Abstract
1. After selective binding of [ 3H]pargyline to either monoamine oxidase (MAO) A or MAO B in the rat liver, MAO B alone in the rat brain and MAO in carp brain and liver, molecular weight and isoelectric points (pI) of these MAO were determined by sodium dodecyi sulphate (SDS)-polyacrylamide gel electrophoresis and isoelectric focusing and results obtained were compared. 2. For all tissues tested, SDS-polyacrylamide gel electrophoresis of [ 3H]pargyline-bound samples revealed a labelled protein band of an apparent mol. wt of 60,000 da. 3. Estimation of radioactivity of [ 3H]pargyline bound after isoelectric focusing revealed a single protein band with acidic pi values of about 5.5 for rat brain and liver MAO B. 4. Moreover, the pi values of about 7.5 were obtained for carp brain and liver MAO. This basic value was also found for MAO A in the rat liver MAO A.
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