Elucidation of the Concise Biosynthetic Pathway of the Communesin Indole Alkaloids†
H-C.L. is supported by the National Science Council of Taiwan (102-2917-I-564-008), and G.C. was supported by a NSF Graduate Research Fellowship (DGE-0707424). This research was supported by NIH grants 1DP1GM106413 and 1R56AI101141. We thank Prof. Brian Stoltz for the gift of aurantioclavine. NMR instrumentation is supported by the NSF (CHE-1048804) and the NCRR (S10RR025631).
Abstract
The communesins are a prominent class of indole alkaloids isolated from Penicillium species. Owing to their daunting structural framework and potential as pharmaceuticals, communesins have inspired numerous synthetic studies. However, the genetic and biochemical basis of communesin biosynthesis has remained unexplored. Herein, we report the identification and characterization of the communesin (cns) biosynthetic gene cluster from Penicillium expansum. We confirmed that communesin is biosynthesized by the coupling of tryptamine and aurantioclavine, two building blocks derived from L-tryptophan. The postmodification steps were mapped by targeted-gene-deletion experiments and the structural elucidation of intermediates and new analogues. Our studies set the stage for the biochemical characterization of communesin biosynthesis. This knowledge will aid our understanding of how nature generates remarkable structural complexity from simple precursors.