spermine synthase activity (Q21150959)
Catalysis of the reaction: S-adenosylmethioninamine + spermidine = 5'-methylthioadenosine + spermine.
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other details
aliases GO:0016768
 spermidine aminopropyltransferase activity
 spermine synthetase activity
 S-adenosylmethioninamine:spermidine 3-aminopropyltransferase activity
description Catalysis of the reaction: S-adenosylmethioninamine + spermidine = 5'-methylthioadenosine + spermine.

External Links
(P686) GO:0016768
(P2892) C1152063