Mechanistic studies on the biosynthesis of 6-ketoprostaglandin F1alpha
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Updated: Aug 19, 2026

Prostaglandin Extraction and Analysis in Caenorhabditis elegans
Published on: June 25, 2013
Abstract:
The isolation, structure and biosynthesis of a novel metabolite of arachidonic acid formed during incubations of rat stomach homogenates is reported. This product was formed from unlabeled, tritium-labeled and deuterium-labeled arachidonic acid and the prostaglandin endoperoxides, G2 and H2, demonstrating its formation via the "prostaglandin endoperoxide synthetase" pathway. Its structure, 6-ketoprostaglandin F1alpha, was based on mass spectral interpretation of several derivatives (undeuterated and deuterated) and confirmed through chemical synthesis. 6-Ketoprostaglandin F1alpha is unique in being formed from a substrate of the "2" series of prostaglandins, i.e. arachidonic acid, yet belonging to the "1" series. A mechanism for its biosynthesis is proposed involving a specific cyclising enzyme which we term, 6(9)-oxycyclase.
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