Chloroperoxidase compound I: Electron paramagnetic resonance and Mössbauer studies.

The green primary compound of chloroperoxidase was prepared by freeze-quenching the enzyme after rapid mixing with a 5-fold excess of peracetic acid. The electron paramagnetic resonance (EPR) spectra of these preparations consisted of at least three distinct signals that could be assigned to native enzyme, a free radical, and the green compound I as reported earlier. The absorption spectrum of compound I was obtained through subtraction of EPR signals measured under passage conditions.

Paraproteinaemia in erythema elevatum diutinum.

Paraproteinaemia (IgGkappa) was observed in a 68 year-old patient with erythema elevatum diutinum. The association of this skin disease with paraproteinaemia as already reported by other authors may indicate a pathogenetic relationship.