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. Author manuscript; available in PMC: 2009 Dec 31.
Published in final edited form as: J Am Chem Soc. 2008 Dec 31;130(52):17801–17811. doi: 10.1021/ja8054035

Figure 1.

Figure 1

Figure 1

Ferritin protein shell with views down the (A) 4-fold, (B) 3-fold and (C) 2-fold “and (D) 1-fold” axes (channels) of the protein shell. The full protein shell is shown on the left with the rotation symmetry related subunits indicated in blue. An expanded view of each type of channel is shown on the right with key residues indicated. The “1-fold” rotation axis is a C1 axis (rotation through 360°). There are an infinite number of such axes in the protein but the one shown lies along a narrow channel leading to Fe (yellow) in the A site of the ferroxidase center (See Fig. 2) and thus has special significance.9, 36, 37 Tyr29 extends into the exterior solution.