Sym-norspermidine synthase

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In enzymology, a sym-norspermidine synthase (EC is an enzyme that catalyzes the chemical reaction

S-adenosylmethioninamine + propane-1,3-diamine 5'-methylthioadenosine + bis(3-aminopropyl)amine

Thus, the two substrates of this enzyme are S-adenosylmethioninamine and propane-1,3-diamine, whereas its two products are 5'-methylthioadenosine and bis(3-aminopropyl)amine.

This enzyme belongs to the family of transferases, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is S-adenosylmethioninamine:propane-1,3-diamine 3-aminopropyltransferase. This enzyme participates in urea cycle and metabolism of amino groups.


  • IUBMB entry for
  • BRENDA references for (Recommended.)
  • PubMed references for
  • PubMed Central references for
  • Google Scholar references for
  • Aleksijevic A, Grove J, Schuber F (1979). "Studies on polyamine biosynthesis in Euglena gracilis". Biochim. Biophys. Acta. 565: 199&ndash, 207. PMID 116684.
  • Villanueva VR, Adlakha RC and Calbayrac R (1980). "Biosynthesis of polyamines in Euglena gracilis". Phytochemistry. 19: 787&ndash, 790.

External links

Gene Ontology (GO) codes