Catalyzes the irreversible transfer of a propylamine group from the amino donor S-adenosylmethioninamine (decarboxy-AdoMet) to putrescine (1,4-diaminobutane) to yield spermidine.

Belongs to the spermidine/spermine synthase family.

275 amino acids

MELWFTEYQTPTLGITCKTKKTLHSEKTEYQELAVIETEQFGRMLLLDGIIQTTVADEFVYHEMIAHVPLFTHKNPKKALVVGGGDGGSIREIVKHPSIEKAVLCEIDRRVIEVSKEYLPEISCALDNEKVEVVVGDGIKYVKEHKNEFDVIIIDSTDPIGPAEGLFAIDFYRAVYDCLKEDGIFVAQTESPFIDKELITRIIRDVKSLFPITRLYTCAIPTYPTGYWCFTMGSKKYDPLETDIDSIPDIDTKYYCPQIHRAAFILPKFAKELIK

31.4 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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