Abstract
Propionyl-CoA carboxylase (EC 6.4.1.3) has been purified from Mycobacterium smegmatis. It has a molecular weight of about 500,000. On sodium dodecyl sulfate gels it dissociates into two subunits with molecular weights of 64,000 and 57,000. There are 3.8 mol of biotin/500,000 g of protein. The biotin is associated entirely with the heavier subunit. The enzyme also used acetyl-CoA as a substrate. No other acetyl-CoA carboxylase could be detected in this organism.
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