1MDW

Crystal Structure of Calcium-Bound Protease Core of Calpain II Reveals the Basis for Intrinsic Inactivation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Calpain silencing by a reversible intrinsic mechanism.

Moldoveanu, T.Hosfield, C.M.Lim, D.Jia, Z.Davies, P.L.

(2003) Nat.Struct.Mol.Biol. 10: 371-378

  • DOI: 10.1038/nsb917
  • Also Cited By: 1TLO, 3DF0, 1TL9

  • PubMed Abstract: 
  • Uncontrolled activation of calpain can lead to necrotic cell death and irreversible tissue damage. We have discovered an intrinsic mechanism whereby the autolysis-generated protease core fragment of calpain is inactivated through the inherent instabi ...

    Uncontrolled activation of calpain can lead to necrotic cell death and irreversible tissue damage. We have discovered an intrinsic mechanism whereby the autolysis-generated protease core fragment of calpain is inactivated through the inherent instability of a key alpha-helix. This auto-inactivation state was captured by the 1.9 A Ca(2+)-bound structure of the protease core from m-calpain, and sequence alignments suggest that it applies to about half of the calpain isoforms. Intact calpain large subunits are also subject to this inhibition, which can be prevented through assembly of the heterodimers. Other isoforms or their released cores are not silenced by this mechanism and might contribute to calpain patho-physiologies.


    Related Citations: 
    • A Ca(2+) Switch Aligns the Active Site of Calpain
      Moldoveanu, T.,Hosfield, C.M.,Lim, D.,Elce, J.S.,Jia, Z.,Davies, P.L.
      (2002) Cell 108: 649
    • Crystal Structure of Calpain Reveals the Structural Basis for Ca(2+)-dependent Protease Activity and a Novel Mode of Enzyme Activation
      Hosfield, C.M.,Elce, J.S.,Davies, P.L.,Jia, Z.
      (1999) Embo J. 18: 6880


    Organizational Affiliation

    Department of Biochemistry and the Protein Engineering Network of Centres of Excellence, Queen's University, Kingston, Ontario K7L 3N6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calpain II, catalytic subunit
A, B
328Rattus norvegicusMutation(s): 1 
Gene Names: Capn2
EC: 3.4.22.53
Find proteins for Q07009 (Rattus norvegicus)
Go to UniProtKB:  Q07009
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 62.600α = 90.00
b = 80.600β = 103.90
c = 75.300γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-29
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance