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J. Bacteriol., Jul 1995, 3965-3971, Vol 177, No. 14
K Kaniga, S Tucker, D Trollinger and JE Galan
Entry into host cells is an essential feature in the pathogenicity of
Salmonella spp. The inv locus of Salmonella typhimurium encodes several
proteins which are components of a type III protein secretion system
required for these organisms to gain access to host cells. We report here
the identification of several proteins whose secretion into the culture
supernatant of S. typhimurium is dependent on the function of the
inv-encoded translocation apparatus. Nucleotide sequence analysis of the
genes encoding two of these secreted proteins, SipB and SipC, indicated
that they are homologous to the Shigella sp. invasins IpaB and IpaC,
respectively. An additional gene was identified, sicA, which encodes a
protein homologous to IpgC, a Shigella protein that serves as a molecular
chaperone for the invasins IpaB and IpaC. 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.
Copyright © 1995, American Society for Microbiology
Homologs of the Shigella IpaB and IpaC invasins are required for Salmonella typhimurium entry into cultured epithelial cells
Department of Molecular Genetics and Microbiology, School of Medicine, State University of New York at Stony Brook 11794-5222, USA.
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