1887

Abstract

A peroxidase from was purified to homogeneity. The enzyme ( 175000) was composed of two subunits of equal size, and showed a Soret band at 406 nm. On reduction with sodium dithionite, absorption at 434 nm and 558 nm was observed. The spectrum of reduced pyridine haemochrome showed peaks at 418, 526 and 557 nm; the reduced oxidized spectrum of pyridine haemochrome showed peaks of 418, 524 and 556 nm with a trough at 452 nm. These results indicate that the enzyme contained protohaem IX as a prosthetic group. The optimum pH was about 6 and the apparent optimum temperature was 70 °C. The enzyme was relatively stable up to 70 °C; at 30 °C it was stable for a month. The enzyme had peroxidase activity toward a mixture of 2,4-dichlorophenol and 4-aminoantipyrine with a for HO of 1·3 m. It also acted as a catalase with a for HO of 7·5 m.

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1988-07-01
2021-05-12
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