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Aminopropyltransferase, Spermidine

An enzyme that catalyzes the Transfer of the propylamine moiety from 5'-deoxy-5'-S-(3-methylthiopropylamine)sulfonium Adenosine to Spermidine in the biosynthesis of Spermine. It has an acidic Isoelectric Point at pH 5.0. EC 2.5.1.22.