Uridine 5'-monophosphate synthase

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Function

Uridine 5’-monophosphate synthase (UMPS) is a bifunctional enzyme catalyzes the formation of uridine monophosphate (UMP)[1]. UMPS N-terminal domain is an orotate phosphoribosyl transferase (OPRT) subunit which catalyzes the addition of ribose-phosphate to orotate forming orotidine 5’-monophosphate (OMP). The C-terminal subunit is orotidine 5’-phosphate decarboxylase (OPD) which decarboxylates OMP to form UMP.

Disease

Defects in UMPS result in the hereditary rare metabolic disease orotic aciduria[2]. UMPS deficiency in Holstein cattle results in an autosomal disorder which causes early embryonic death of offspring[3].

Structural highlights

Human uridine 5-monophosphate synthase OPD subunit dimer complex with UMP (stick model), 2v30

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3D structures of uridine 5'-monophosphate synthase3D structures of uridine 5'-monophosphate synthase

Updated on 08-December-2016

ReferencesReferences

  1. Yablonski MJ, Pasek DA, Han BD, Jones ME, Traut TW. Intrinsic activity and stability of bifunctional human UMP synthase and its two separate catalytic domains, orotate phosphoribosyltransferase and orotidine-5'-phosphate decarboxylase. J Biol Chem. 1996 May 3;271(18):10704-8. PMID:8631878
  2. Grohmann K, Lauffer H, Lauenstein P, Hoffmann GF, Seidlitz G. Hereditary orotic aciduria with epilepsy and without megaloblastic anemia. Neuropediatrics. 2015 Apr;46(2):123-5. doi: 10.1055/s-0035-1547341. Epub 2015 Mar, 10. PMID:25757096 doi:http://dx.doi.org/10.1055/s-0035-1547341
  3. Schwenger B, Schober S, Simon D. DUMPS cattle carry a point mutation in the uridine monophosphate synthase gene. Genomics. 1993 Apr;16(1):241-4. PMID:8486364 doi:http://dx.doi.org/10.1006/geno.1993.1165

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Michal Harel, Alexander Berchansky, Joel L. Sussman