4J7Y

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.250 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 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: https://doi.org/10.1074/jbc.M113.534628
  • Primary Citation of Related Structures:  
    4J7T, 4J7Y, 4JC7, 4JCZ, 4JRZ

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leukotriene C4 synthase156Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16873
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.250 
  • Space Group: F 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 169.275α = 90
b = 169.275β = 90
c = 169.275γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-01
    Type: Initial release
  • Version 1.1: 2014-01-22
    Changes: Database references
  • Version 1.2: 2014-03-12
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description