnokova O, Minsavage GV, Jones JB, Staskawicz BJ (2000). Molecular evolution of virulence in natural field strains of //Xanthomonas campestris//  pv. //vesicatoria//. J. Bacteriol. 182: 7053-7059. DOI: [[https://doi.org/10.1128/jb.182.24.7053-7059.2000|10.1128/jb.182.24.7053-7059.2000]]+Deb S, Ghosh P, Patel HK, Sonti RV (2020). Interaction of the //Xanthomonas// effectors XopQ and XopX results in induction of rice immune responses. Plant J., in press. DOI: [[https://doi.org/10.1111/tpj.14924|10.1111/tpj.14924]] 
 + 
 +Gassmann W, Dahlbeck D, Chesnokova O, Minsavage GV, Jones JB, Staskawicz BJ (2000). Molecular evolution of virulence in natural field strains of //Xanthomonas campestris// pv. //vesicatoria//. J. Bacteriol. 182: 7053-7059. DOI: [[https://doi.org/10.1128/jb.182.24.7053-7059.2000|10.1128/jb.182.24.7053-7059.2000]]
  
 Ghosh P (2004). Process of protein transport by the type III secretion system. Microbiol. Mol. Biol. Rev. 68: 771-795. DOI: [[https://doi.org/10.1128/MMBR.68.4.771-795.2004|10.1128/MMBR.68.4.771-795.2004]] Ghosh P (2004). Process of protein transport by the type III secretion system. Microbiol. Mol. Biol. Rev. 68: 771-795. DOI: [[https://doi.org/10.1128/MMBR.68.4.771-795.2004|10.1128/MMBR.68.4.771-795.2004]]
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 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://doi.org/10.1128/JB.00303-13|10.1128/JB.00303-13]] 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://doi.org/10.1128/JB.00303-13|10.1128/JB.00303-13]]
  
-Ignatov AN, Monakhos GF, Dzhalilov FS, Pozmogova GV (2002). Avirulence gene from //Xanthomonas campestris //pv. //campestris//  homologous to the //avrBs2//  locus is recognized in race-specific reaction by two different resistance genes in Brassicas. Genetika 38: 1656-1662 [Article in Russian] / Russian J. Genet. 38: 1404-1410. DOI: [[https://doi.org/10.1023/A:1021643907032|10.1023/A:1021643907032]]+Ignatov AN, Monakhos GF, Dzhalilov FS, Pozmogova GV (2002). Avirulence gene from //Xanthomonas campestris //pv. //campestris// homologous to the //avrBs2// locus is recognized in race-specific reaction by two different resistance genes in Brassicas. Genetika 38: 1656-1662 [Article in Russian] / Russian J. Genet. 38: 1404-1410. DOI: [[https://doi.org/10.1023/A:1021643907032|10.1023/A:1021643907032]]
  
-Kearney B, Staskawicz BJ (1990). Widespread distribution and fitness contribution of //Xanthomonas campestris//  avirulence gene //avrBs2//. Nature 346: 385-386. DOI: [[https://doi.org/10.1038/346385a0|10.1038/346385a0]]+Kearney B, Staskawicz BJ (1990). Widespread distribution and fitness contribution of //Xanthomonas campestris// avirulence gene //avrBs2//. Nature 346: 385-386. DOI: [[https://doi.org/10.1038/346385a0|10.1038/346385a0]]
  
-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 //Xanthomonas oryzae//  pv. //oryzicola//  suppresses rice immunity and promotes disease development. Mol. Plant Microbe Interact. 28: 869-880. DOI: [[https://doi.org/10.1094/MPMI-10-14-0314-R|10.1094/MPMI-10-14-0314-R]]+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 //Xanthomonas oryzae// pv. //oryzicola// suppresses rice immunity and promotes disease development. Mol. Plant Microbe Interact. 28: 869-880. DOI: [[https://doi.org/10.1094/MPMI-10-14-0314-R|10.1094/MPMI-10-14-0314-R]]
  
-Liu Y, Long J, Shen D, Song C (2016). //Xanthomonas oryzae//  pv. //oryzae//  requires H-NS-family protein XrvC to regulate virulence during rice infection. FEMS Microbiol. Lett. 363: fnw067. DOI: [[https://doi.org/10.1093/femsle/fnw067|10.1093/femsle/fnw067]]+Liu Y, Long J, Shen D, Song C (2016). //Xanthomonas oryzae// pv. //oryzae// requires H-NS-family protein XrvC to regulate virulence during rice infection. FEMS Microbiol. Lett. 363: fnw067. DOI: [[https://doi.org/10.1093/femsle/fnw067|10.1093/femsle/fnw067]]
  
-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 //Xanthomonas axonopodis//  pv. //manihotis//  in virulence and suppression of plant immunity. Mol. Plant Pathol. 19: 593-606. DOI: [[https://doi.org/10.1111/mpp.12545|10.1111/mpp.12545]]+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 //Xanthomonas axonopodis// pv. //manihotis// in virulence and suppression of plant immunity. Mol. Plant Pathol. 19: 593-606. DOI: [[https://doi.org/10.1111/mpp.12545|10.1111/mpp.12545]]
  
-Minsavage GV, Dahlbeck D, Whalen MC, Kearney B, Bonas U, Staskawicz BJ, Stall RE (1990). Gene-for-gene relationships specifying disease resistance in //Xanthomonas campestris//  pv. //vesicatoria//-pepper interactions. Mol. Plant Microbe Interact. 3: 41-47. DOI: [[https://doi.org/10.1094/MPMI-3-041|10.1094/MPMI-3-041]]+Minsavage GV, Dahlbeck D, Whalen MC, Kearney B, Bonas U, Staskawicz BJ, Stall RE (1990). Gene-for-gene relationships specifying disease resistance in //Xanthomonas campestris// pv. //vesicatoria//-pepper interactions. Mol. Plant Microbe Interact. 3: 41-47. DOI: [[https://doi.org/10.1094/MPMI-3-041|10.1094/MPMI-3-041]]
  
-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 //Xanthomonas campestris//  AvrBs2 protein to pepper plants. Proc. Natl. Acad. Sci. USA 97: 13324-13329. DOI: [[https://doi.org/10.1073/pnas.230450797|10.1073/pnas.230450797]]+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 //Xanthomonas campestris// AvrBs2 protein to pepper plants. Proc. Natl. Acad. Sci. USA 97: 13324-13329. DOI: [[https://doi.org/10.1073/pnas.230450797|10.1073/pnas.230450797]]
  
 Mutka AM, Fentress SJ, Sher JW, Berry JC, Pretz C, Nusinow DA, Bart R (2016). Quantitative, image-based phenotyping methods provide insight into spatial and temporal dimensions of plant disease. Plant Physiol. 172: 650-660. DOI: [[https://doi.org/10.1104/pp.16.00984|10.1104/pp.16.00984]] Mutka AM, Fentress SJ, Sher JW, Berry JC, Pretz C, Nusinow DA, Bart R (2016). Quantitative, image-based phenotyping methods provide insight into spatial and temporal dimensions of plant disease. Plant Physiol. 172: 650-660. DOI: [[https://doi.org/10.1104/pp.16.00984|10.1104/pp.16.00984]]
  
-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://doi.org/10.5423/PPJ.2010.26.4.417|10.5423/PPJ.2010.26.4.417]]+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://doi.org/10.5423/PPJ.2010.26.4.417|10.5423/PPJ.2010.26.4.417]]
  
-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 //Xanthomonas//  infection. Proc. Natl. Acad. Sci. USA 101: 16624-16629. DOI: [[https://doi.org/10.1073/pnas.0407383101|10.1073/pnas.0407383101]]+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 //Xanthomonas// infection. Proc. Natl. Acad. Sci. USA 101: 16624-16629. DOI: [[https://doi.org/10.1073/pnas.0407383101|10.1073/pnas.0407383101]]
  
-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 //Xanthomonas campestris//  pv. //vesicatoria//  //avrBs2//. J. Bacteriol. 178: 4661-4669. DOI: [[https://doi.org/10.1128/jb.178.15.4661-4669.1996|10.1128/jb.178.15.4661-4669.1996]]+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 //Xanthomonas campestris// pv. //vesicatoria// //avrBs2//. J. Bacteriol. 178: 4661-4669. DOI: [[https://doi.org/10.1128/jb.178.15.4661-4669.1996|10.1128/jb.178.15.4661-4669.1996]]
  
-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 //Xanthomonas citri//  subsp. //citri//  on citrus plants. Genes 10: 340. DOI: [[https://doi.org/10.3390/genes10050340|10.3390/genes10050340]]+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 //Xanthomonas citri// subsp. //citri// on citrus plants. Genes 10: 340. DOI: [[https://doi.org/10.3390/genes10050340|10.3390/genes10050340]]
  
-Wichmann G, Bergelson J (2004). Effector genes of //Xanthomonas axonopodis//  pv. //vesicatoria//  promote transmission and enhance other fitness traits in the field. Genetics 166: 693-706. DOI: [[https://doi.org/10.1534/genetics.166.2.693|10.1534/genetics.166.2.693]] FIXME+Wichmann G, Bergelson J (2004). Effector genes of //Xanthomonas axonopodis// pv. //vesicatoria// promote transmission and enhance other fitness traits in the field. Genetics 166: 693-706. DOI: [[https://doi.org/10.1534/genetics.166.2.693|10.1534/genetics.166.2.693]]
  
-Wichmann G, Ritchie D, Kousik CS, Bergelson J (2005). Reduced genetic variation occurs among genes of the highly clonal plant pathogen //Xanthomonas axonopodis//  pv. //vesicatoria//, including the effector gene //avrBs2//. Appl. Environ. Microbiol. 71: 2418-2432. DOI: [[https://doi.org/10.1128/AEM.71.5.2418-2432.2005|10.1128/AEM.71.5.2418-2432.2005]] FIXME+Wichmann G, Ritchie D, Kousik CS, Bergelson J (2005). Reduced genetic variation occurs among genes of the highly clonal plant pathogen //Xanthomonas axonopodis// pv. //vesicatoria//, including the effector gene //avrBs2//. Appl. Environ. Microbiol. 71: 2418-2432. DOI: [[https://doi.org/10.1128/AEM.71.5.2418-2432.2005|10.1128/AEM.71.5.2418-2432.2005]]
  
-Zhao B, Dahlbeck D, Krasileva KV, Fong RW, Staskawicz BJ (2011). Computational and biochemical analysis of the //Xanthomonas//  effector AvrBs2 and its role in the modulation of //Xanthomonas//  type three effector delivery. PLoS Pathog. 7: e1002408. DOI: [[https://doi.org/10.1371/journal.ppat.1002408|10.1371/journal.ppat.1002408]]+Zhao B, Dahlbeck D, Krasileva KV, Fong RW, Staskawicz BJ (2011). Computational and biochemical analysis of the //Xanthomonas// effector AvrBs2 and its role in the modulation of //Xanthomonas// type three effector delivery. PLoS Pathog. 7: e1002408. DOI: [[https://doi.org/10.1371/journal.ppat.1002408|10.1371/journal.ppat.1002408]]
  
 ===== Further reading ===== ===== Further reading =====
bacteria/t3e/avrbs2.1594641634.txt.gz · Last modified: 2020/07/13 14:00 by rkoebnik

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