2UUH

Crystal structure of Human Leukotriene C4 Synthase in complex with substrate glutathione


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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This is version 1.2 of the entry. See complete history


Literature

Structural Basis for Synthesis of Inflammatory Mediators by Human Leukotriene C4 Synthase.

Martinez Molina, D.Wetterholm, A.Kohl, A.Mccarthy, A.A.Niegowski, D.Ohlson, E.Hammarberg, T.Eshaghi, S.Haeggstrom, J.Z.Nordlund, P.

(2007) Nature 448: 613

  • DOI: 10.1038/nature06009
  • Primary Citation of Related Structures:  
    2UUH, 2UUI

  • PubMed Abstract: 
  • Cysteinyl leukotrienes are key mediators in inflammation and have an important role in acute and chronic inflammatory diseases of the cardiovascular and respiratory systems, in particular bronchial asthma. In the biosynthesis of cysteinyl leukotrienes, conversion of arachidonic acid forms the unstable epoxide leukotriene A4 (LTA4) ...

    Cysteinyl leukotrienes are key mediators in inflammation and have an important role in acute and chronic inflammatory diseases of the cardiovascular and respiratory systems, in particular bronchial asthma. In the biosynthesis of cysteinyl leukotrienes, conversion of arachidonic acid forms the unstable epoxide leukotriene A4 (LTA4). This intermediate is conjugated with glutathione (GSH) to produce leukotriene C4 (LTC4) in a reaction catalysed by LTC4 synthase: this reaction is the key step in cysteinyl leukotriene formation. Here we present the crystal structure of the human LTC4 synthase in its apo and GSH-complexed forms to 2.00 and 2.15 A resolution, respectively. The structure reveals a homotrimer, where each monomer is composed of four transmembrane segments. The structure of the enzyme in complex with substrate reveals that the active site enforces a horseshoe-shaped conformation on GSH, and effectively positions the thiol group for activation by a nearby arginine at the membrane-enzyme interface. In addition, the structure provides a model for how the omega-end of the lipophilic co-substrate is pinned at one end of a hydrophobic cleft, providing a molecular 'ruler' to align the reactive epoxide at the thiol of glutathione. This provides new structural insights into the mechanism of LTC4 formation, and also suggests that the observed binding and activation of GSH might be common for a family of homologous proteins important for inflammatory and detoxification responses.


    Organizational Affiliation

    Division of Biophysics, Karolinska Institutet, 17177 Stockholm, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LEUKOTRIENE C4 SYNTHASEA156Homo sapiensMutation(s): 0 
Gene Names: LTC4S
EC: 4.4.1.20 (PDB Primary Data), 2.5.1 (UniProt)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q16873 (Homo sapiens)
Explore Q16873 
Go to UniProtKB:  Q16873
PHAROS:  Q16873
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LMU (Subject of Investigation/LOI)
Query on LMU

Download Ideal Coordinates CCD File 
D [auth A]DODECYL-ALPHA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-YHBSTRCHSA-N
 Ligand Interaction
GSH (Subject of Investigation/LOI)
Query on GSH

Download Ideal Coordinates CCD File 
E [auth A]GLUTATHIONE
C10 H17 N3 O6 S
RWSXRVCMGQZWBV-WDSKDSINSA-N
 Ligand Interaction
PLM (Subject of Investigation/LOI)
Query on PLM

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G [auth A], H [auth A], I [auth A], K [auth A], L [auth A]PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
PAM (Subject of Investigation/LOI)
Query on PAM

Download Ideal Coordinates CCD File 
F [auth A]PALMITOLEIC ACID
C16 H30 O2
SECPZKHBENQXJG-FPLPWBNLSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
J [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
NI
Query on NI

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: F 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 169.94α = 90
b = 169.94β = 90
c = 169.94γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2011-12-07
    Changes: Advisory, Atomic model, Derived calculations, Non-polymer description, Other