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. 1990 Feb;172(2):619–629. doi: 10.1128/jb.172.2.619-629.1990

Genetic analysis of an invasion region by use of a Tn3-lac transposon and identification of a second positive regulator gene, invE, for cell invasion of Shigella sonnei: significant homology of invE with ParB of plasmid P1.

H Watanabe 1, E Arakawa 1, K Ito 1, J Kato 1, A Nakamura 1
PMCID: PMC208485  PMID: 1688841

Abstract

We have previously cloned two distinct regions of the Shigella sonnei form I plasmid pSS120, a 37-kilobase-pair DNA region and a virF region, which were found to be essential for cell invasion in Escherichia coli K-12 (J. Kato, K. Ito, A. Nakamura, and H. Watanabe, Infect. Immun. 57:1391-1398, 1989). The 37-kilobase-pair DNA region was randomly inserted by use of transposon Tn3-lac. At least eight genes were found to be located within the region, as determined by analysis of Tn3-lac-generated lac fusions. Expression of six genes, ipaB, ipaC, invE, invG, invJ, and invK, was apparently regulated by the positive regulator virF. IpaB and IpaC proteins could not found in invE mutants even if the virF gene was present. This observation suggested that the invE region encoded a positive regulator different from the virF gene. The functional relationship between the invE and virF genes was then examined. Translational fusions ipaB::Tn3-lac and invJ::Tn3-lac were used as indicators for gene expression, and the following results were obtained. Full expression of the ipaB and invJ genes required the presence of both the invE and virF regions. virF positively regulated the expression of invE at the transcriptional level. An increase in the copy number of invE enhanced the expression of ipaB and invJ in the absence of virF. These findings strongly indicate that the invE gene product, whose expression is regulated by virF, acts positively on the invasion-associated genes. InvE is a 35,407-dalton protein and has significant homologies with ParB of plasmid P1 and SopB of plasmid F, which are DNA-binding proteins involved in plasmid partitioning.

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