Buggs: TSS and the Flagellum

[Krauze]

@Rumraket

More importantly is that the proposal is not that the extant flagellum derived from the extant T3SS, but that an ancestral state in the evolution of the flagellum was similar to and had a function similar to the T3SS. It is to be expected that both the flagellum and the injectisome have further specialized and diverged from their common ancestral systems.

Richard Buggs isn’t saying anything about extant structures deriving from each other. He’s referencing Abby & Rocha (2012) showing that the injectisome (aka. the non-flagellar type III secretion system) evolved from a flagellum, not the other way around:

The Non-Flagellar Type III Secretion System Evolved from the Bacterial...