1887

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Volume 158, Issue 7

Self-association of the IcsA autotransporter protein Free

Abstract

The IcsA autotransporter protein is a major virulence factor of the human intracellular pathogen . IcsA is distributed at the poles in the outer membrane (OM) of and interacts with components of the host actin-polymerization machinery to facilitate intracellular actin-based motility and subsequent cell-to-cell spreading of the bacterium. We sought to characterize the biochemical properties of IcsA in the bacterial OM. Chemical cross-linking data suggested that IcsA exists in a complex in the OM. Furthermore, reciprocal co-immunoprecipitation of differentially epitope-tagged IcsA proteins indicated that IcsA is able to self-associate. The identification of IcsA linker-insertion mutants that were negatively dominant provided genetic evidence of IcsA–IcsA interactions. From these results, we propose a model whereby IcsA self-association facilitates efficient actin-based motility.

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2012-07-01
2024-04-26
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Self-association of the Shigella flexneri IcsA autotransporter protein
Microbiology 158, 1874 (2012); https://doi.org/10.1099/mic.0.056465-0
/content/journal/micro/10.1099/mic.0.056465-0
/content/journal/micro/10.1099/mic.0.056465-0
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