3AAV

Bovine beta-trypsin bound to meta-diamidino schiff base copper (II) chelate

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.183 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural basis for the design of novel Schiff base metal chelate inhibitors of trypsin

Iyaguchi, D., Kawano, S., Takada, K., Toyota, E.

(2010) Bioorg Med Chem 18: 2076-2080

  • DOI: 10.1016/j.bmc.2010.02.016
  • Primary Citation of Related Structures:  
    3AAS, 3AAU, 3AAV

  • PubMed Abstract: 

    • The crystal structures of the complexes of bovine trypsin with m-guanidinosalicylidene-l-alaninato(aqua)copper(II) hydrochloride (inhibitor 1), [N,N'-bis(m-guanidinosalicylidene)ethylenediaminato]copper(II) (inhibitor 2), and [N,N'-bis(m-amidinosalicylidene)ethylenediaminato]copper(II) (inhibitor 4) have been determined ...

    The crystal structures of the complexes of bovine trypsin with m-guanidinosalicylidene-l-alaninato(aqua)copper(II) hydrochloride (inhibitor 1), [N,N'-bis(m-guanidinosalicylidene)ethylenediaminato]copper(II) (inhibitor 2), and [N,N'-bis(m-amidinosalicylidene)ethylenediaminato]copper(II) (inhibitor 4) have been determined. The guanidine-containing trypsin-inhibitors (1 and 2) bind to the trypsin active site in a manner similar to that previously reported for amidine-containing inhibitors, for example, m-amidinosalicylidene-l-alaninato(aqua)copper(II) hydrochloride (inhibitor 3). However, the binding mode of the guanidino groups of inhibitors 1 and 2 to Asp189 in the S1 pocket of trypsin was found to be markedly different from that of the amidino group of inhibitor 3. The present X-ray analyses revealed that the interactions of the metal ion of the inhibitors with the active site residues of trypsin play a crucial role in the binding affinity to the trypsin molecule. These structural information and inhibitory activity data for amidine- and guanidine-containing Schiff base metal chelate inhibitors provide new avenues for designing novel inhibitors against physiologically important trypsin-like serine proteases.

    Organizational Affiliation: 

    Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cationic trypsinA, B223Bos taurusMutation(s): 0 
EC: 3.4.21.4
UniProt
Find proteins for P00760 (Bos taurus)
Explore P00760 
Go to UniProtKB:  P00760
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A2C (Subject of Investigation/LOI)
Query on A2C
Download Ideal Coordinates CCD File 
C [auth A], F [auth B]3,3'-[ethane-1,2-diylbis(nitrilomethylylidene)]bis(4-hydroxybenzenecarboximidamide)
C18 H20 N6 O2
YUJGWDWOHQDFJV-UHFFFAOYSA-N		 Ligand Interaction
CU
Query on CU
Download Ideal Coordinates CCD File 
E [auth A], H [auth B]COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
D [auth A], G [auth B]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
A2C PDBBind:  3AAV Ki: 240 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.183 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.568α = 90
b = 54.568β = 90
c = 107.235γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
AMoREphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance