Abstract:
:The two-partner secretion system ExlBA, expressed by strains of Pseudomonas aeruginosa belonging to the PA7 group, induces hemorrhage in lungs due to disruption of host cellular membranes. Here we demonstrate that the exlBA genes are controlled by a pathway consisting of cAMP and the virulence factor regulator (Vfr). Upon interaction with cAMP, Vfr binds directly to the exlBA promoter with high affinity (equilibrium binding constant [Keq] of ≈2.5 nM). The exlB and exlA expression was diminished in the Vfr-negative mutant and upregulated with increased intracellular cAMP levels. The Vfr binding sequence in the exlBA promoter was mutated in situ, resulting in reduced cytotoxicity of the mutant, showing that Vfr is required for the exlBA expression during intoxication of epithelial cells. Vfr also regulates function of type 4 pili previously shown to facilitate ExlA activity on epithelial cells, which indicates that the cAMP/Vfr pathway coordinates these two factors needed for full cytotoxicity. As in most P. aeruginosa strains, the adenylate cyclase CyaB is the main provider of cAMP for Vfr regulation during both in vitro growth and eukaryotic cell infection. We discovered that the absence of functional Vfr in the reference strain PA7 is caused by a frameshift in the gene and accounts for its reduced cytotoxicity, revealing the conservation of ExlBA control by the CyaB-cAMP/Vfr pathway in P. aeruginosa taxonomic outliers.IMPORTANCE The human opportunistic pathogen Pseudomonas aeruginosa provokes severe acute and chronic human infections associated with defined sets of virulence factors. The main virulence determinant of P. aeruginosa taxonomic outliers is exolysin, a membrane-disrupting pore-forming toxin belonging to the two-partner secretion system ExlBA. In this work, we demonstrate that the conserved CyaB-cAMP/Vfr pathway controls cytotoxicity of outlier clinical strains through direct transcriptional activation of the exlBA operon. Therefore, despite the fact that the type III secretion system and exolysin are mutually exclusive in classical and outlier strains, respectively, these two major virulence determinants share similarities in their mechanisms of regulation.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Berry A,Han K,Trouillon J,Robert-Genthon M,Ragno M,Lory S,Attrée I,Elsen Sdoi
10.1128/JB.00135-18subject
Has Abstractpub_date
2018-05-24 00:00:00issue
12eissn
0021-9193issn
1098-5530pii
JB.00135-18journal_volume
200pub_type
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journal_title:Journal of bacteriology
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doi:10.1128/jb.169.12.5808-5814.1987
更新日期:1987-12-01 00:00:00
abstract::The Salmonella effector protein SopA is translocated into host cells via the SPI-1 type III secretion system (TTSS) and contributes to enteric disease. We found that the chaperone InvB binds to SopA and slightly stabilizes it in the bacterial cytosol and that it is required for its transport via the SPI-1 TTSS. ...
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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doi:10.1128/jb.171.9.5141-5147.1989
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doi:10.1128/jb.174.11.3637-3644.1992
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journal_title:Journal of bacteriology
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doi:10.1128/jb.177.20.5891-5898.1995
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
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doi:10.1128/JB.145.1.479-488.1981
更新日期:1981-01-01 00:00:00
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更新日期:1991-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.86.4.673-680.1963
更新日期:1963-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.173.9.2879-2887.1991
更新日期:1991-05-01 00:00:00
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journal_title:Journal of bacteriology
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doi:10.1128/jb.168.2.775-779.1986
更新日期:1986-11-01 00:00:00
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更新日期:2005-04-01 00:00:00
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更新日期:1970-09-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.164.2.947-949.1985
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journal_title:Journal of bacteriology
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doi:10.1128/JB.96.2.544-553.1968
更新日期:1968-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.142.1.366-368.1980
更新日期:1980-04-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1976-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2007-03-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2020-11-04 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.172.2.802-807.1990
更新日期:1990-02-01 00:00:00
abstract::A novel method is described that allows a direct determination of the location of a portion of the dipicolinic acid (DPA) in spores. Ultraviolet (UV) irradiation is shown to cause cross-linkage of DPA to spore proteins which have the characteristics of membrane proteins. We suggest that DPA resides in the inner foresp...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.118.1.202-208.1974
更新日期:1974-04-01 00:00:00