As the intermediate of these steps, orotidine-
5’-monophosphate, was not detected in plant tissue, and
these two activities co-purified through several purification
steps, it was suggested that these two enzymes form a
complex in vivo (Ashihara, 1978; Walther et al., 1984). In
fact, recent results demonstrate that OPRT and ODCase
reside in a single polypeptide that is termed UMP synthase.
This bifunctional enzyme catalyzes the last two steps of the de novo pyrimidine pathway in plants as well
as mammals
As the intermediate of these steps, orotidine-5’-monophosphate, was not detected in plant tissue, andthese two activities co-purified through several purificationsteps, it was suggested that these two enzymes form acomplex in vivo (Ashihara, 1978; Walther et al., 1984). Infact, recent results demonstrate that OPRT and ODCasereside in a single polypeptide that is termed UMP synthase.This bifunctional enzyme catalyzes the last two steps of the de novo pyrimidine pathway in plants as wellas mammals
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