1AIM

CRUZAIN INHIBITED BY BENZOYL-TYROSINE-ALANINE-FLUOROMETHYLKETONE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.247 
  • R-Value Work: 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:  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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CRUZAIN
A
215Trypanosoma cruziEC: 3.4.22.51
Find proteins for P25779 (Trypanosoma cruzi)
Go to UniProtKB:  P25779
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZYA
Query on ZYA

Download SDF File 
Download CCD File 
A
BENZOYL-TYROSINE-ALANINE-FLUORO-METHYL KETONE
Nalpha-[(benzyloxy)carbonyl]-N-[(2S)-4-fluoro-3-oxobutan-2-yl]-L-tyrosinamide
C21 H23 F N2 O5
RYABQRLJLIHDIP-KSSFIOAISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 43.250α = 90.00
b = 51.620β = 115.43
c = 45.340γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
SCALEPACKdata scaling
DENZOdata reduction
X-PLORphasing
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-10-22
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance