In vitro biosynthesis of isoprene from mevalonate utilizing a rat liver cytosolic fraction

The in vitro biosynthesis of isoprene from DL-mevalonate in the cytosolic fraction of rat liver is described. Evidence is provided suggesting a non-enzymatic formation of isoprene from isopentenyl pyrophosphate and/or dimethylallyl pyrophosphate. Furthermore, the data establish an alternate fate of the mevalonate carbon skeleton providing the first evidence that breath isoprene is linked to cholesterol biosynthesis.