1NQC

Crystal structures of Cathepsin S inhibitor complexes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Specificity determinants of human cathepsin s revealed by crystal structures of complexes.

Pauly, T.A.Sulea, T.Ammirati, M.Sivaraman, J.Danley, D.E.Griffor, M.C.Kamath, A.V.Wang, I.K.Laird, E.R.Seddon, A.P.Menard, R.Cygler, M.Rath, V.L.

(2003) Biochemistry 42: 3203-3213

  • DOI: 10.1021/bi027308i
  • Primary Citation of Related Structures:  
  • Also Cited By: 2C0Y

  • PubMed Abstract: 
  • Cathepsin S, a lysosomal cysteine protease of the papain superfamily, has been implicated in the preparation of MHC class II alphabeta-heterodimers for antigen presentation to CD4+ T lymphocytes and is considered a potential target for autoimmune-dis ...

    Cathepsin S, a lysosomal cysteine protease of the papain superfamily, has been implicated in the preparation of MHC class II alphabeta-heterodimers for antigen presentation to CD4+ T lymphocytes and is considered a potential target for autoimmune-disease therapy. Selective inhibition of this enzyme may be therapeutically useful for attenuating the hyperimmune responses in a number of disorders. We determined the three-dimensional crystal structures of human cathepsin S in complex with potent covalent inhibitors, the aldehyde inhibitor 4-morpholinecarbonyl-Phe-(S-benzyl)Cys-Psi(CH=O), and the vinyl sulfone irreversible inhibitor 4-morpholinecarbonyl-Leu-Hph-Psi(CH=CH-SO(2)-phenyl) at resolutions of 1.8 and 2.0 A, respectively. In the structure of the cathepsin S-aldehyde complex, the tetrahedral thiohemiacetal adduct favors the S-configuration, in which the oxygen atom interacts with the imidazole group of the active site His164 rather than with the oxyanion hole. The present structures provide a detailed map of noncovalent intermolecular interactions established in the substrate-binding subsites S3 to S1' of cathepsin S. In the S2 pocket, which is the binding affinity hot spot of cathepsin S, the Phe211 side chain can assume two stable conformations that accommodate either the P2-Leu or a bulkier P2-Phe side chain. This structural plasticity of the S2 pocket in cathepsin S explains the selective inhibition of cathepsin S over cathepsin K afforded by inhibitors with the P2-Phe side chain. Comparison with the structures of cathepsins K, V, and L allows delineation of local intermolecular contacts that are unique to cathepsin S.


    Organizational Affiliation

    Exploratory Medicinal Sciences and Computational Chemistry, Groton Laboratories, Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cathepsin S
A
217Homo sapiensMutation(s): 0 
Gene Names: CTSS
EC: 3.4.22.27
Find proteins for P25774 (Homo sapiens)
Go to Gene View: CTSS
Go to UniProtKB:  P25774
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C4P
Query on C4P

Download SDF File 
Download CCD File 
A
N-[(1R)-2-(BENZYLSULFANYL)-1-FORMYLETHYL]-N-(MORPHOLIN-4-YLCARBONYL)-L-PHENYLALANINAMIDE
MORPHOLINE-4-CARBOXYLIC ACID [1-(2-BENZYLSULFANYL-1-FORMYL-ETHYLCARBAMOYL)-2-PHENYL-ETHYL]-AMIDE
C24 H29 N3 O4 S
MWTQNXVXPLTHJB-YADHBBJMSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
C4PKi: 50 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 36.900α = 90.00
b = 76.500β = 90.00
c = 101.900γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
SCALEPACKdata scaling
CNSrefinement
Adxvdata processing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description