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. Author manuscript; available in PMC: 2010 Nov 13.
Published in final edited form as: J Mol Biol. 2009 Sep 9;393(5):1129–1142. doi: 10.1016/j.jmb.2009.09.004

Figure 1.

Figure 1

Membrane-plane and extracellular views of the Ca2+/CN-Cbl-bound structure of BtuB. The barrel and luminal domains are colored in grey, the two Ca2+ ions are in blue, and CN-Cbl is shown in a stick representation colored by atom type. The eleven extracellular loops are drawn using a thicker representation and labeled using different colors to distinguish them from their neighbors.