Spinach acyl-carrier proteins: structure, regulation, and progress towards cloning.

specificity is determined by the condensing enzyme, namely 8-ketoacyl-[acyl-carrier-proteinlsynthase 11. For the barley complex they are CoA derivatives which give rise to the C,,, C,, and C,, 3-oxoacyl key intermediates. One can speculate that the condensing enzyme activity specified by the cer-cqu-determined polypeptide is responsible for the noted substrate specificity. Therefore, should one wish to isolate the cer-cqu gene, whose product is part of either epidermal plasmalemma or cell walls, the most feasible approach is to exploit its expected homology with the gene for the condensing enzyme of palmitoyl elongase.