Send to

Choose Destination
Microbiology. 2006 Jul;152(Pt 7):2101-2110. doi: 10.1099/mic.0.28607-0.

Antigen-43-mediated autoaggregation impairs motility in Escherichia coli.

Author information

School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Queensland 4072, Australia.
Centre for Microscopy and Microanalysis, University of Queensland, Brisbane, Queensland 4072, Australia.

Erratum in

  • Microbiology. 2006 Sep;152(Pt 9):2865.


Functional interaction between bacterial surface-displayed autoaggregation proteins such as antigen 43 (Ag43) of Escherichia coli and motility organelles such as flagella has not previously been described. Here, it has been demonstrated for the first time that Ag43-mediated aggregation can inhibit bacterial motility. Ag43 overexpression produces a dominant aggregation phenotype that overrides motility in the presence of low levels of flagella. In contrast, induction of an increased flagellation state prevents Ag43-mediated aggregation. This phenomenon was observed in naturally occurring subpopulations of E. coli as phase variants expressing and not expressing Ag43 revealed contrasting motility phenotypes. The effects were shown to be part of a general mechanism because other short adhesins capable of mediating autoaggregation (AIDA-I and TibA) also impaired motility. These novel insights into the function of bacterial autoaggregation proteins suggest that a balance between these two systems, i.e. autoaggregation and flagellation, influences motility.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Ingenta plc
Loading ...
Support Center