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. Author manuscript; available in PMC: 2009 Oct 12.
Published in final edited form as: Semin Cell Dev Biol. 2008 Nov 19;20(2):240–250. doi: 10.1016/j.semcdb.2008.11.006

Fig. 7.

Fig. 7

The membrane topology models for RseP, SpoIVFB and S2P (substrates shown in blue). The arrow head points at the cleavage site; the arrow indicates the direction of the polypeptide; the metal binding motifs are shown in red. The conserved three TM domains (a–c) are represented by white boxes. An 8-TM model of S2P is shown here (see text). Note that the figure is not in scale; the various “loops” that connect the TM domains may fold into α-helices (or even continuous with the TM helix) or β-strands in the real structure.