(kär′bə-mĭl-trăns′fə-rās′, -rāz′)
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The first three steps are catalyzed by CAD, [4] a trifunctional cytoplasmic enzyme cluster containing carbamylphosphate synthetase, aspartate carbamyltransferase, and dihydroorotase (Fig.
Activity of CPSase was assessed by three separate methods: (i) by trapping the carbamylphosphate (CP) synthesized, or the cyanate released from the breakdown of CP, as hydroxyurea by reaction with hydroxylamine as described by Levine and Kretchmer (1971); (ii) in the presence of excess ornithine and commercial ornithine carbamyltransferase (OCTase) to convert all the CP synthesized by the plant enzyme to citrulline, which was isolated as described by Lovatt et al.
Abbreviations: [Sigma]A + U, total combined pool of arginine plus urea; YFE, young fully expanded; [Sigma]UMP, sum of the uridine nucleotides converted to UMP by acid hydrolysis at 100 [degrees] C; [Psi]s, osmotic potential; CPSase, carbamylphosphate synthetase; CP, carbamylphosphate; GS, glutamine synthetase; OCTase, ornithine carbamyltransferase; ACTase, aspartate carbamyltransferase.