Flagellum-independent surface migration of Vibrio cholerae and Escherichia coli.

TitleFlagellum-independent surface migration of Vibrio cholerae and Escherichia coli.
Publication TypeJournal Article
Year of Publication2001
AuthorsBrown II, Häse CC
JournalJournal of bacteriology
Volume183
Issue12
Pagination3784-90
Date Published2001 Jun
ISSN0021-9193
KeywordsAgar, Bacterial Outer Membrane Proteins, Bacterial Proteins, Cell Physiological Phenomena, Colony Count, Microbial, Culture Media, DNA-Binding Proteins, Escherichia coli, Fimbriae Proteins, Flagella, Lipopolysaccharides, Membrane Proteins, Mutation, Phenotype, Sepharose, Transcription Factors, Vibrio cholerae
Abstract

Surface translocation has been described in a large variety of microorganisms, including some gram-negative enteric bacteria. Here, we describe the novel observation of the flagellum-independent migration of Vibrio cholerae and Escherichia coli on semisolid surfaces with remarkable speeds. Important aspects of this motility are the form of inoculation, the medium composition, and the use of agarose rather than agar. Mutations in several known regulatory or surface structure proteins, such as ToxR, ToxT, TCP, and PilA, did not affect migration, whereas a defect in lipopolysaccharide biosynthesis prevented translocation. We propose that the observed surface migration is an active process, since heat, protease, or chloramphenicol treatments of the cells have strong negative effects on this phenotype. Furthermore, several V. cholerae strains strongly expressing the hemagglutinin/protease but not their isogenic hap-negative mutants, lacked the ability of surface motility, and the treatment of migrating strains with culture supernatants from hap strains but not hap-null strains prevented surface translocation.

Alternate JournalJ. Bacteriol.