Description
The enzyme has been originally characterized from the protist Euglena gracilis. The enzyme from the archaeon Sulfolobus solfataricus can transfer the propylamine moiety from S-adenosyl 3-(methylthio)propylamine to putrescine, sym-norspermidine and spermidine with lower efficiency. cf. EC 2.5.1.16 (spermidine synthase) and EC 2.5.1.22 (spermine synthase)