Abstract

1. 1. l-2-HAOX A and l-2-HAOX B were purified from chicken and rat kidney with purification factors of 550 and 45, respectively. 2. 2. It was established that both enzymes were tetrameric ( M r = 169,000) and consisted of 40 kDa monomers. 3. 3. While chicken kidney l-2-HAOX A is N-terminally blocked like spinach glycolate oxidase and chicken liver l-2-HAOX A, l-2-HAOX B begins with a Pro residue. 4. 4. The kinetic parameters of l-HMB oxidation by l-2-HAOX A and B were determined. 5. 5. The results are particularly interesting as regards l-HMB oxidation by l-2-HAOX B.

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