Crystal Structure of Caspase-1 from Spodoptera frugiperda

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 

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This is version 1.3 of the entry. See complete history


Crystal structure of an invertebrate caspase.

Forsyth, C.M.Lemongello, D.LaCount, D.J.Friesen, P.D.Fisher, A.J.

(2004) J Biol Chem 279: 7001-7008

  • DOI: https://doi.org/10.1074/jbc.M312472200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Caspases play an essential role in the execution of apoptosis. These cysteine proteases are highly conserved among metazoans and are translated as inactive zymogens, which are activated by proteolytic cleavages to generate the large and small subunits and remove the N-terminal prodomain. The 2.3 A resolution crystal structure of active Sf-caspase-1, the principal effector caspase of the insect Spodoptera frugiperda, is presented here. The structure represents the first nonhuman caspase to be resolved. The structure of the cleaved and active protease was determined with the tetrapeptide inhibitor N-acetyl-Asp-Glu-Val-Asp-chloromethylketone covalently bonded to the active site cysteine. As expected, the overall fold of Sf-caspase-1 is exceedingly similar to that of the five active caspases from humans solved to date. The overall structure and active site arrangement of Sf-caspase-1 is most comparable with that of the human effector caspases, with which it shares highest sequence homology. The most prominent structural difference with Sf-caspase-1 is the position of the N-terminal region of the large subunit. Unlike the N terminus of human caspases, the N terminus of Sf-caspase-1 originates from the active site side where it interacts with active site loop L2 and then extends to the backside of the heterodimer. This unusual structural arrangement raises the possibility that the N-terminal prodomain plays a regulatory role during effector caspase activation or enzyme activity in insects.

  • Organizational Affiliation

    Department of Chemistry, Section of Molecular and Cellular Biology, University of California, Davis 95616, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
C [auth B],
E [auth C]
272Spodoptera frugiperdaMutation(s): 0 
Find proteins for P89116 (Spodoptera frugiperda)
Explore P89116 
Go to UniProtKB:  P89116
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP89116
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ace-Asp-Glu-Val-Asp-chloromethylketoneB [auth D],
D [auth E],
6N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.73α = 90
b = 151.73β = 90
c = 79.46γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-20
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2013-02-27
    Changes: Other