Crystal structure of human caspase-7 soaked with allosteric inhibitor 2-[(2-acetylphenyl)sulfanyl]benzoic acid

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 

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Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Allosteric Tuning of Caspase-7: A Fragment-Based Drug Discovery Approach.

Vance, N.R.Gakhar, L.Spies, M.A.

(2017) Angew Chem Int Ed Engl 56: 14443-14447

  • DOI: https://doi.org/10.1002/anie.201706959
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The caspase family of cysteine proteases are highly sought-after drug targets owing to their essential roles in apoptosis, proliferation, and inflammation pathways. High-throughput screening efforts to discover inhibitors have gained little traction. Fragment-based screening has emerged as a powerful approach for the discovery of innovative drug leads. This method has become a central facet of drug discovery campaigns in the pharmaceutical industry and academia. A fragment-based drug discovery campaign against human caspase-7 resulted in the discovery of a novel series of allosteric inhibitors. An X-ray crystal structure of caspase-7 bound to a fragment hit and a thorough kinetic characterization of a zymogenic form of the enzyme were used to investigate the allosteric mechanism of inhibition. This work further advances our understanding of the mechanisms of allosteric control of this class of pharmaceutically relevant enzymes, and provides a new path forward for drug discovery efforts.

  • Organizational Affiliation

    Division of Medicinal and Natural Products Chemistry, College of Pharmacy, University of Iowa, 115 S Grand Ave, Iowa City, IA, 52242, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
303Homo sapiensMutation(s): 0 
Gene Names: CASP7MCH3
UniProt & NIH Common Fund Data Resources
Find proteins for P55210 (Homo sapiens)
Explore P55210 
Go to UniProtKB:  P55210
PHAROS:  P55210
GTEx:  ENSG00000165806 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP55210
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 8YM

Download Ideal Coordinates CCD File 
C [auth B]2-[(2-acetylphenyl)sulfanyl]benzoic acid
C15 H12 O3 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.393α = 90
b = 88.393β = 90
c = 185.358γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata 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: 2017-10-18
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Database references
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Refinement description