Biosynthesis of Neocarazostatin A Reveals the Sequential Carbazole Prenylation and Hydroxylation in the Tailoring Steps
作者: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
DOI:10.1016/j.chembiol.2015.10.012
日期:2015.12
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.
First enantioselective total synthesis of neocarazostatin B, determination of its absolute configuration and transformation into carquinostatin A
作者:Regina Czerwonka、Kethiri R. Reddy、Elke Baum、Hans-Joachim Knölker
DOI:10.1039/b515674b
日期:——
The firstenantioselective total synthesis of neocarazostatin B, the determination of its absolute configuration and transformation into carquinostatin A are described.
Transition metals in organic synthesis - Part 83#: Synthesis and pharmacological potential of carbazoles
作者:Taylor A. Choi、Regina Czerwonka、Ronny Forke、Anne Jäger、Jan Knöll、Micha P. Krahl、Tilo Krause、Kethiri R. Reddy、Scott G. Franzblau、Hans-Joachim Knölker
DOI:10.1007/s00044-007-9073-0
日期:2008.6
the first naturally occurring carbazole alkaloids with antituberculosis (anti-TB) activity, clausine K and micromeline, a study on the structure–activity relationships for anti-TB-active carbazolederivatives has been carried out. The 6-oxygenated carbazoles glycozoline and glycozolinine show antibiotic activity towards several microorganisms. The 7-oxygenated carbazole siamenol exhibits anti-HIV activity