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- W2138702981 abstract "Of several commercial media tested, trypticase soya both containing 0.4% (w/v) D-sorbitol was superior as a growth medium for the production of extracellular proteinase by Propionibacterium acnes (strain P-37). Extracellular proteinase, production of which was shown to be growth-associated by both batch and continuous culture studies, was partially purified by 70% (NH4)2SO4 saturation. Sephadex G-75 chromatography and ion exchange on DEAE-Sephadex A-50. It was shown to be a heterogeneous mixture of at least three molecular species of enzyme. Proteinase I was inhibited by EDTA (10(-3) mol/l) and PMSF (5 millimol/l) and stimulated by CaCl2 (190% at 10(-3) mol/l). It had a molecular weight of 20 to 30000 and a broad pH optimum from 6.5 to 7.5. Proteinase II was an alkaline proteinase with a molecular weight of 30 to 40000 which was not significantly inhibited by EDTA (10(-2) mol/l) nor stimulated by CaCl2. Proteinase III represented a minor proportion of the recovered proteolytic activity, had a molecular weight of 20 to 30000 and was most active in the alkaline pH range. This enzyme was inhibited by EDTA (10(-4) mol/l) and PMSF (5 millimol/l), and stimulated by CaCl2 (250% at 10(-2) mol/l)." @default.
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- W2138702981 date "1983-04-01" @default.
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- W2138702981 title "Studies of the extracellular proteolytic activity produced by<i>Propionibacterium acnes</i>" @default.
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- W2138702981 doi "https://doi.org/10.1111/j.1365-2672.1983.tb02616.x" @default.
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