The conserved ATPase of type III secretion systems is critical to the export of substrates through the apparatus. We present a characterization of the native T3SS ATPase, Spa47, from the cytoplasm of Shigella flexneri, demonstrating it to be in two distinct high-molecular-weight complexes with Spa33: MxiN and MxiK.
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Johnson et al. (2008) studied this question.
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