3QW4

Structure of Leishmania donovani UMP synthase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.239 

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This is version 1.3 of the entry. See complete history. 


Literature

The Leishmania donovani UMP synthase is essential for promastigote viability and has an unusual tetrameric structure that exhibits substrate-controlled oligomerization.

French, J.B., Yates, P.A., Soysa, D.R., Boitz, J.M., Carter, N.S., Chang, B., Ullman, B., Ealick, S.E.

(2011) J Biol Chem 286: 20930-20941

  • DOI: 10.1074/jbc.M111.228213
  • Primary Citation of Related Structures:  
    3QW3, 3QW4

  • PubMed Abstract: 

    • The final two steps of de novo uridine 5'-monophosphate (UMP) biosynthesis are catalyzed by orotate phosphoribosyltransferase (OPRT) and orotidine 5'-monophosphate decarboxylase (OMPDC). In most prokaryotes and simple eukaryotes these two enzymes are encoded by separate genes, whereas in mammals they are expressed as a bifunctional gene product called UMP synthase (UMPS), with OPRT at the N terminus and OMPDC at the C terminus ...

    The final two steps of de novo uridine 5'-monophosphate (UMP) biosynthesis are catalyzed by orotate phosphoribosyltransferase (OPRT) and orotidine 5'-monophosphate decarboxylase (OMPDC). In most prokaryotes and simple eukaryotes these two enzymes are encoded by separate genes, whereas in mammals they are expressed as a bifunctional gene product called UMP synthase (UMPS), with OPRT at the N terminus and OMPDC at the C terminus. Leishmania and some closely related organisms also express a bifunctional enzyme for these two steps, but the domain order is reversed relative to mammalian UMPS. In this work we demonstrate that L. donovani UMPS (LdUMPS) is an essential enzyme in promastigotes and that it is sequestered in the parasite glycosome. We also present the crystal structure of the LdUMPS in complex with its product, UMP. This structure reveals an unusual tetramer with two head to head and two tail to tail interactions, resulting in two dimeric OMPDC and two dimeric OPRT functional domains. In addition, we provide structural and biochemical evidence that oligomerization of LdUMPS is controlled by product binding at the OPRT active site. We propose a model for the assembly of the catalytically relevant LdUMPS tetramer and discuss the implications for the structure of mammalian UMPS.

    Organizational Affiliation: 

    Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UMP synthaseA [auth B], B [auth C]453Leishmania donovaniMutation(s): 0 
Gene Names: LDBPK_160560
EC: 2.4.2.10 (PDB Primary Data), 4.1.1.23 (PDB Primary Data)
UniProt
Find proteins for E9BCQ9 (Leishmania donovani (strain BPK282A1))
Explore E9BCQ9 
Go to UniProtKB:  E9BCQ9
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
U5P (Subject of Investigation/LOI)
Query on U5P
Download Ideal Coordinates CCD File 
 C [auth B], E [auth C], F [auth C]URIDINE-5'-MONOPHOSPHATE
C9 H13 N2 O9 P
DJJCXFVJDGTHFX-XVFCMESISA-N		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
 D [auth C]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.239 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.722α = 90
b = 64.722β = 90
c = 477.596γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
DENZOdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-04-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-02-29
    Changes: Database references
  • Version 1.3: 2017-11-08
    Changes: Refinement description