4W9N

Enoyl-acyl carrier protein-reductase domain from human fatty acid synthase complexed with triclosan


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Crystal structure of the human Fatty Acid synthase enoyl-acyl carrier protein-reductase domain complexed with triclosan reveals allosteric protein-protein interface inhibition.

Sippel, K.H.Vyas, N.K.Zhang, W.Sankaran, B.Quiocho, F.A.

(2014) J Biol Chem 289: 33287-33295

  • DOI: https://doi.org/10.1074/jbc.M114.608547
  • Primary Citation of Related Structures:  
    4W82, 4W9N

  • PubMed Abstract: 

    Human fatty acid synthase (FAS) is a large, multidomain protein that synthesizes long chain fatty acids. Because these fatty acids are primarily provided by diet, FAS is normally expressed at low levels; however, it is highly up-regulated in many cancers. Human enoyl-acyl carrier protein-reductase (hER) is one of the FAS catalytic domains, and its inhibition by drugs like triclosan (TCL) can increase cytotoxicity and decrease drug resistance in cancer cells. We have determined the structure of hER in the presence and absence of TCL. TCL was not bound in the active site, as predicted, but rather at the protein-protein interface (PPI). TCL binding induces a dimer orientation change that causes downstream structural rearrangement in critical active site residues. Kinetics studies indicate that TCL is capable of inhibiting the isolated hER domain with an IC50 of ∼ 55 μM. Given the hER-TCL structure and the inhibition observed in the hER domain, it seems likely that TCL is observed in the physiologically relevant binding site and that it acts as an allosteric PPI inhibitor. TCL may be a viable scaffold for the development of anti-cancer PPI FAS inhibitors.


  • Organizational Affiliation

    From the Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas 77030 and.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Enoyl-[acyl-carrier-protein] reductase
A, B, D
339Homo sapiensMutation(s): 0 
Gene Names: FASNFAS
EC: 2.3.1.39
UniProt & NIH Common Fund Data Resources
Find proteins for P49327 (Homo sapiens)
Explore P49327 
Go to UniProtKB:  P49327
PHAROS:  P49327
GTEx:  ENSG00000169710 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49327
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Enoyl-[acyl-carrier-protein] reductase339Homo sapiensMutation(s): 0 
Gene Names: FASNFAS
EC: 2.3.1.39
UniProt & NIH Common Fund Data Resources
Find proteins for P49327 (Homo sapiens)
Explore P49327 
Go to UniProtKB:  P49327
PHAROS:  P49327
GTEx:  ENSG00000169710 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49327
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
TCL
Query on TCL

Download Ideal Coordinates CCD File 
L [auth B],
S [auth D]
TRICLOSAN
C12 H7 Cl3 O2
XEFQLINVKFYRCS-UHFFFAOYSA-N
IMD
Query on IMD

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
M [auth C],
P [auth D]
IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
CL
Query on CL

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
I [auth B],
J [auth B],
O [auth C]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

Download Ideal Coordinates CCD File 
K [auth B],
N [auth C],
Q [auth D],
R [auth D]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CCS
Query on CCS
C
L-PEPTIDE LINKINGC5 H9 N O4 SCYS
Binding Affinity Annotations 
IDSourceBinding Affinity
TCL Binding MOAD:  4W9N IC50: 5.47e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.564α = 65.38
b = 75.834β = 88.87
c = 83.264γ = 65.08
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing
EPMRphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Welch FoundationUnited StatesQ-0581

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2014-10-22
    Changes: Database references
  • Version 1.2: 2014-12-10
    Changes: Database references
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary