Structural analysis of the two horseradish peroxidase catalytic residue variants H42E and R38S/H42E: implications for the catalytic cycle

The crystal structures of two mutants of horseradish peroxidase C (HRPC) with substitutions of the key catalytic residues Arg83 and His42 have been determined to 2.5 Å (H42E HRPC) and 2.0 Å (R38S/H42E HRPC) resolution.