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. Author manuscript; available in PMC: 2016 Mar 3.
Published in final edited form as: Biochemistry. 2015 Feb 17;54(8):1611–1627. doi: 10.1021/bi501255r

Figure 4.

Figure 4

View of a 3-fold pore in wt BfrB and mutants. The top row shows cross sectional views of the 3-fold pores in the as-isolated structures. The middle row depicts an identical cross-section view of the 3-fold pores in the Fe-soaked structures, with Fe3f iron ions rendered as orange spheres, sulfate ions as green (S) and red (O) spheres, and structured water as yellow spheres. The bottom row depicts the 3-fold pores viewed from the interior cavity, to illustrate the network of interactions involving iron, sulfate and protein side chains.