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A bromoperoxidase was purified and partially characterized from Pseudomonas pyrrocinia ATCC 15958, a bacterium that produces the antifungal antibiotic pyrrolnitrin. The purified enzyme preparation was homogeneous as determined by polyacrylamide gel electrophoresis and ultracentrifugation. The molecular mass of the enzyme was estimated to be 154 kDa +/- 3 kDa as determined by gel filtration and ultracentrifugation. Sodium dodecyl sulfate polyacrylamide gel electrophoresis showed a single band with the mobility of a 76-kDa species. Therefore, in solution at neutral pH, bromoperoxidase exists as a dimeric species. The isoelectric point was 5.0. The prosthetic group of this procaryotic bromoperoxidase was ferriprotoporphyrin IX. The spectral properties of the native and reduced enzyme are reported. The purified enzyme showed brominating as well as peroxidase and catalase activity.
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