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Research Article

Characterization of CS4 and CS6 antigenic components of PCF8775, a putative colonization factor complex from enterotoxigenic Escherichia coli E8775.

M K Wolf, G P Andrews, B D Tall, M M McConnell, M M Levine, E C Boedeker
M K Wolf
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G P Andrews
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B D Tall
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M M McConnell
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M M Levine
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E C Boedeker
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ABSTRACT

PCF8775 is a putative colonization factor complex present on the surface of 10 to 20% of enterotoxigenic Escherichia coli strains and has been reported to be composed of antigen CS6 (morphology undefined) expressed alone or together with either of the rigid fimbrial antigens CS4 and CS5. To better define the individual components of this complex and the determinants of their expression, we prepared antiserum to the PCF8775 complex as it was expressed on prototype strain E8775 and then used the antiserum to identify the subunit structure of the antigens, to study their morphology, and to detect expression of individual components of the complex after transfer of plasmids into laboratory strain HB101. CS4 was purified from strain E8775, confirmed to be fimbrial by electron microscopy, and found to be composed of a 22-kilodalton protein subunit whose N-terminal amino acid sequence (1 to 20) was similar to that of colonization factor antigen I. Transconjugants that express CS6 but not CS4 were obtained by mating prototype strain E8775 with HB101. CS6 expression was mediated by a 61-megadalton plasmid. Expression of CS6 in the transconjugants correlates with expression of a 16-kilodalton cell surface protein. The CS6 antigen was confirmed to be present on the cell surface by immunogold labeling, but its morphology was beyond the limits of resolution by electron microscopy.

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Characterization of CS4 and CS6 antigenic components of PCF8775, a putative colonization factor complex from enterotoxigenic Escherichia coli E8775.
M K Wolf, G P Andrews, B D Tall, M M McConnell, M M Levine, E C Boedeker
Infection and Immunity Jan 1989, 57 (1) 164-173; DOI:

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Characterization of CS4 and CS6 antigenic components of PCF8775, a putative colonization factor complex from enterotoxigenic Escherichia coli E8775.
M K Wolf, G P Andrews, B D Tall, M M McConnell, M M Levine, E C Boedeker
Infection and Immunity Jan 1989, 57 (1) 164-173; DOI:
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