A soluble methyl-accepting chemotaxis protein (MCP) of Pseudomonas aeruginosa, McpS, showed polar localization by immunofluorescence microscopy. Overexpression of McpS resulted in a dominant-negative effect on chemotaxis and caused a loss of polar clustering of the general MCP population. The polar localization of a soluble MCP defines a third, and unexpected, paradigm for cellular MCP localization.
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Bardy et al. (2005) studied this question.
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