Biosynthesis of neocarazostatin A reveals the sequential carbazole prenylation and hydroxylation in the tailoring steps

Sheng Huang, Somayah Sameer Elsayed, Meinan Lv, Jioji Tabudravu, Mostafa E Rateb, Roland Gyampoh, Kwaku Kyeremeh, Rainer Ebel, Marcel Jaspars, Zixin Deng, Yi Yu, Hai Deng

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Neocarazostatin A (NZS) is a bacterial alkaloid with promising bioactivities against free radicals, featuring a tricyclic carbazole nucleus with a prenyl moiety at C-6 of the carbazole ring. Here, we report the discovery and characterization of the biosynthetic pathway of NZS through genome mining and gene inactivation. The in vitro assays characterized two enzymes: NzsA is a P450 hydroxylase and NzsG is a new phytoene-synthase-like prenyltransferase (PTase). This is the first reported native PTase that specifically acts on the carbazole nucleus. Finally, our in vitro reconstituted experiment demonstrated a coupled reaction catalyzed by NzsG and NzsA tailoring the NZS biosynthesis.
Original languageEnglish
Pages (from-to)1633-1642
Number of pages10
JournalChemistry & Biology
Issue number12
Early online date3 Dec 2015
Publication statusPublished - 17 Dec 2015



  • carbazole alkaloids
  • biosynthesis
  • prenyltransferase
  • reconstitution
  • P450 enzyme
  • neocarazostatin A

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