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An enzyme catalyzing ring closure of N-carbamoyl-l-aspartate to form l-5,6-dihydroorotate and water; an enzyme in pyrimidine biosynthesis.
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subunit, one is a sugar beet dihydroorotase, one is a sugar beet translation initiation factor 1A and two others are of a unknown protein type.
The first three steps are catalyzed by CAD, [4] a trifunctional cytoplasmic enzyme cluster containing carbamylphosphate synthetase, aspartate carbamyltransferase, and dihydroorotase (Fig.

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