Abstract
Rhododendron dauricum L., a flowering tree popular in Hokkaido, produces daurichromenic acid (DCA), a terpenophenol with a potent anti-HIV activity. The DCA-producing enzyme, named DCA synthase, could be detected in the soluble protein fraction prepared from the young leaves of R. dauricum. DCA synthase catalyzed oxidocyclization of the farnesyl group of grifolic acid to form (+)-DCA as the major reaction product. The DCA synthase reaction proceeds without the need for any cofactors and coenzymes except for molecular oxygen. Interestingly, these catalytic properties of DCA synthase are quite similar to those reported for cannabinoid synthases in the marijuana plant Cannabis sativa L.
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