3UDE

Crystal structure of E. coli HPPK in complex with bisubstrate analogue inhibitor J1B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.184 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Bisubstrate analogue inhibitors of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase: New design with improved properties.

Shi, G.Shaw, G.Liang, Y.H.Subburaman, P.Li, Y.Wu, Y.Yan, H.Ji, X.

(2012) Bioorg Med Chem 20: 47-57

  • DOI: 10.1016/j.bmc.2011.11.032
  • Primary Citation of Related Structures:  
    3UD5, 3UDV, 3UDE

  • PubMed Abstract: 
  • 6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK), a key enzyme in the folate biosynthetic pathway, catalyzes the pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin. The enzyme is essential for microorganisms, is absent from humans, and is not the target for any existing antibiotics ...

    6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK), a key enzyme in the folate biosynthetic pathway, catalyzes the pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin. The enzyme is essential for microorganisms, is absent from humans, and is not the target for any existing antibiotics. Therefore, HPPK is an attractive target for developing novel antimicrobial agents. Previously, we characterized the reaction trajectory of HPPK-catalyzed pyrophosphoryl transfer and synthesized a series of bisubstrate analog inhibitors of the enzyme by linking 6-hydroxymethylpterin to adenosine through 2, 3, or 4 phosphate groups. Here, we report a new generation of bisubstrate analog inhibitors. To improve protein binding and linker properties of such inhibitors, we have replaced the pterin moiety with 7,7-dimethyl-7,8-dihydropterin and the phosphate bridge with a piperidine linked thioether. We have synthesized the new inhibitors, measured their K(d) and IC(50) values, determined their crystal structures in complex with HPPK, and established their structure-activity relationship. 6-Carboxylic acid ethyl ester-7,7-dimethyl-7,8-dihydropterin, a novel intermediate that we developed recently for easy derivatization at position 6 of 7,7-dimethyl-7,8-dihydropterin, offers a much high yield for the synthesis of bisubstrate analogs than that of previously established procedure.


    Related Citations: 
    • Bisubstrate analogue inhibitors of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase: synthesis and biochemical and crystallographic studies.
      Shi, G., Blaszczyk, J., Ji, X., Yan, H.
      (2001) J Med Chem 44: 1364

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinaseA158Escherichia coli K-12Mutation(s): 0 
Gene Names: b0142foIKfolKJW0138
EC: 2.7.6.3
UniProt
Find proteins for P26281 (Escherichia coli (strain K12))
Explore P26281 
Go to UniProtKB:  P26281
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
J1B
Query on J1B

Download Ideal Coordinates CCD File 
B [auth A]5'-S-[1-(2-{[(2-amino-7,7-dimethyl-4-oxo-3,4,7,8-tetrahydropteridin-6-yl)methyl]amino}ethyl)piperidin-4-yl]-5'-thioadenosine
C26 H38 N12 O4 S
SQZWJXDKQKNJEE-KYKAGHOCSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
C [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.91α = 90
b = 70.98β = 90
c = 36.38γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection
HKL-2000data reduction
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2011-10-28 
  • Released Date: 2012-01-04 
  • Deposition Author(s): Shaw, G., Shi, G., Ji, X.

Revision History  (Full details and data files)

  • Version 1.0: 2012-01-04
    Type: Initial release
  • Version 1.1: 2012-01-18
    Changes: Database references