2OUL

The Structure of Chagasin in Complex with a Cysteine Protease Clarifies the Binding Mode and Evolution of a New Inhibitor Family


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structure of chagasin in complex with a cysteine protease clarifies the binding mode and evolution of an inhibitor family.

Wang, S.X.Pandey, K.C.Scharfstein, J.Whisstock, J.Huang, R.K.Jacobelli, J.Fletterick, R.J.Rosenthal, P.J.Abrahamson, M.Brinen, L.S.Rossi, A.Sali, A.McKerrow, J.H.

(2007) Structure 15: 535-543

  • DOI: 10.1016/j.str.2007.03.012

  • PubMed Abstract: 
  • Protein inhibitors of proteolytic enzymes regulate proteolysis and prevent the pathological effects of excess endogenous or exogenous proteases. Cysteine proteases are a large family of enzymes found throughout the plant and animal kingdoms. Disturba ...

    Protein inhibitors of proteolytic enzymes regulate proteolysis and prevent the pathological effects of excess endogenous or exogenous proteases. Cysteine proteases are a large family of enzymes found throughout the plant and animal kingdoms. Disturbance of the equilibrium between cysteine proteases and natural inhibitors is a key event in the pathogenesis of cancer, rheumatoid arthritis, osteoporosis, and emphysema. A family (I42) of cysteine protease inhibitors (http://merops.sanger.ac.uk) was discovered in protozoan parasites and recently found widely distributed in prokaryotes and eukaryotes. We report the 2.2 A crystal structure of the signature member of the I42 family, chagasin, in complex with a cysteine protease. Chagasin has a unique variant of the immunoglobulin fold with homology to human CD8alpha. Interactions of chagasin with a target protease are reminiscent of the cystatin family inhibitors. Protein inhibitors of cysteine proteases may have evolved more than once on nonhomologous scaffolds.


    Organizational Affiliation

    Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Falcipain 2
A
241Plasmodium falciparumMutation(s): 0 
EC: 3.4.22.-
Find proteins for Q8I6U4 (Plasmodium falciparum)
Go to UniProtKB:  Q8I6U4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chagasin
B
110Trypanosoma cruziMutation(s): 0 
Gene Names: cha
Find proteins for Q966X9 (Trypanosoma cruzi)
Go to UniProtKB:  Q966X9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.186 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 94.236α = 90.00
b = 94.236β = 90.00
c = 119.764γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CNSphasing
DENZOdata reduction
REFMACrefinement
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-02-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Source and taxonomy, Version format compliance
  • Version 1.2: 2018-01-24
    Type: Structure summary