2J4L

Crystal structure of uridylate kinase from Sulfolobus solfataricus in complex with UTP to 2.8 Angstrom resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.246 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural and Enzymatic Investigation of the Sulfolobus Solfataricus Uridylate Kinase Shows Competitive Utp Inhibition and the Lack of GTP Stimulation

Jensen, K.S.Johansson, E.Jensen, K.F.

(2007) Biochemistry 46: 2745

  • DOI: 10.1021/bi0618159
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The pyrH gene encoding uridylate kinase (UMPK) from the extreme thermoacidophilic archaeon Sulfolobus solfataricus was cloned and expressed in Escherichia coli, and the enzyme (SsUMPK) was purified. Size exclusion chromatography and sedimentation exp ...

    The pyrH gene encoding uridylate kinase (UMPK) from the extreme thermoacidophilic archaeon Sulfolobus solfataricus was cloned and expressed in Escherichia coli, and the enzyme (SsUMPK) was purified. Size exclusion chromatography and sedimentation experiments showed that the oligomeric state in solution is hexameric. SsUMPK shows maximum catalytic rate at pH 7.0, and variation of pH only influences the turnover number. Catalysis proceeds by a sequential reaction mechanism of random order and depends on a divalent cation. The enzyme exhibits high substrate specificity toward UMP and ATP and is inhibited by UTP, whereas CTP and GTP do not influence activity. UTP binds to the enzyme with a sigmoid binding curve, whereas GTP does not bind. The crystal structure of SsUMPK was determined for three different complexes, a ternary complex with UMP and the nonhydrolyzable ATP analogue beta,gamma-methylene-ATP, a complex with UMP, and a complex with UTP to 2.1, 2.2, and 2.8 A resolution, respectively. One UTP molecule was bound in the acceptor site per subunit, leading to the exclusion of both substrates from the active site. In all cases, SsUMPK crystallized as a hexamer with the main fold shared with other prokaryotic UMPKs. Similar to UMPK from Pyrococcus furiosus, SsUMPK has an active site enclosing loop. This loop was only ordered in one subunit in the ternary complex, which also contained an unusual arrangement of ligands (possibly a dinucleotide) in the active site and an altered orientation of the catalytic residue Arg48 relative to the other five subunits of the hexamer.


    Organizational Affiliation

    Department of Biological Chemistry, Institute of Molecular Biology, University of Copenhagen, SĂžlvgade 83H, DK-1307 Copenhagen K, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
URIDYLATE KINASE
A, B, C, D, E, F, G, H, I, J, K, L
226Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)Mutation(s): 0 
Gene Names: pyrH
EC: 2.7.4.22
Find proteins for Q97ZE2 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Go to UniProtKB:  Q97ZE2
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
UTP
Query on UTP

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
URIDINE 5'-TRIPHOSPHATE
C9 H15 N2 O15 P3
PGAVKCOVUIYSFO-XVFCMESISA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
B, C, D, E, I, J, L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.246 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 224.750α = 90.00
b = 79.030β = 96.56
c = 223.470γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
MOLREPphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-02-27
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-17
    Type: Data collection