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. Author manuscript; available in PMC: 2010 Jan 13.
Published in final edited form as: Biochemistry. 2009 Jan 13;48(1):96–109. doi: 10.1021/bi801860g

Figure 2.

Figure 2

(A) The fold of HasAp harbors four α-helices and eight anti-parallel β-strands. The axial ligands, His32 and Tyr75 are located in two extended loops above and below the heme. The side chain of His83 is located within hydrogen bonding distance of the Tyr75 phenolic acid proton. (B) Presentation of the heme and its coordination sphere in HasAp at 1.7 Å resolution depicting hydrogen bonding interactions (2.2 – 3.2 Å; black dotted lines).