Human uridine 5'-monophosphate synthase stores metabolic potential in inactive biomolecular condensates.

ABSTRACT: Human uridine 5'-monophosphate synthase (HsUMPS) is a bifunctional enzyme that catalyzes the final two steps in de novo pyrimidine biosynthesis. The individual orotate phosphoribosyl transferase and orotidine monophosphate domains have been well characterized, but little is known about the overall structure of the protein and how the organization of domains impacts function. Using a combination of chromatography, electron microscopy, and complementary biophysical methods, we report herein that HsUMPS can be observed in two structurally distinct states, an enzymatically active dimeric form and a nonactive multimeric form. These two states readily interconvert to reach an equilibrium that is sensitive to perturbations of the active site and the presence of substrate. We determined that the s

SUBMITTER: Kim-Holzapfel DM 

PROVIDER: S-EPMC9978035 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature