4EOH

Crystal Structure of Human PL Kinase with bound Theophylline


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structures of human pyridoxal kinase in complex with the neurotoxins, ginkgotoxin and theophylline: insights into pyridoxal kinase inhibition.

Gandhi, A.K.Desai, J.V.Ghatge, M.S.di Salvo, M.L.Di Biase, S.Danso-Danquah, R.Musayev, F.N.Contestabile, R.Schirch, V.Safo, M.K.

(2012) Plos One 7: e40954-e40954

  • DOI: 10.1371/journal.pone.0040954
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Several drugs and natural compounds are known to be highly neurotoxic, triggering epileptic convulsions or seizures, and causing headaches, agitations, as well as other neuronal symptoms. The neurotoxic effects of some of these compounds, including t ...

    Several drugs and natural compounds are known to be highly neurotoxic, triggering epileptic convulsions or seizures, and causing headaches, agitations, as well as other neuronal symptoms. The neurotoxic effects of some of these compounds, including theophylline and ginkgotoxin, have been traced to their inhibitory activity against human pyridoxal kinase (hPL kinase), resulting in deficiency of the active cofactor form of vitamin B₆, pyridoxal 5'-phosphate (PLP). Pyridoxal (PL), an inactive form of vitamin B₆ is converted to PLP by PL kinase. PLP is the B₆ vitamer required as a cofactor for over 160 enzymatic activities essential in primary and secondary metabolism. We have performed structural and kinetic studies on hPL kinase with several potential inhibitors, including ginkgotoxin and theophylline. The structural studies show ginkgotoxin and theophylline bound at the substrate site, and are involved in similar protein interactions as the natural substrate, PL. Interestingly, the phosphorylated product of ginkgotoxin is also observed bound at the active site. This work provides insights into the molecular basis of hPL kinase inhibition and may provide a working hypothesis to quickly screen or identify neurotoxic drugs as potential hPL kinase inhibitors. Such adverse effects may be prevented by administration of an appropriate form of vitamin B₆, or provide clues of how to modify these drugs to help reduce their hPL kinase inhibitory effects.


    Organizational Affiliation

    Department of Medicinal Chemistry, Institute for Structural Biology and Drug Discovery, Virginia Commonwealth University, Richmond, Virginia, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pyridoxal Kinase
A, B
312Homo sapiensMutation(s): 0 
Gene Names: PDXK (C21orf124, C21orf97, PKH, PNK)
EC: 2.7.1.35
Find proteins for O00764 (Homo sapiens)
Go to Gene View: PDXK
Go to UniProtKB:  O00764
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
TEP
Query on TEP

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Download CCD File 
A, B
THEOPHYLLINE
C7 H8 N4 O2
ZFXYFBGIUFBOJW-UHFFFAOYSA-N
 Ligand Interaction
MPD
Query on MPD

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Download CCD File 
A, B
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TEPKi: 50000 nM BINDINGMOAD
TEPKi: 50000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.205 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 92.302α = 90.00
b = 115.848β = 90.00
c = 171.904γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
d*TREKdata reduction
CNSrefinement
PDB_EXTRACTdata extraction
CNSphasing
CrystalCleardata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-02
    Type: Initial release
  • Version 1.1: 2012-08-22
    Type: Database references