Caspase-8 specific unnatural amino acid peptides

Experimental Data Snapshot

  • Resolution: 1.73 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Selective inhibition of initiator versus executioner caspases using small peptides containing unnatural amino acids.

Vickers, C.J.Gonzalez-Paez, G.E.Litwin, K.M.Umotoy, J.C.Coutsias, E.A.Wolan, D.W.

(2014) ACS Chem Biol 9: 2194-2198

  • DOI: https://doi.org/10.1021/cb5004256
  • Primary Citation of Related Structures:  
    4PRY, 4PRZ, 4PS0, 4PS1

  • PubMed Abstract: 

    Caspases are fundamental to many essential biological processes, including apoptosis, differentiation, and inflammation. Unregulated caspase activity is also implicated in the development and progression of several diseases, such as cancer, neurodegenerative disorders, and sepsis. Unfortunately, it is difficult to determine exactly which caspase(s) of the 11 isoforms that humans express is responsible for specific biological functions. This lack of resolution is primarily due to highly homologous active sites and overlapping substrates. Currently available peptide-based inhibitors and probes are based on specificity garnered from peptide substrate libraries. For example, the canonical tetrapeptide LETD was discovered as the canonical sequence that is optimally recognized by caspase-8; however, LETD-based inhibitors and substrates promiscuously bind to other isoforms with equal affinity, including caspases-3, -6, and -9. In order to mitigate this problem, we report the identification of a new series of compounds that are >100-fold selective for inhibiting the initiator caspases-8 and -9 over the executioner caspases-3, -6, and -7.

  • Organizational Affiliation

    Departments of Molecular and Experimental Medicine and Chemical Physiology, The Scripps Research Institute , La Jolla, California 92037, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
275Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q14790 (Homo sapiens)
Explore Q14790 
Go to UniProtKB:  Q14790
PHAROS:  Q14790
GTEx:  ENSG00000064012 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14790
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
E, F, G, H
5N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.73 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.87α = 90
b = 144.603β = 123.86
c = 86.193γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.2: 2023-12-06
    Changes: Data collection, Derived calculations