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. Author manuscript; available in PMC: 2015 Feb 5.
Published in final edited form as: Curr Opin Cell Biol. 2014 Jan 16;26:132–138. doi: 10.1016/j.ceb.2013.12.007

Figure 2.

Figure 2

A) Electron cryotomography images of wild-type Caulobacter crescentus cells containing stalk diffusion barriers (* and inset). ΔstpAB cells lack these structures. White arrows indicate unidentified structures that span the interior of the stalk (SL= S layer, OM= outer membrane, PG= peptidoglycan, IM= inner membrane, C= cytoplasm). Scale bar 100 nm. Reprinted from [Schlimpert et al., Cell, 2011] with permission from Elsevier. B) Stalk diffusion barriers: Comprising a protein complex of StpA, StpB, StpC and StpD (blue circles), diffusion barriers limit soluble and membrane protein diffusion into the stalk of C. crescentus.