4YQM

Glutathione S-transferase Omega 1 bound to covalent inhibitor C1-27


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Mechanistic evaluation and transcriptional signature of a glutathione S-transferase omega 1 inhibitor.

Ramkumar, K.Samanta, S.Kyani, A.Yang, S.Tamura, S.Ziemke, E.Stuckey, J.A.Li, S.Chinnaswamy, K.Otake, H.Debnath, B.Yarovenko, V.Sebolt-Leopold, J.S.Ljungman, M.Neamati, N.

(2016) Nat Commun 7: 13084-13084

  • DOI: 10.1038/ncomms13084
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Glutathione S-transferase omega 1 (GSTO1) is an atypical GST isoform that is overexpressed in several cancers and has been implicated in drug resistance. Currently, no small-molecule drug targeting GSTO1 is under clinical development. Here we show th ...

    Glutathione S-transferase omega 1 (GSTO1) is an atypical GST isoform that is overexpressed in several cancers and has been implicated in drug resistance. Currently, no small-molecule drug targeting GSTO1 is under clinical development. Here we show that silencing of GSTO1 with siRNA significantly impairs cancer cell viability, validating GSTO1 as a potential new target in oncology. We report on the development and characterization of a series of chloroacetamide-containing potent GSTO1 inhibitors. Co-crystal structures of GSTO1 with our inhibitors demonstrate covalent binding to the active site cysteine. These potent GSTO1 inhibitors suppress cancer cell growth, enhance the cytotoxic effects of cisplatin and inhibit tumour growth in colon cancer models as single agent. Bru-seq-based transcription profiling unravelled novel roles for GSTO1 in cholesterol metabolism, oxidative and endoplasmic stress responses, cytoskeleton and cell migration. Our findings demonstrate the therapeutic utility of GSTO1 inhibitors as anticancer agents and identify the novel cellular pathways under GSTO1 regulation in colorectal cancer.


    Organizational Affiliation

    Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, 1985 Zonal Avenue, Los Angeles, California 90033, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutathione S-transferase omega-1
A, B, C
244Homo sapiensMutation(s): 0 
Gene Names: GSTO1 (GSTTLP28)
EC: 2.5.1.18
Find proteins for P78417 (Homo sapiens)
Go to Gene View: GSTO1
Go to UniProtKB:  P78417
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
4G9
Query on 4G9

Download SDF File 
Download CCD File 
A, B, C
2-chloro-N-[4-chloro-3-(dimethylsulfamoyl)phenyl]acetamide
C10 H12 Cl2 N2 O3 S
YEHYODCKTNLFQU-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A, B, C
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.205 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 182.838α = 90.00
b = 71.247β = 104.08
c = 61.852γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MOLREPphasing
BUSTERrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2015-03-13 
  • Released Date: 2016-10-12 
  • Deposition Author(s): Stuckey, J.A.

Revision History 

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2016-10-19
    Type: Database references