Low concentrations of palmitoyl coenzyme A inhibit yeast glucose-6-P dehydrogenase (TAKETA, K., AND POGELL, B. M. (1966) J. Biol. Chem. 241, 720). This inhibition is prevented or reversed by bovine serum albumin, mycobacterial polysaccharides, or alkylated cyclodextrins. Sephadex chromatography and sucrose density gradient centrifugation show that palmitoyl-CoA inhibits by dissociating the tetr...