Polyamine aminopropyltransferase

UniProtKB accession:  Q8U4G1

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UniProtKB description:  Involved in the biosynthesis of polyamines which are thought to support the growth of thermophilic microorganisms under high-temperature conditions. It seems that long-chain and branched-chain of polyamines effectively stabilize DNA and RNA, respectively. Catalyzes the irreversible transfer of a propylamine group from the amino donor S-adenosylmethioninamine (decarboxy-AdoMet) to various amine acceptors such as agmatine, cadaverine (1,5-diaminopentane), putrescine (1,4-diaminobutane) and 1,3-diaminopropane. The biosynthesis of norspermine and thermospermine from sym-norspermidine and spermidine has been also observed, but with a very low activity. The reaction involves a nucleophilic attack on the C-3 methylene of the propylamine moiety adjacent to the positively charged sulfur of decarboxy-AdoMet.