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to 2.1 A resolution. At the distal side of the heme molecule, flexible aspartate residue Asp168 plays a key role in catalysis. It guides incoming hydrogen peroxide toward the heme iron and mediates proton rearrangement in the process of Compound I formation. Afterward, its side chain changes its conformation, now pointing toward the protein backbone. A transient radical on the surface-exposed residue Tyr337 is the oxidation site for bulky substrates
resonance Raman and electrochemical study. In solution, enzyme shows a heterogeneous spin population, with the six-coordinated low-spin state being the most populated. The poor catalytic activity of BsDyP is ascribed to the presence of a catalytically incompetent six-coordinated low-spin population. The spin population is sensitively dependent on the pH, temperature, and physical, i.e., solution versus crystal versus immobilized, state of the enzymes. The redox potential for the Fe2+/Fe3+ couple is -40 mV at pH 7.6, which is substantially more positive than those reported for the majority of other peroxidases
structures of native enzyme, the D171N mutant, the native enzyme complexed with cyanide, and the D171N mutant associated with cyanide, to 1.4 A, 1.42 A, 1.45 and 1.4 A resolution, respectively. Structures contain four amino acids forming the binding pocket for hydrogen peroxide, and they are remarkably conserved in this family. The structures show that OD2 of Asp171 accepts a proton from hydrogen peroxide in compound I formation, and that OD2 can swing to the appropriate position in response to the ligand for heme iron