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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Future Microbiol. 2010 Sep;5(9):1403–1412. doi: 10.2217/fmb.10.90

Figure 1. Vibrio anguillarum and Escherichia coli TonB energy transduction systems.

Figure 1

Heme or ferric iron–siderophore complexes are shown as red circles with arrows depicting their transport through the outer membrane TonB-dependent transporters into the periplasm and eventually into the cytoplasm where the iron can be used in cell processes. (A) The V. anguillarum TonB systems 1 and 2 are depicted as a model for Vibrio TonB systems and are compared with (B) the Escherichia coli TonB system.