Crossref journal-article
American Society for Microbiology
Infection and Immunity (235)
Abstract

ABSTRACTTheYersiniaplasmid-encoded Yop virulon enables extracellular adhering bacteria to deliver toxic effector proteins inside their target cells. It includes a type III secretion system (Ysc), at least two translocator proteins (YopB, YopD), and a set of intracellular Yop effectors (YopE, YopH, YopO, YopM, and YopP). Infection of macrophages with a wild-type strain leads to low levels of tumor necrosis factor alpha (TNF-α) release compared to infection with plasmid-cured strains, suggesting that the virulence plasmid encodes a factor impairing the normal TNF-α response of infected macrophages. This effect is correlated with the inhibition of the macrophage mitogen-activated protein kinase (MAPK) activities. To identify the Yop protein responsible for the suppression of TNF-α release, we infected J774A.1 and PU5-1.8 macrophages with a battery of knockoutYersinia enterocoliticamutants and we quantified the TNF-α released. Mutants affected in secretion (yscN), in translocation (yopBandyopD), or in synthesis of all the known Yop effectors (yopH,yopO,yopP,yopE, andyopMpolymutants) were unable to block the TNF-α response of the macrophages. In contrast, singleyopE,yopH,yopO, andyopMmutants behaved like the wild-type strain. AyopPmutant elicited elevated TNF-α release, and complementation of theyopPmutant or theyopeffector polymutant strain withyopPalone led to a drop in TNF-α release. In addition, YopP was also responsible for the inhibition of the extracellular signal-regulated kinase2 (ERK2) and p38 MAPK activities. These results show that YopP is the Yop effector responsible for theYersinia-induced suppression of TNF-α release by infected macrophages.

Bibliography

Boland, A., & Cornelis, G. R. (1998). Role of YopP in Suppression of Tumor Necrosis Factor Alpha Release by Macrophages duringYersiniaInfection. Infection and Immunity, 66(5), 1878–1884.

Authors 2
  1. Anne Boland (first)
  2. Guy R. Cornelis (additional)
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Dates
Type When
Created 5 years, 8 months ago (Dec. 31, 2019, 10:25 a.m.)
Deposited 1 year, 11 months ago (Sept. 24, 2023, 10:35 a.m.)
Indexed 2 months ago (June 30, 2025, 1:06 a.m.)
Issued 27 years, 4 months ago (May 1, 1998)
Published 27 years, 4 months ago (May 1, 1998)
Published Print 27 years, 4 months ago (May 1, 1998)
Funders 0

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@article{Boland_1998, title={Role of YopP in Suppression of Tumor Necrosis Factor Alpha Release by Macrophages duringYersiniaInfection}, volume={66}, ISSN={1098-5522}, url={http://dx.doi.org/10.1128/iai.66.5.1878-1884.1998}, DOI={10.1128/iai.66.5.1878-1884.1998}, number={5}, journal={Infection and Immunity}, publisher={American Society for Microbiology}, author={Boland, Anne and Cornelis, Guy R.}, year={1998}, month=may, pages={1878–1884} }