2QX0

Crystal Structure of Yersinia pestis HPPK (Ternary Complex)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and activity of Yersinia pestis 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase as a novel target for the development of antiplague therapeutics.

Blaszczyk, J.Li, Y.Cherry, S.Alexandratos, J.Wu, Y.Shaw, G.Tropea, J.E.Waugh, D.S.Yan, H.Ji, X.

(2007) Acta Crystallogr.,Sect.D 63: 1169-1177

  • DOI: 10.1107/S0907444907047452

  • PubMed Abstract: 
  • 6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) is a key enzyme in the folate-biosynthetic pathway and is essential for microorganisms but absent from mammals. HPPK catalyzes Mg(2+)-dependent pyrophosphoryl transfer from ATP to 6-hydroxyme ...

    6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) is a key enzyme in the folate-biosynthetic pathway and is essential for microorganisms but absent from mammals. HPPK catalyzes Mg(2+)-dependent pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP). Previously, three-dimensional structures of Escherichia coli HPPK (EcHPPK) have been determined at almost every stage of its catalytic cycle and the reaction mechanism has been established. Here, the crystal structure of Yersinia pestis HPPK (YpHPPK) in complex with HP and an ATP analog is presented together with thermodynamic and kinetic characterizations. The two HPPK molecules differ significantly in a helix-loop area (alpha2-Lp3). YpHPPK has lower affinities than EcHPPK for both nucleotides and HP, but its rate constants for the mechanistic steps of both chemical transformation and product release are comparable with those of EcHPPK. Y. pestis, which causes plague, is a category A select agent according to the Centers for Disease Control and Prevention (CDC). Therefore, these structural and biochemical data are valuable for the design of novel medical countermeasures against plague.


    Organizational Affiliation

    Macromolecular Crystallography Laboratory, National Cancer Institute, Frederick, MD 21702, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
7,8-dihydro-6-hydroxymethylpterin-pyrophosphokinase
A, B
159Yersinia pestisMutation(s): 0 
Gene Names: folK
Find proteins for Q7CKD7 (Yersinia pestis)
Go to UniProtKB:  Q7CKD7
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PH2
Query on PH2

Download SDF File 
Download CCD File 
A, B
2-AMINO-6-HYDROXYMETHYL-7,8-DIHYDRO-3H-PTERIDIN-4-ONE
C7 H9 N5 O2
CQQNNQTXUGLUEV-UHFFFAOYSA-N
 Ligand Interaction
APC
Query on APC

Download SDF File 
Download CCD File 
A, B
DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER
ALPHA,BETA-METHYLENEADENOSINE-5'-TRIPHOSPHATE
C11 H18 N5 O12 P3
CAWZRIXWFRFUQB-IOSLPCCCSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A, B
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
PH2Kd: 780 nM BINDINGMOAD
PH2Kd: 780 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 43.400α = 90.00
b = 78.620β = 100.72
c = 52.600γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
ADSCdata collection
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance