ArticlebioRxiv : the preprint server for biology2026
Active removal of inhibitory components drives the flagellar Type III Secretion Specificity Switch.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Type III secretion (T3S) systems assemble bacterial nanomachines, including the flagellum and virulence-associated injectisomes, by exporting distinct classes of substrates in a defined temporal order. In both systems, completion of an early assembly intermediate triggers an irreversible switch from early to late substrate secretion. In the flagellar system, this switch is controlled by the secreted molecular ruler FliK acting on the core T3S component FlhB, but the molecular mechanism governing this transition has remained unclear. Here we show that removal of two components, Fluke and the cleaved C-terminal domain of FlhB (FlhB
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