Mechanistic Characterization of Two Chimeric Sesterterpene Synthases from<i>Penicillium</i>
作者:Takaaki Mitsuhashi、Jan Rinkel、Masahiro Okada、Ikuro Abe、Jeroen S. Dickschat
DOI:10.1002/chem.201702766
日期:2017.7.26
The products of two bifunctional fungal sesterterpenesynthases (StTPS), with prenyl transferase (PT) and terpene synthase (TPS) domains from Penicillium, were structurally characterized and their mechanisms studied in detail by labeling experiments. A phylogenetic analysis of the TPS domains of the new and previously characterized enzymes revealed six distinct clades. Enzymes from the same clade catalyze
Cyclization mechanism of phomopsene synthase: mass spectrometry based analysis of various site-specifically labeled terpenes
作者:Sandip S Shinde、Atsushi Minami、Zhi Chen、Tetsuo Tokiwano、Tomonobu Toyomasu、Nobuo Kato、Takeshi Sassa、Hideaki Oikawa
DOI:10.1038/ja.2017.27
日期:2017.5
examined the cyclization mechanism of tetracyclicditerpene phomopsene with phomopsene synthase. A detailed EI-MS analysis of phomopsene labeled at various positions allowed us to propose the structures corresponding to the most intense peaks, and thus elucidate a cyclization mechanism involving double 1,2-alkyl shifts and a 1,2-hydride shift via a dolabelladien-15-yl cation. Our study demonstrated that