3F75

Activated Toxoplasma gondii cathepsin L (TgCPL) in complex with its propeptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Toxoplasma gondii cathepsin L is the primary target of the invasion-inhibitory compound morpholinurea-leucyl-homophenyl-vinyl sulfone phenyl.

Larson, E.T.Parussini, F.Huynh, M.H.Giebel, J.D.Kelley, A.M.Zhang, L.Bogyo, M.Merritt, E.A.Carruthers, V.B.

(2009) J.Biol.Chem. 284: 26839-26850

  • DOI: 10.1074/jbc.M109.003780

  • PubMed Abstract: 
  • The protozoan parasite Toxoplasma gondii relies on post-translational modification, including proteolysis, of proteins required for recognition and invasion of host cells. We have characterized the T. gondii cysteine protease cathepsin L (TgCPL), one ...

    The protozoan parasite Toxoplasma gondii relies on post-translational modification, including proteolysis, of proteins required for recognition and invasion of host cells. We have characterized the T. gondii cysteine protease cathepsin L (TgCPL), one of five cathepsins found in the T. gondii genome. We show that TgCPL is the primary target of the compound morpholinurea-leucyl-homophenyl-vinyl sulfone phenyl (LHVS), which was previously shown to inhibit parasite invasion by blocking the release of invasion proteins from microneme secretory organelles. As shown by fluorescently labeled LHVS and TgCPL-specific antibodies, TgCPL is associated with a discrete vesicular structure in the apical region of extracellular parasites but is found in multiple puncta throughout the cytoplasm of intracellular replicating parasites. LHVS fails to label cells lacking TgCPL due to targeted disruption of the TgCPL gene in two different parasite strains. We present a structural model for the inhibition of TgCPL by LHVS based on a 2.0 A resolution crystal structure of TgCPL in complex with its propeptide. We discuss possible roles for TgCPL as a protease involved in the degradation or limited proteolysis of parasite proteins involved in invasion.


    Organizational Affiliation

    Medical Structural Genomics of Pathogenic Protozoa Consortium, University of Washington, Seattle, Washington 98195-7742, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cathepsin L Protease
A
224Toxoplasma gondiiMutation(s): 0 
Gene Names: CPL
Find proteins for Q6DMN0 (Toxoplasma gondii)
Go to UniProtKB:  Q6DMN0
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cathepsin L Propeptide
P
106Toxoplasma gondiiMutation(s): 0 
Gene Names: CPL
Find proteins for Q6DMN0 (Toxoplasma gondii)
Go to UniProtKB:  Q6DMN0
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
BR
Query on BR

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Download CCD File 
P
BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
P
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.165 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 65.621α = 90.00
b = 65.621β = 90.00
c = 149.772γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
REFMACrefinement
SCALEPACKdata scaling
HKL-2000data reduction
PHASERphasing
DENZOdata reduction
HKL-2000data scaling
Blu-Icedata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-11-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Source and taxonomy, Version format compliance
  • Version 1.2: 2013-07-31
    Type: Non-polymer description
  • Version 1.3: 2017-10-25
    Type: Refinement description