Gossypol (GSP)

Gossypol is a natural phenol derived from the cotton plant (genus Gossypium). Gossypol is a phenolic aldehyde that permeates cells and acts as an inhibitor for several dehydrogenase enzymes. It is a yellow pigment. Among other things, it has been tested as a male oral contraceptive in China. In addition to its contraceptive properties, gossypol has also long been known to possess antimalarial properties. Other researchers are investigating the anticancer properties of gossypol. Gossypol is a terpenoid aldehyde, which is formed metabolically through acetate via the isoprenoid pathway. Sesquiterpene dimer undergoes a radical coupling reaction to form gossypol. Geranyl pyrophosphate (GPP) and IPP make sesquiterpene precursor, farnesyl diphosphate (FPP), for gossypol. The biosynthesis of gossypol is summarized in figure below.