The flagellar axial proteins are transported across the cytoplasmic membrane into the central channel of the growing flagellum via the flagellar protein export apparatus, a member of the type III secretion system (T3SS). To reveal the molecular mechanism of protein transport by the T3SS, accurate measurement of protein transport under various conditions is essential. In this chapter, we describe an in vitro method for flagellar protein transport assay using inverted membrane vesicles (IMVs) prepared from Salmonella cells. This method can easily and precisely control the condition around the T3SS and be applied to other T3SSs.
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