Residues in the distal heme pocket of neuroglobin. Implications for the multiple ligand binding steps.

Abstract excerpt

Amino acid residues in the ligand binding pocket of human neuroglobin have been identified by site-directed mutagenesis and their properties investigated by resonance Raman and flash photolysis methods. Wild-type neuroglobin has been shown to have six-coordinate heme in both ferric and ferrous states. Substitution of His96 by alanine leads to complete loss of heme, indicating that His96 is the proximal ligand....

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