Elucidation of the biosynthetic origin of the ...

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Title Elucidation of the biosynthetic origin of the anti-inflammatory pseudopterosins
Author(s) Russell G. Kerr, A. C. Kohl, T. A. Ferns
Journal Journal of Industrial Microbiology & Biotechnology
Date 2006
Volume 33
Issue 7
Start page 532
End page 538
Abstract The pseudopterosins are a family of diterpene glycosides isolated from the gorgonian coral Pseudopterogorgia elisabethae. These metabolites exhibit potent anti-inflammatory activity, and this review describes our efforts to elucidate their biosynthetic origin. A radioactivity-guided isolation was used to identify the terpene cyclase product. In addition, a detailed NMR-guided search for potential biosynthetic intermediates identified metabolites which were tested by incubating 3H-labeled analogues with a cell-free extract of the coral. All labeled metabolites were generated biosynthetically, and radiochemical purity was established by a combination of HPLC purification and derivatization. In summary, pseudopterosins are produced by a cyclization of geranylgeranyl diphosphate to elisabethatriene, aromatization to erogorgiaene, two successive oxidations to 7,8-dihydroxyerogorgiaene and a glycosylation to afford a seco-pseudopterosin as a key intermediate. A dehydrogenation leads to amphilectosins which undergo ring closures to yield the pseudopterosins.
DOI 10.1007/s10295-006-0106-3

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