The interplay between a multifunctional dehydratase domain and a C-methyltransferase effects olefin shift in ambruticin biosynthesis was written by Berkhan, Gesche;Merten, Christian;Holec, Claudia;Hahn, Frank. And the article was included in Angewandte Chemie, International Edition in 2016.Quality Control of 1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)propan-1-one This article mentions the following:
The olefin shift is an important modification during polyketide biosynthesis. Particularly for type I cis-AT PKS, little information has been gained on the enzymic mechanisms involved. We present our in vitro investigations on the olefin shift occurring during ambruticin biosynthesis. The unique, multifunctional domain AmbDH4 catalyzes consecutive dehydration, epimerization, and enoyl isomerization. The resulting 3-enethioate is removed from the equilibrium by α-methylation catalyzed by the highly specific C-methyltransferase AmbM. This thermodynamically unfavorable overall process is enabled by the high, concerted substrate specificity of the involved enzymes. AmbDH4 shows close relationship to DH domains and initial mechanistic studies suggest that the olefin shift occurs via a similar proton-shuttling mechanism as previously described for EI domains from trans-AT-PKS. In the experiment, the researchers used many compounds, for example, 1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)propan-1-one (cas: 128947-19-3Quality Control of 1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)propan-1-one).
1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)propan-1-one (cas: 128947-19-3) belongs to isothiazole derivatives. Isothiazoles and benzisothiazoles are usually liquids or low-melting-point solids; polar substituents increase the melting points because of the possibility of hydrogen bonding and other interactions in the crystalline state. In general, isothiazole undergoes nitration in the presence of HNO3, sulfuric acid, and sulfonation by using sulfuric acid under thermal conditions to generate corresponding 4-nitro- and 4-sulfonic acid derivatives, respectively.Quality Control of 1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)propan-1-one
Referemce:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com