Spermidine synthase
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Spermidine synthase is an enzyme (EC 2.5.1.16) that catalyzes the transfer of the propylamine group from 5'-deoxy-5'-S-(3-methylthiopropylamine)sulfonium adenosine to putrescine in the biosynthesis of spermidine. The enzyme has a molecular weight of approximately 73,000 kD and is composed of two subunits of equal size.