Abstract
As carbamoylphosphate synthetase (CPS) and aspartate carbamoyltransferase (ACT), the first two enzymes of the pyrimidine biosynthetic pathway, occur in chloroplasts (Plant Physiol., 80 (1986) 126], the regulation of CPS and ACT in spinach (Spinacia oleracea) chloroplasts was investigated. Both chloroplast CPS and ACT were inhibited by UMP and UDP, UMP being most effective. In chloroplasts of mature spinach leaves, the concentration of UMP was estimated to be as high as 1 mM; at this concentration of UMP, CPS and ACT were inhibited 80–90%. Based on these results, the regulation of CPS and ACT by UMP in chloroplasts is thought to be possible.
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