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FEMS Microbiol Lett. 1997 Mar 1;148(1):35-42.

The CS6 colonization factor of human enterotoxigenic Escherichia coli contains two heterologous major subunits.

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Department of Gastroenterology, Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA.


The genes encoding the CS6 colonization factor were cloned from two human enterotoxigenic Escherichia coli strains of different serotypes. The DNA sequences from both clones were nearly identical and contained four open reading frames. Two of them have homology to genes encoding molecular chaperones and ushers found in many other operons encoding colonization factors. The two remaining open reading frames encode two heterologous major subunit proteins which makes CS6 unique because other colonization factors have only one major subunit. Upstream and downstream of the CS6 operon the DNA sequences of the clones diverged abruptly.

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