1YA4

Crystal Structure of Human Liver Carboxylesterase 1 in complex with tamoxifen


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structural insights into drug processing by human carboxylesterase 1: tamoxifen, mevastatin, and inhibition by benzil.

Fleming, C.D.Bencharit, S.Edwards, C.C.Hyatt, J.L.Tsurkan, L.Bai, F.Fraga, C.Morton, C.L.Howard-Williams, E.L.Potter, P.M.Redinbo, M.R.

(2005) J Mol Biol 352: 165-177

  • DOI: https://doi.org/10.1016/j.jmb.2005.07.016
  • Primary Citation of Related Structures:  
    1YA4, 1YA8, 1YAH, 1YAJ

  • PubMed Abstract: 

    Human carboxylesterase 1 (hCE1) exhibits broad substrate specificity and is involved in xenobiotic processing and endobiotic metabolism. We present and analyze crystal structures of hCE1 in complexes with the cholesterol-lowering drug mevastatin, the breast cancer drug tamoxifen, the fatty acyl ethyl ester (FAEE) analogue ethyl acetate, and the novel hCE1 inhibitor benzil. We find that mevastatin does not appear to be a substrate for hCE1, and instead acts as a partially non-competitive inhibitor of the enzyme. Similarly, we show that tamoxifen is a low micromolar, partially non-competitive inhibitor of hCE1. Further, we describe the structural basis for the inhibition of hCE1 by the nanomolar-affinity dione benzil, which acts by forming both covalent and non-covalent complexes with the enzyme. Our results provide detailed insights into the catalytic and non-catalytic processing of small molecules by hCE1, and suggest that the efficacy of clinical drugs may be modulated by targeted hCE1 inhibitors.


  • Organizational Affiliation

    Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CES1 protein
A, B, C
532Homo sapiensMutation(s): 0 
EC: 3.1.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P23141 (Homo sapiens)
Explore P23141 
Go to UniProtKB:  P23141
PHAROS:  P23141
GTEx:  ENSG00000198848 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23141
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CTX
Query on CTX

Download Ideal Coordinates CCD File 
H [auth A]
I [auth A]
N [auth B]
O [auth B]
T [auth C]
H [auth A],
I [auth A],
N [auth B],
O [auth B],
T [auth C],
U [auth C]
(Z)-2-[4-(1,2)-DIPHENYL-1-BUTENYL)-PHENOXY]-N,N-DIMETHYLETHANAMINE
C26 H29 N O
NKANXQFJJICGDU-QPLCGJKRSA-N
SIA
Query on SIA

Download Ideal Coordinates CCD File 
E [auth A],
K [auth B],
Q [auth C]
N-acetyl-alpha-neuraminic acid
C11 H19 N O9
SQVRNKJHWKZAKO-YRMXFSIDSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
D [auth A],
J [auth B],
P [auth C]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
L [auth B]
M [auth B]
R [auth C]
F [auth A],
G [auth A],
L [auth B],
M [auth B],
R [auth C],
S [auth C]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Binding Affinity Annotations 
IDSourceBinding Affinity
CTX PDBBind:  1YA4 Ki: 1.52e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.369α = 90
b = 179.954β = 90
c = 201.584γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Structure summary
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Refinement description, Structure summary