Histidine-tailed microperoxidase-10: A pH-dependent ligand switch

The electronic absorption and magnetic circular dichroism (MCD) spectra of ferric histidine-tailed microperoxidase-10 (His-MP10) change dramatically a s the pH is raised from 1.8 to 11.8; Two distinct species are observed (pK( a) = 4.4). The spectra of acidic ferric His-MP10 nearly match those of ferr ic meso-porphyrin-reconstituted myoglobin and so the axial ligands are assi gned to be histidine and water. The retention of histidine ligation below p H 4 contrasts to the behavior of myoglobin and horseradish peroxidase which convert to five-coordinate water ligated and then lose the heme prosthetic group at even lower pH. Neutral and alkaline ferric His-MP10 have spectra that are very similar to those of the imidazole complex of ferric mesoporph yrin-reconstituted myoglobin. Thus, we conclude that it is bis-histidine li gated with the C-terminal histidine bound as the sixth ligand. Thus, ferric His-MP10 exhibits a pH-dependent ligand switch with a change in axial liga tion from water and histidine at low pH to bis-histidine at neutral and alk aline pH. (C) 1998 Academic Press.