1AIM

CRUZAIN INHIBITED BY BENZOYL-TYROSINE-ALANINE-FLUOROMETHYLKETONE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.188 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural determinants of specificity in the cysteine protease cruzain.

Gillmor, S.A.Craik, C.S.Fletterick, R.J.

(1997) Protein Sci 6: 1603-1611

  • DOI: 10.1002/pro.5560060801
  • Primary Citation of Related Structures:  
    1AIM, 2AIM

  • PubMed Abstract: 
  • The structure of cruzain, an essential protease from the parasite Trypanosoma cruzi, was determined by X-ray crystallography bound to two different covalent inhibitors. The cruzain S2 specificity pocket is able to productively bind both arginine and phenylalanine residues ...

    The structure of cruzain, an essential protease from the parasite Trypanosoma cruzi, was determined by X-ray crystallography bound to two different covalent inhibitors. The cruzain S2 specificity pocket is able to productively bind both arginine and phenylalanine residues. The structures of cruzain bound to benzoyl-Arg-Ala-fluoromethyl ketone and benzoyl-Tyr-Ala-fluoromethyl ketone at 2.2 and 2.1 A, respectively, show a pH-dependent specificity switch. Glu 205 adjusts to restructure the S2 specificity pocket, conferring right binding to both hydrophobic and basic residues. Kinetic analysis of activated peptide substrates shows that substrates placing hydrophobic residues in the specificity pocket are cleaved at a broader pH range than hydrophilic substrates. These results demonstrate how cruzain binds both basic and hydrophobic residues and could be important for in vivo regulation of cruzain activity.


    Related Citations: 
    • The Crystal Structure of Cruzain: A Therapeutic Target for Chagas' Disease
      Mcgrath, M.E., Eakin, A.E., Engel, J.C., Mckerrow, J.H., Craik, C.S., Fletterick, R.J.
      (1995) J Mol Biol 247: 251

    Organizational Affiliation

    Graduate Group in Biophysics, University of California, San Francisco 94143-0448, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CRUZAINA215Trypanosoma cruziMutation(s): 0 
Gene Names: RTP
EC: 3.4.22 (PDB Primary Data), 3.4.22.51 (UniProt)
UniProt
Find proteins for P25779 (Trypanosoma cruzi)
Explore P25779 
Go to UniProtKB:  P25779
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZYA (Subject of Investigation/LOI)
Query on ZYA

Download Ideal Coordinates CCD File 
B [auth A]BENZOYL-TYROSINE-ALANINE-FLUORO-METHYL KETONE
C21 H23 F N2 O5
RYABQRLJLIHDIP-KSSFIOAISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.25α = 90
b = 51.62β = 115.43
c = 45.34γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-10-22
    Type: Initial release
  • Version 1.1: 2008-03-24
    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