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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1988 Dec;85(23):9317–9321. doi: 10.1073/pnas.85.23.9317

Characterization of invasion plasmid antigen genes (ipaBCD) from Shigella flexneri.

M M Venkatesan 1, J M Buysse 1, D J Kopecko 1
PMCID: PMC282730  PMID: 3057506

Abstract

The large invasion plasmid of Shigella flexneri M9OT-W was used to generate recombinant plasmids carrying the ipaA, -B, -C, and -D genes, whose products are associated with the entry of the bacteria into colonic epithelial cells. Complete DNA sequences of ipaB, -C, and -D were determined. The proteins predicted (62, 42, and 37 kDa, respectively) from the nucleotide sequences lack a signal-peptide sequence. Hydrophilic segments of the IpaB and IpaC proteins were found to overlap known epitopic domains of these membrane antigens. Analysis of total RNA demonstrated that temperature control of ipa gene expression occurs at the level of transcription. Multiple mRNA bands were detected by using ipa gene fragments as hybridization probes, and a putative transcript map for the ipa genes was constructed. Comparison of this map with the DNA sequence reveals a complex system of ipa gene regulation.

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Selected References

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