3UTC

Ec_IspH in complex with (E)-4-hydroxybut-3-enyl diphosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.147 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Discovery of acetylene hydratase activity of the iron-sulphur protein IspH.

Span, I.Wang, K.Wang, W.Zhang, Y.Bacher, A.Eisenreich, W.Li, K.Schulz, C.Oldfield, E.Groll, M.

(2012) Nat Commun 3: 1042-1042

  • DOI: 10.1038/ncomms2052
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The final step of the methylerythritol phosphate isoprenoid biosynthesis pathway is catalysed by the iron-sulphur enzyme IspH, producing the universal precursors of terpenes: isopentenyl diphosphate and dimethylallyl diphosphate. Here we report an un ...

    The final step of the methylerythritol phosphate isoprenoid biosynthesis pathway is catalysed by the iron-sulphur enzyme IspH, producing the universal precursors of terpenes: isopentenyl diphosphate and dimethylallyl diphosphate. Here we report an unforeseen reaction discovered during the investigation of the interaction of IspH with acetylene inhibitors by X-ray crystallography, Mößbauer, and nuclear magnetic resonance spectroscopy. In addition to its role as a 2H(+)/2e(-) reductase, IspH can hydrate acetylenes to aldehydes and ketones via anti-Markovnikov/Markovnikov addition. The reactions only occur with the oxidised protein and proceed via η(1)-O-enolate intermediates. One of these is characterized crystallographically and contains a C4 ligand oxygen bound to the unique, fourth iron in the 4Fe-4S cluster: this intermediate subsequently hydrolyzes to produce an aldehyde product. This unexpected side to IspH reactivity is of interest in the context of the mechanism of action of other acetylene hydratases, as well as in the design of antiinfectives targeting IspH.


    Organizational Affiliation

    Department of Physics, Knox College, 2 East South Street, Galesburg, Illinois 61401, USA.,Department of Chemistry, Center for Integrated Protein Science, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany.,Center for Biophysics and Computational Biology, 607 South Mathews Avenue, University of Illinois, Urbana, Illinois 61801, USA.,Department of Chemistry, 600 South Mathews Avenue, University of Illinois, Urbana, Illinois 61801, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
4-hydroxy-3-methylbut-2-enyl diphosphate reductase
A, B
324Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: ispH (lytB, yaaE)
EC: 1.17.7.4
Find proteins for P62623 (Escherichia coli (strain K12))
Go to UniProtKB:  P62623
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SF4
Query on SF4

Download SDF File 
Download CCD File 
A, B
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC
 Ligand Interaction
0JX
Query on 0JX

Download SDF File 
Download CCD File 
A, B
(3E)-4-hydroxybut-3-en-1-yl trihydrogen diphosphate
C4 H10 O8 P2
YCGPFMCUJHDYHD-HNQUOIGGSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.147 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 70.120α = 90.00
b = 80.790β = 90.00
c = 112.560γ = 90.00
Software Package:
Software NamePurpose
RemDAqdata collection
XSCALEdata scaling
REFMACrefinement
XDSdata reduction
REFMACphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-09-05
    Type: Initial release
  • Version 1.1: 2012-09-19
    Type: Database references