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. Author manuscript; available in PMC: 2016 Jan 1.
Published in final edited form as: Biochim Biophys Acta. 2014 Sep 28;1847(1):98–108. doi: 10.1016/j.bbabio.2014.09.008

Fig. 13.

Fig. 13

Comparison of the H-bonding interactions between R474 and the D-ring propionate group of heme a in P. denitrificans CcO at pH 8.0 (PDB: 1QLE) and pH 5.5 (PDB: 3HB3) and the equivalent interactions involving R439 in bovine CcO (PDB: 3ABL).