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Metabolism and Enzymology

Inhibition of Acetyl-CoA Carboxylase Activity by Haloxyfop and Tralkoxydim

Dow Chemical USA, 2800 Mitchell Dr., Walnut Creek, California 94598-0902

Acetyl-coenzyme A (CoA) carboxylase from maize (Zea mays L.) is inhibited by nanomolar concentrations of both haloxyfop, an aryloxyphenoxypropionate, and tralkoxydim, a cyclohexanedione herbicide. These results suggest that acetyl-CoA carboxylase, which catalyzes the first committed step in fatty acid biosynthesis, may be the target of these herbicides, contrary to an earlier report suggesting that aryloxyphenoxypropionate herbicides do not inhibit acetyl-CoA carboxylase.