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The virulence and i...
The virulence and infectivity of Listeria monocytogenes are not substantially altered by elevated SigB activity
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- de Oliveira, Ana H., 1995- (författare)
- Umeå universitet,Molekylär Infektionsmedicin, Sverige (MIMS),Umeå Centre for Microbial Research (UCMR),Institutionen för molekylärbiologi (Medicinska fakulteten)
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- Tiensuu, Teresa (författare)
- Umeå universitet,Molekylär Infektionsmedicin, Sverige (MIMS),Umeå Centre for Microbial Research (UCMR),Institutionen för molekylärbiologi (Medicinska fakulteten)
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- Guerreiro, Duarte (författare)
- Umeå universitet,Molekylär Infektionsmedicin, Sverige (MIMS),Umeå Centre for Microbial Research (UCMR),Institutionen för molekylärbiologi (Medicinska fakulteten),Bacterial Stress Response Group, Microbiology, School of Biological and Chemical Sciences, University of Galway, Galway, Ireland
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- Tükenmez, Hasan, 1987- (författare)
- Umeå universitet,Molekylär Infektionsmedicin, Sverige (MIMS),Umeå Centre for Microbial Research (UCMR),Kemiska institutionen,Institutionen för molekylärbiologi (Medicinska fakulteten),Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet)
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- Dessaux, Charlotte (författare)
- Laboratory of Intracellular Bacterial Pathogens, National Center of Biotechnology (CNB)-CSIC, Madrid, Spain
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- García-Del Portillo, Francisco (författare)
- Laboratory of Intracellular Bacterial Pathogens, National Center of Biotechnology (CNB)-CSIC, Madrid, Spain
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- O'Byrne, Conor (författare)
- Bacterial Stress Response Group, Microbiology, School of Biological and Chemical Sciences, University of Galway, Galway, Ireland
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- Johansson, Jörgen (författare)
- Umeå universitet,Molekylär Infektionsmedicin, Sverige (MIMS),Umeå Centre for Microbial Research (UCMR),Institutionen för molekylärbiologi (Medicinska fakulteten)
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(creator_code:org_t)
- American Society for Microbiology, 2023
- 2023
- Engelska.
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Ingår i: Infection and Immunity. - : American Society for Microbiology. - 0019-9567 .- 1098-5522. ; 91:6
- Relaterad länk:
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https://doi.org/10.1...
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https://umu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Listeria monocytogenes is a bacterial pathogen capable of causing severe infections but also thriving outside the host. To respond to different stress conditions, L. monocytogenes mainly utilizes the general stress response regulon, which largely is controlled by the alternative sigma factor Sigma B (SigB). In addition, SigB is important for virulence gene expression and infectivity. Upon encountering stress, a large multicomponent protein complex known as the stressosome becomes activated, ultimately leading to SigB activation. RsbX is a protein needed to reset a "stressed"stressosome and prevent unnecessary SigB activation in nonstressed conditions. Consequently, absence of RsbX leads to constitutive activation of SigB even without prevailing stress stimulus. To further examine the involvement of SigB in the virulence of this pathogen, we investigated whether a strain with constitutively active SigB would be affected in virulence factor expression and/or infectivity in cultured cells and in a chicken embryo infection model. Our results suggest that increased SigB activity does not substantially alter virulence gene expression compared with the wild-type (WT) strain at transcript and protein levels. Bacteria lacking RsbX were taken up by phagocytic and nonphagocytic cells at a similar frequency to WT bacteria, both in stressed and nonstressed conditions. Finally, the absence of RsbX only marginally affected the ability of bacteria to infect chicken embryos. Our results suggest only a minor role of RsbX in controlling virulence factor expression and infectivity under these conditions.
Ämnesord
- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
Nyckelord
- Listeria monocytogenes
- RsbX
- SigB
- stress response
- virulence regulation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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