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YopH of Yersinia ps...
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Andersson, K
(författare)
YopH of Yersinia pseudotuberculosis interrupts early phosphotyrosine signalling associated with phagocytosis.
- Artikel/kapitelEngelska1996
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LIBRIS-ID:oai:DiVA.org:umu-65076
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-65076URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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The PTPase YopH of Yersinia is essential to the ability of these bacteria to block phagocytosis. Wild-type Yersinia pseudotuberculosis, but not the yopH mutant strain, resisted phagocytosis by J774 cells. Ingestion of a yopH mutant was dependent on tyrosine kinase activity. Transcomplementation with wild-type yopH restored the anti-phagocytic effect, whereas introduction of the gene encoding the catalytically inactive yopHC403A was without effect. The PTPase inhibitor orthovanadate impaired the anti-phagocytic effect of the wild-type strain, further demonstrating the importance of bacteria-derived PTPase activity for this event. The ability to resist phagocytosis indicates that the effect of the bacterium is immediately exerted when it becomes associated with the phagocyte. Within 30 s after the onset of infection, wild-type Y. pseudotuberculosis caused a YopH-dependent dephosphorylation of phosphotyrosine proteins in J774 cells. Furthermore, interaction of the cells with phagocytosable strains led to a rapid and transient increase in tyrosine phosphorylation of paxillin and some other proteins, an event dependent on the presence of the bacterial surface-located protein invasin. Co-infection with the phagocytosable strain and the wild-type strain abolished the induction of tyrosine phosphorylation. Taken together, the present findings demonstrate an immediate YopH-mediated dephosphorylation of macrophage phosphotyrosine proteins, suggesting that this PTPase acts by preventing early phagocytosis-linked signalling in the phagocyte.
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Carballeira Suarez, NUmeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten),Lundgren
(författare)
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Magnusson, K E
(författare)
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Persson, C
(författare)
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Stendahl, O
(författare)
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Wolf-Watz, HUmeå universitet,Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet),Wolf-Watz(Swepub:umu)hawo0001
(författare)
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Fällman, MUmeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten),Fällman(Swepub:umu)mafa0002
(författare)
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Umeå universitetInstitutionen för molekylärbiologi (Medicinska fakulteten)
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Molecular Microbiology20:5, s. 1057-690950-382X1365-2958
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