Abstract
This study shows that the Vibrio cholerae RTX toxin is secreted by a four-component type I secretion system (TISS) encoded by rtxB, rtxD, rtxE, and tolC. ATP-binding site mutations in both RtxB and RtxE blocked secretion, demonstrating that this atypical TISS requires two transport ATPases that may function as a heterodimer.
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