Régnier P, Thang MN. Properties of a cytoplasmic proteolytic enzyme from Escherichia coli.
EUROPEAN JOURNAL OF BIOCHEMISTRY 1975;
54:445-51. [PMID:
809269 DOI:
10.1111/j.1432-1033.1975.tb04155.x]
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Abstract
A cytoplasmic protease was partially purified from Escherichia coli; its sedimentation coefficient was found to be 5.3 S. This enzyme (which we call protease A) is not a serine protease and cysteine is not required for its activity; it is only active in the presence of divalent ions which are strongly bound to it. After inactivation of protease A by incubation at 50 degrees C in the presence of 1 mM EDTA, the enzyme is reactived by Mg2+, Mn2+ or Ca2+. We have tried most of the usual esters as substrates and found that none was hydrolyzed by the enzyme which induces a highly restricted specificity.
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