4JRZ

Human LTC4 synthase in complex with product analogs - implications for enzyme catalysis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of Leukotriene C4 Synthase in Complex with Product Analogs: IMPLICATIONS FOR THE ENZYME MECHANISM.

Niegowski, D.Kleinschmidt, T.Olsson, U.Ahmad, S.Rinaldo-Matthis, A.Haeggstrom, J.Z.

(2014) J.Biol.Chem. 289: 5199-5207

  • DOI: 10.1074/jbc.M113.534628
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Leukotriene (LT) C4 synthase (LTC4S) catalyzes the conjugation of the fatty acid LTA4 with the tripeptide GSH to produce LTC4, the parent compound of the cysteinyl leukotrienes, important mediators of asthma. Here we mutated Trp-116 in human LTC4S, a ...

    Leukotriene (LT) C4 synthase (LTC4S) catalyzes the conjugation of the fatty acid LTA4 with the tripeptide GSH to produce LTC4, the parent compound of the cysteinyl leukotrienes, important mediators of asthma. Here we mutated Trp-116 in human LTC4S, a residue proposed to play a key role in substrate binding, into an Ala or Phe. Biochemical and structural characterization of these mutants along with crystal structures of the wild type and mutated enzymes in complex with three product analogs, viz. S-hexyl-, 4-phenyl-butyl-, and 2-hydroxy-4-phenyl-butyl-glutathione, provide new insights to binding of substrates and product, identify a new conformation of the GSH moiety at the active site, and suggest a route for product release, aided by Trp-116.


    Organizational Affiliation

    From the Division of Chemistry II, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-107 77 Stockholm, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Leukotriene C4 synthase
A
156Homo sapiensMutation(s): 0 
Gene Names: LTC4S
EC: 4.4.1.20
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Membrane-Associated Proteins in Eicosanoid and Glutathione Metabolism (MAPEG)
Protein: 
Leukotriene LTC4 Synthase in complex with glutathione
Find proteins for Q16873 (Homo sapiens)
Go to Gene View: LTC4S
Go to UniProtKB:  Q16873
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
PAM
Query on PAM

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Download CCD File 
A
PALMITOLEIC ACID
C16 H30 O2
SECPZKHBENQXJG-FPLPWBNLSA-N
 Ligand Interaction
NI
Query on NI

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Download CCD File 
A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
PLM
Query on PLM

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Download CCD File 
A
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
GTX
Query on GTX

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Download CCD File 
A
S-HEXYLGLUTATHIONE
C16 H30 N3 O6 S
HXJDWCWJDCOHDG-RYUDHWBXSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.233 
  • Space Group: F 2 3
Unit Cell:
Length (Å)Angle (°)
a = 169.108α = 90.00
b = 169.108β = 90.00
c = 169.108γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing
SCALAdata scaling
ADSCdata collection
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-01
    Type: Initial release
  • Version 1.1: 2014-01-22
    Type: Database references
  • Version 1.2: 2014-03-12
    Type: Database references