2C34

Leishmania mexicana ICP


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 38 
  • Selection Criteria: LOWEST RESTRAINT ENERGY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Structure of Leishmania Mexicana Icp Provides Evidence for Convergent Evolution of Cysteine Peptidase Inhibitors.

Smith, B.O.Picken, N.C.Westrop, G.D.Bromek, K.Mottram, J.C.Coombs, G.H.

(2006) J.Biol.Chem. 281: 5821

  • DOI: 10.1074/jbc.M510868200

  • PubMed Abstract: 
  • Clan CA, family C1 cysteine peptidases (CPs) are important virulence factors and drug targets in parasites that cause neglected diseases. Natural CP inhibitors of the I42 family, known as ICP, occur in some protozoa and bacterial pathogens but are ab ...

    Clan CA, family C1 cysteine peptidases (CPs) are important virulence factors and drug targets in parasites that cause neglected diseases. Natural CP inhibitors of the I42 family, known as ICP, occur in some protozoa and bacterial pathogens but are absent from metazoa. They are active against both parasite and mammalian CPs, despite having no sequence similarity with other classes of CP inhibitor. Recent data suggest that Leishmania mexicana ICP plays an important role in host-parasite interactions. We have now solved the structure of ICP from L. mexicana by NMR and shown that it adopts a type of immunoglobulin-like fold not previously reported in lower eukaryotes or bacteria. The structure places three loops containing highly conserved residues at one end of the molecule, one loop being highly mobile. Interaction studies with CPs confirm the importance of these loops for the interaction between ICP and CPs and suggest the mechanism of inhibition. Structure-guided mutagenesis of ICP has revealed that residues in the mobile loop are critical for CP inhibition. Data-driven docking models support the importance of the loops in the ICP-CP interaction. This study provides structural evidence for the convergent evolution from an immunoglobulin fold of CP inhibitors with a cystatin-like mechanism.


    Organizational Affiliation

    Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK. b.smith@bio.gla.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INHIBITOR OF CYSTEINE PEPTIDASES
A
116Leishmania mexicanaMutation(s): 0 
Gene Names: icp
Find proteins for Q868H1 (Leishmania mexicana)
Go to UniProtKB:  Q868H1
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 38 
  • Selection Criteria: LOWEST RESTRAINT ENERGY 
  • Olderado: 2C34 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-12-21
    Type: Initial release
  • Version 1.1: 2011-05-07
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance