Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 94.39 kDa 
• Atom Count: 6433 
• Residue Count: 765 
• Unique protein chains: 2

1M72

Crystal Structure of Caspase-1 from Spodoptera frugiperda

• DOI: 10.2210/pdb1M72/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Spodoptera frugiperda
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2002-07-18 Released: 2004-01-20 
• Deposition Author(s): Forsyth, C.M., Lemongello, D., Friesen, P.D., Fisher, A.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.232 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 

Literature

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

• PubMed: 14645217 
• DOI: 10.1074/jbc.M312472200
• Primary Citation of Related Structures:  
  1M72


• 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Caspase-1	A, B, C	272	Spodoptera frugiperda	Mutation(s): 0  EC: 3.4.22.36 (PDB Primary Data), 3.4.22 (UniProt)
Find proteins for P89116 (Spodoptera frugiperda) Explore P89116  Go to UniProtKB:  P89116

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Ace-Asp-Glu-Val-Asp-chloromethylketone	D, E, F	6	N/A	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO	A, B, C	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000238	D, E, F	Ac-Asp-Glu-Val-Asp-CMK	Peptide-like /  Inhibitor		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 151.73	α = 90
b = 151.73	β = 90
c = 79.46	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-07-18 
• Released Date: 2004-01-20 
Deposition Author(s): Forsyth, C.M., Lemongello, D., Friesen, P.D., Fisher, A.J.

Revision History 

• 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