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Infection and Immunity, February 1999, p. 976-980, Vol. 67, No. 2
Department of Microbiology and Molecular
Genetics and Shipley Institute of Medicine, Harvard Medical School,
Boston, Massachusetts 02115
Received 24 August 1998/Returned for modification 27 October
1998/Accepted 9 November 1998
The toxin-coregulated pilus (TCP) of Vibrio cholerae is
essential for colonization. It was recently reported that
rfb mutations in V. cholerae 569B cause the
translocation arrest of the structural subunit of TCP, raising the
possibility that the colonization defects of lipopolysaccharide mutants
are due to effects on TCP biogenesis. However, an rfbB gene
disruption in either V. cholerae O395 or 569B has no
apparent effect on surface TCP production as assessed by immunoelectron
microscopy and CTX phage transduction, and an
rfbD::Tn5lac mutant of O395 also
shows no defect in TCP expression. We conclude that the colonization
defect associated with rfb mutations is unrelated to
defects in TCP assembly.
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
rfb Mutations in Vibrio
cholerae Do Not Affect Surface Production of Toxin-Coregulated
Pili but Still Inhibit Intestinal Colonization
*
Corresponding author. Mailing address: Department of
Microbiology and Molecular Genetics and Shipley Institute of Medicine, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115. Phone: (617) 432-0767. Fax: (617) 738-7664. E-mail:
jmekalan{at}warren.med.harvard.edu.
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