Multiple Host Kinases Contribute to Akt Activation during Salmonella Infection

Bernhard Roppenser, Hyunwoo Kwon, Veronica Canadien, Risheng Xu, Peter N. Devreotes, Sergio Grinstein, John H. Brumell

Research output: Contribution to journalArticle

Abstract

SopB is a type 3 secreted effector with phosphatase activity that Salmonella employs to manipulate host cellular processes, allowing the bacteria to establish their intracellular niche. One important function of SopB is activation of the pro-survival kinase Akt/protein kinase B in the infected host cell. Here, we examine the mechanism of Akt activation by SopB during Salmonella infection. We show that SopB-mediated Akt activation is only partially sensitive to PI3-kinase inhibitors LY294002 and wortmannin in HeLa cells, suggesting that Class I PI3-kinases play only a minor role in this process. However, depletion of PI(3,4) P2/PI(3-5) P3 by expression of the phosphoinositide 3-phosphatase PTEN inhibits Akt activation during Salmonella invasion. Therefore, production of PI(3,4) P2/PI(3-5) P3 appears to be a necessary event for Akt activation by SopB and suggests that non-canonical kinases mediate production of these phosphoinositides during Salmonella infection. We report that Class II PI3-kinase beta isoform, IPMK and other kinases identified from a kinase screen all contribute to Akt activation during Salmonella infection. In addition, the kinases required for SopB-mediated activation of Akt vary depending on the type of infected host cell. Together, our data suggest that Salmonella has evolved to use a single effector, SopB, to manipulate a remarkably large repertoire of host kinases to activate Akt for the purpose of optimizing bacterial replication in its host.

Original languageEnglish (US)
Article numbere71015
JournalPloS one
Volume8
Issue number8
DOIs
StatePublished - Aug 22 2013

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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    Roppenser, B., Kwon, H., Canadien, V., Xu, R., Devreotes, P. N., Grinstein, S., & Brumell, J. H. (2013). Multiple Host Kinases Contribute to Akt Activation during Salmonella Infection. PloS one, 8(8), [e71015]. https://doi.org/10.1371/journal.pone.0071015