4JJ8

Caspase-3 specific unnatural amino acid peptides


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.937 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Selective Detection of Caspase-3 versus Caspase-7 Using Activity-Based Probes with Key Unnatural Amino Acids.

Vickers, C.J.Gonzalez-Paez, G.E.Wolan, D.W.

(2013) Acs Chem.Biol. 8: 1558-1566

  • DOI: 10.1021/cb400209w
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Caspases are required for essential biological functions, most notably apoptosis and pyroptosis, but also cytokine production, cell proliferation, and differentiation. One of the most well studied members of this cysteine protease family includes exe ...

    Caspases are required for essential biological functions, most notably apoptosis and pyroptosis, but also cytokine production, cell proliferation, and differentiation. One of the most well studied members of this cysteine protease family includes executioner caspase-3, which plays a central role in cell apoptosis and differentiation. Unfortunately, there exists a dearth of chemical tools to selectively monitor caspase-3 activity under complex cellular and in vivo conditions due to its close homology with executioner caspase-7. Commercially available activity-based probes and substrates rely on the canonical DEVD tetrapeptide sequence, which both caspases-3 and -7 recognize with similar affinity, and thus the individual contributions of caspase-3 and/or -7 toward important cellular processes are irresolvable. Here, we analyzed a variety of permutations of the DEVD peptide sequence in order to discover peptides with biased activity and recognition of caspase-3 versus caspases-6, -7, -8, and -9. Through this study, we identify fluorescent and biotinylated probes capable of selective detection of caspase-3 using key unnatural amino acids. Likewise, we determined the X-ray crystal structures of caspases-3, -7, and -8 in complex with our lead peptide inhibitor to elucidate the binding mechanism and active site interactions that promote the selective recognition of caspase-3 over other highly homologous caspase family members.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caspase-7
A, B
255Homo sapiensMutation(s): 0 
Gene Names: CASP7 (MCH3)
EC: 3.4.22.60
Find proteins for P55210 (Homo sapiens)
Go to Gene View: CASP7
Go to UniProtKB:  P55210
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Caspase Inhibitor
C, D
6N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000925
Query on PRD_000925
C,DACE-1MH-ASP-B3L-HLX-1U8Peptide-like / CASPASE inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.937 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.193 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 89.089α = 90.00
b = 89.089β = 90.00
c = 185.535γ = 120.00
Software Package:
Software NamePurpose
SOLVEphasing
PHENIXrefinement
HKL-2000data scaling
HKL-2000data reduction
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-12
    Type: Initial release
  • Version 1.1: 2014-02-19
    Type: Database references