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Transcriptional Slippage in mxiE Controls Transcription and Translation of the Downstream mxiD Gene, Which Encodes a Component of the Shigella flexneri Type III Secretion Apparatus

Unité de Pathogénie Microbienne Moléculaire, INSERM U389, Institut Pasteur, 25-28 rue du Dr Roux, 75724 Paris Cedex 15, France

Received 16 September 2005/ Accepted 10 November 2005

The Shigella flexneri transcription activator MxiE is produced by transcriptional slippage from two overlapping open reading frames. By using plasmids encoding a mxiD-lacZ translational fusion, we showed that transcriptional slippage in mxiE influences both transcription and translation of the downstream mxiD gene encoding an essential component of the type III secretion apparatus.