Fig. 1 (IMAGE)
Caption
The LP-ring assembly process around the rod
FlgI monomers assemble around the rod to form the P-ring, which is firmly attached to the rod surface with its slightly elliptic shape and small tilt. FlgH monomers are further translocated to the outer membrane (OM) and assemble on the P-ring to form the L-ring after the rod grows and penetrates the peptidoglycan layer (PG). The L-ring formed on the tilted elliptic P-ring clashes with the rod surface, forcing the P-ring to be oriented perpendicular to the rod axis and dissociate from the rod surface so that the LP-ring becomes a non-elliptic cylinder surrounding the free-standing rod to be a functional bushing.
Credit
Adapted from Figure 5 of "Structural insights into the assembly mechanism of the molecular bushing in the bacterial flagellar motor" by Tomoko Yamaguchi et al., 2026, Communications Biology
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