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Gene Review

sipB  -  cell invasion protein SipB

Salmonella enterica subsp. enterica serovar Typhimurium str. LT2

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Disease relevance of sipB

  • In this study, we demonstrate that the bacterial pathogen Salmonella enterica serovar Typhimurium can efficiently kill these professional phagocytes via a mechanism that is dependent on sipB and the Salmonella pathogenicity island 1-encoded type III protein secretion system [1].

High impact information on sipB

  • In contrast, the sipB mutant did not induce such cell death or the release of active IL-18 [2].
  • We demonstrate that activation and release of IL-18 are blocked by mutations in the Salmonella sipB gene, which encodes a virulence factor that activates caspase-1 to induce apoptosis [3].
  • Salmonella enterica serovar typhimurium induces cell death in bovine monocyte-derived macrophages by early sipB-dependent and delayed sipB-independent mechanisms [4].
  • The genes encoding these proteins are located at centisome 63 on the S. typhimurium chromosome, immediately downstream of the previously identified sipB and sipC genes (K. Kaniga, S. Tucker, D. Trollinger, and J. E. Galán, J. Bacteriol. 177:3965-3971, 1995) [5].
  • The sipB mutant strain was significantly impaired to invade the intestinal, but not the tonsillar tissue, one day after inoculation and was unable to efficiently colonize the intestines and the GALT, but not the tonsils, 3 days after inoculation [6].

Biological context of sipB

  • Macrophages infected with stationary-phase cultures or with a mutant lacking sipB underwent no immediate cell death but did develop delayed cytotoxicity, undergoing cell death between 12 and 18 h postinfection [4].

Anatomical context of sipB

  • Nonpolar mutations in sicA, sipB, and sipC rendered S. typhimurium unable to enter cultured epithelial cells, indicating that these genes are required for bacterial internalization [7].

Other interactions of sipB

  • It was the aim of the present study to characterize the interactions of a porcine Salmonella Typhimurium field strain and its isogenic mutants in the SPI-1 genes hilA, sipA and sipB with porcine macrophages [8].


  1. Salmonella rapidly kill dendritic cells via a caspase-1-dependent mechanism. van der Velden, A.W., Velasquez, M., Starnbach, M.N. J. Immunol. (2003) [Pubmed]
  2. Human alveolar macrophages infected by virulent bacteria expressing SipB are a major source of active interleukin-18. Obregon, C., Dreher, D., Kok, M., Cochand, L., Kiama, G.S., Nicod, L.P. Infect. Immun. (2003) [Pubmed]
  3. Salmonella virulence factor SipB induces activation and release of IL-18 in human dendritic cells. Dreher, D., Kok, M., Obregon, C., Kiama, S.G., Gehr, P., Nicod, L.P. J. Leukoc. Biol. (2002) [Pubmed]
  4. Salmonella enterica serovar typhimurium induces cell death in bovine monocyte-derived macrophages by early sipB-dependent and delayed sipB-independent mechanisms. Santos, R.L., Tsolis, R.M., Bäumler, A.J., Smith, R., Adams, L.G. Infect. Immun. (2001) [Pubmed]
  5. Identification of two targets of the type III protein secretion system encoded by the inv and spa loci of Salmonella typhimurium that have homology to the Shigella IpaD and IpaA proteins. Kaniga, K., Trollinger, D., Galán, J.E. J. Bacteriol. (1995) [Pubmed]
  6. Salmonella Typhimurium SPI-1 genes promote intestinal but not tonsillar colonization in pigs. Boyen, F., Pasmans, F., Van Immerseel, F., Morgan, E., Adriaensen, C., Hernalsteens, J.P., Decostere, A., Ducatelle, R., Haesebrouck, F. Microbes Infect. (2006) [Pubmed]
  7. Homologs of the Shigella IpaB and IpaC invasins are required for Salmonella typhimurium entry into cultured epithelial cells. Kaniga, K., Tucker, S., Trollinger, D., Galán, J.E. J. Bacteriol. (1995) [Pubmed]
  8. Role of SPI-1 in the interactions of Salmonella Typhimurium with porcine macrophages. Boyen, F., Pasmans, F., Donné, E., Van Immerseel, F., Adriaensen, C., Hernalsteens, J.P., Ducatelle, R., Haesebrouck, F. Vet. Microbiol. (2006) [Pubmed]
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