1XUH

TRYPSIN-KETO-BABIM-CO+2, PH 8.2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.135 
  • R-Value Observed: 0.135 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Design of potent selective zinc-mediated serine protease inhibitors.

Katz, B.A.Clark, J.M.Finer-Moore, J.S.Jenkins, T.E.Johnson, C.R.Ross, M.J.Luong, C.Moore, W.R.Stroud, R.M.

(1998) Nature 391: 608-612

  • DOI: 10.1038/35422
  • Primary Citation of Related Structures:  
    1XUK, 1XUJ, 1XUI, 1XUH, 1XUG, 1XUF, 1C2G, 1C2F, 1C2E, 1C2D

  • PubMed Abstract: 
  • Many serine proteases are targets for therapeutic intervention because they often play key roles in disease. Small molecule inhibitors of serine proteases with high affinity are especially interesting as they could be used as scaffolds from which to ...

    Many serine proteases are targets for therapeutic intervention because they often play key roles in disease. Small molecule inhibitors of serine proteases with high affinity are especially interesting as they could be used as scaffolds from which to develop drugs selective for protease targets. One such inhibitor is bis(5-amidino-2-benzimidazolyl)methane (BABIM), standing out as the best inhibitor of trypsin (by a factor of over 100) in a series of over 60 relatively closely related analogues. By probing the structural basis of inhibition, we discovered, using crystallographic methods, a new mode of high-affinity binding in which a Zn2+ ion is tetrahedrally coordinated between two chelating nitrogens of BABIM and two active site residues, His57 and Ser 195. Zn2+, at subphysiological levels, enhances inhibition by over 10(3)-fold. The distinct Zn2+ coordination geometry implies a strong dependence of affinity on substituents. This unique structural paradigm has enabled development of potent, highly selective, Zn2+-dependent inhibitors of several therapeutically important serine proteases, using a physiologically ubiquitous metal ion.


    Organizational Affiliation

    Arris Pharmaceutical Corporation, South San Francisco, California 94080, USA. bak@arris.com



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSINA223Bos taurusMutation(s): 0 
EC: 3.4.21.4
Find proteins for P00760 (Bos taurus)
Explore P00760 
Go to UniProtKB:  P00760
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BAO
Query on BAO

Download CCD File 
A
BIS(5-AMIDINO-2-BENZIMIDAZOLYL)METHANONE
C17 H14 N8 O
VVVXDHROXQUONB-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CO
Query on CO

Download CCD File 
A
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.135 
  • R-Value Observed: 0.135 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.99α = 90
b = 54.99β = 90
c = 109.63γ = 120
Software Package:
Software NamePurpose
SADIEdata collection
SAINTdata scaling
X-PLORmodel building
X-PLORrefinement
SADIEdata reduction
SAINTdata reduction
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Version format compliance