Deacetylcephalosporin C Formation by Cephalosporin C Acetylhydrolase Induced in a Cephalosporium acermonium Mutant

Cephalosporin C acetyl-hydrolase, which had not yet been found in Cephalosporium acremonium cultures, was partially purified from the culture fluid of the mutant No. 81 by ammonium sulfate fractionation, dialysis and DEAE-cellulose column chromatography. The optimum pH and temperature of the enzyme reaction were found to be about 8.0 and 50°C, respectively. The enzyme activity was hardly affected by Mg²⁺, Mn²⁺, Zn²⁺, Co²⁺, Ni²⁺, Na⁺, K⁺, EDTA, PCMB and 2,4-dinitrophenol, but markedly inhibited by diisopropylfluoro-phosphate at 1 mm. The product formed from cephalosporin C by the enzyme reaction was proved to be deacetylcephalosporin C by physical and chemical analyses and chromatographic behaviors.