Present address: Institut Louis Bugnard, INSERM U397, CHU Rangueil, 31054 Toulouse Cedex, France.
Deletion analysis of gene minE which encodes the topological specificity factor of cell division in Escherichia coli
Article first published online: 8 MAR 2004
Volume 18, Issue 2, pages 321–329, October 1995
How to Cite
Pichoff, S., Vollrath, B., Touriol, C. and Bouché, J.-P. (1995), Deletion analysis of gene minE which encodes the topological specificity factor of cell division in Escherichia coli. Molecular Microbiology, 18: 321–329. doi: 10.1111/j.1365-2958.1995.mmi_18020321.x
- Issue published online: 8 MAR 2004
- Article first published online: 8 MAR 2004
- Received 2 February, 1995; revised 20 June, 1995; accepted 22 June, 1995.
- Cited By
Division inhibition caused by the minCD gene products of Escherichia coli is suppressed specifically at mid-cell by MinE protein expressed at physiological levels. Excess MinE allows division to take place also at the poles, leading to a minicell-forming (Min−) phenotype. In order to investigate the basis of this topological specificity, we have analysed the ability of truncated derivatives of MinE to suppress either minCD-dependent division inhibition in a chromosomal Δ(minB) background, or the division inhibition exerted by MinCD at the cell poles in a minB,+ strain. Our results indicate that these two effects are not mediated by identical interactions of MinE protein. In addition, gel filtration and the yeast two-hybrid system indicated that MinE interacts with itself by means of its central segment. Taken together, our results favour a model in which wild-type MinE dimer molecules direct the division inhibitor molecules to the cell poles, thus preventing polar divisions and allowing non-polar sites to divide. This model explains how excess MinE, or an excess of certain MinE derivatives which prevent the accumulation of the division inhibitor at the poles, can confer a Min− phenotype in a minB+ strain.