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The collagenase from Clostridium histolyticum (EC 3.4.24.3) degrades type IV collagen with Km 32 nM, indicating a high affinity for this substrate. Ferrous and ferric ions can inhibit Clostridium collagenase. Inhibition by Fe++ was of the mixed, non-competitive type, with Ki 90 microM. The inhibitory effect of Fe++ may be due to Zn++ displacement from the intrinsic functional center of this metalloprotease, since in the presence of excess amounts of Zn++ enzyme activity is retained. This inhibitory effect of Fe++ may be common for all types of collagenases, since this ion can also inhibit type IV collagenase purified from Walker 256 carcinoma, with IC50 80 microM. Cu++ can only partially inhibit Clostridium collagenase, while other divalent metal ions such as Cd++, Co++, Hg++, Mg++, Ni++ or Zn++ are devoid of any inhibitory effect on the enzyme.
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