6FJK

Inositol 1,3,4,5,6-pentakisphosphate 2-kinase from A. thaliana in complex with myo-IP6 and ADP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

A Fluorescent Probe Identifies Active Site Ligands of Inositol Pentakisphosphate 2-Kinase.

Whitfield, H.Gilmartin, M.Baker, K.Riley, A.M.Godage, H.Y.Potter, B.V.L.Hemmings, A.M.Brearley, C.A.

(2018) J Med Chem 61: 8838-8846

  • DOI: https://doi.org/10.1021/acs.jmedchem.8b01022
  • Primary Citation of Related Structures:  
    6FJK, 6FL3, 6FL8, 6GFG, 6GFH

  • PubMed Abstract: 

    Inositol pentakisphosphate 2-kinase catalyzes the phosphorylation of the axial 2-OH of myo-inositol 1,3,4,5,6-pentakisphosphate for de novo synthesis of myo-inositol hexakisphosphate. Disruption of inositol pentakisphosphate 2-kinase profoundly influences cellular processes, from nuclear mRNA export and phosphate homeostasis in yeast and plants to establishment of left-right asymmetry in zebrafish. We elaborate an active site fluorescent probe that allows high throughput screening of Arabidopsis inositol pentakisphosphate 2-kinase. We show that the probe has a binding constant comparable to the K m values of inositol phosphate substrates of this enzyme and can be used to prospect for novel substrates and inhibitors of inositol phosphate kinases. We identify several micromolar K i inhibitors and validate this approach by solving the crystal structure of protein in complex with purpurogallin. We additionally solve structures of protein in complexes with epimeric higher inositol phosphates. This probe may find utility in characterization of a wide family of inositol phosphate kinases.


  • Organizational Affiliation

    School of Biological Sciences , University of East Anglia , Norwich Research Park , Norwich NR4 7TJ , U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Inositol-pentakisphosphate 2-kinase
A, B
470Arabidopsis thalianaMutation(s): 0 
Gene Names: AXX17_At5g40720
EC: 2.7.1.158
UniProt
Find proteins for Q93YN9 (Arabidopsis thaliana)
Explore Q93YN9 
Go to UniProtKB:  Q93YN9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ93YN9
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
IHP
Query on IHP

Download Ideal Coordinates CCD File 
C [auth A],
G [auth B]
INOSITOL HEXAKISPHOSPHATE
C6 H18 O24 P6
IMQLKJBTEOYOSI-GPIVLXJGSA-N
ADP
Query on ADP

Download Ideal Coordinates CCD File 
D [auth A],
H [auth B]
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
TRS
Query on TRS

Download Ideal Coordinates CCD File 
L [auth B]2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
ZN
Query on ZN

Download Ideal Coordinates CCD File 
F [auth A],
K [auth B]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B],
J [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.02 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.81α = 88.53
b = 60.34β = 89.18
c = 83.98γ = 63.36
Software Package:
Software NamePurpose
PHENIXrefinement
xia2data reduction
xia2data scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-12
    Type: Initial release
  • Version 1.1: 2018-10-31
    Changes: Data collection, Database references
  • Version 1.2: 2019-06-12
    Changes: Data collection, Structure summary
  • Version 2.0: 2020-10-07
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2024-01-17
    Changes: Data collection, Database references, Refinement description