PMID: 207340May 11, 1978Paper

Isolation procedure and some properties of myeloperoxidase from human leucocytes

Biochimica Et Biophysica Acta
A R BakkenistB F Van Gelder


1. A rapid isolation procedure with a high yield for pure myeloperoxidase (donor:H2O2 oxidoreductase, EC from normal human leucocytes is described. The enzyme was solubilized from leucocytes with the detergent, cetyltrimethylammonium bromide, and purified to apparent homogeneity. The yield of the enzyme was 17% with an absorbance ratio A430nm/A280nm = 0.85. 2. The purified enzyme showed three isoenzyme bands after polyacrylamide gel electrophoresis; ultracentrifuge studies indicated one homogeneous band with a molecular weight of 144 000. After reduction of myeloperoxidase, sodium dodecyl sulfate gel electrophoresis resolved an intense band (63 000 daltons) and a weak band (81 000 daltons). 3. The carbohydrate content of the enzyme was at least 2.5%. Mannose, glucose and N-acetylglucosamine were present. The amino acid composition is reported. 4. The EPR spectrum exhibited a high-spin heme signal with rhombic symmetry (gx = 6.92, gy = 5.07 and gz = 1.95). Upon acidification this signal was converted into a signal with more axial symmetry (g perpendicular = 5.89). At high pH (9.5) the EPR spectrum of the enzyme only shows low-spin ferric heme resonances. The circular dichroism spectra of ferric and ferrous myeloperoxid...Continue Reading


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