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The Journal of Medical Microbiology, Vol 40, Issue 4 236-240, Copyright © 1994 by Society for General Microbiology

JOURNAL ARTICLE

The effect of iron on the invasiveness of Escherichia coli carrying the inv gene of Yersinia pseudotuberculosis

M. P. Conte, C. Longhi, V. Buonfiglio, M. Polidoro, L. Seganti and P. Valenti
Institute of Microbiology, University of Rome La Sapienza, Italy.

The effect of growth in iron-excess or iron-limitation conditions on the invasiveness for HeLa cells of Escherichia coli HB101 carrying plasmid pRI203 which bears the invasion gene of Yersinia pseudotuberculosis was examined. Iron-limitation reduced adhesion and the number of organisms internalised by HeLa cells by about 100-fold. The reduced adhesion of iron-starved bacteria correlated with reduced hydrophobicity and the reduced invasiveness appeared to depend on the plasmid copy number, which was 3.5-fold less than in bacteria grown in iron excess.


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