3IP0

Crystal structure of E. coli HPPK in complex with MgAMPCPP and 6-hydroxymethylpterin/6-carboxypterin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.89 Å
  • R-Value Free: 0.128 
  • R-Value Work: 0.128 
  • R-Value Observed: 0.128 

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Literature

Dynamic roles of arginine residues 82 and 92 of Escherichia coli 6-hydroxymethyl-7,8-dihydroptein pyrophosphokinase: Crystallographic studies

Blaszczyk, J., Li, Y., Shi, G., Yan, H., Ji, X.

(2003) Biochemistry 42: 1573-1580

  • DOI: 10.1021/bi0267994
  • Primary Citation of Related Structures:  
    1F9H, 1G4C, 1HQ2, 1IM6, 1KBR, 3IP0

  • PubMed Abstract: 

    • 6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) catalyzes the pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP), the first reaction in the folate biosynthetic pathway. Arginine residues 82 and 92, strictly conserved in 35 HPPK sequences, play dynamic roles in the catalytic cycle of the enzyme ...

    6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) catalyzes the pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP), the first reaction in the folate biosynthetic pathway. Arginine residues 82 and 92, strictly conserved in 35 HPPK sequences, play dynamic roles in the catalytic cycle of the enzyme. At 0.89-A resolution, two distinct conformations are observed for each of the two residues in the crystal structure of the wild-type HPPK in complex with two HP variants, two Mg(2+) ions, and an ATP analogue. Structural information suggests that R92 first binds to the alpha-phosphate group of ATP and then shifts to interact with the beta-phosphate as R82, which initially does not bind to ATP, moves in and binds to alpha-phosphate when the pyrophosphoryl transfer is about to occur. The dynamic roles of R82 and R92 are further elucidated by five more crystal structures of two mutant proteins, R82A and R92A, with and without bound ligands. Two oxidized forms of HP are observed with an occupancy ratio of 0.50:0.50 in the 0.89-A structure. The oxidation of HP has significant impact on its binding to the protein as well as the conformation of nearby residue W89.

    Related Citations: 
    • Catalytic center assembly of HPPK as revealed by the crystal structure of a ternary complex at 1.25-angstrom resolution
      Blaszczyk, J., Shi, G., Yan, H., Ji, X.
      (2000) Structure 8: 1049
    Organizational Affiliation: 

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



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinaseA158Escherichia coli K-12Mutation(s): 0 
Gene Names: b0142, foIK, folK, JW0138
EC: 2.7.6.3
UniProt
Find proteins for P26281 (Escherichia coli (strain K12))
Explore P26281 
Go to UniProtKB:  P26281
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP26281
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
APC
Query on APC
Download Ideal Coordinates CCD File 
D [auth A]DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER
C11 H18 N5 O12 P3
CAWZRIXWFRFUQB-IOSLPCCCSA-N		 Ligand Interaction
HHS
Query on HHS
Download Ideal Coordinates CCD File 
F [auth A]6-CARBOXYPTERIN
C7 H5 N5 O3
QABAUCFGPWONOG-UHFFFAOYSA-N		 Ligand Interaction
HHR
Query on HHR
Download Ideal Coordinates CCD File 
E [auth A]6-HYDROXYMETHYLPTERIN
C7 H7 N5 O2
XGWIBNWDLMIPNF-UHFFFAOYSA-N		 Ligand Interaction
ACT
Query on ACT
Download Ideal Coordinates CCD File 
J [auth A],
K [auth A],
L [auth A],
M [auth A]		ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M		 Ligand Interaction
CL
Query on CL
Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
I [auth A]		CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
B [auth A],
C [auth A]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.89 Å
  • R-Value Free: 0.128 
  • R-Value Work: 0.128 
  • R-Value Observed: 0.128 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.47α = 90
b = 37.91β = 117.18
c = 57.85γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
CNSphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2009-08-15 
  • Released Date: 2009-08-25 
    • Deposition Author(s): Blaszczyk, J., Ji, X.
  • This entry supersedes: 3H4A

Revision History  (Full details and data files)

  • Version 1.0: 2009-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2016-10-12
    Changes: Advisory
  • Version 1.3: 2017-11-01
    Changes: Refinement description