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THE CRYSTAL STRUCTURE OF ANIONIC SALMON TRYPSIN IN COMPLEX WITH BOVINE PANCREATIC TRYPSIN INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of anionic salmon trypsin in complex with bovine pancreatic trypsin inhibitor.

Helland, R.Leiros, I.Berglund, G.I.Willassen, N.P.Smalas, A.O.

(1998) Eur.J.Biochem. 256: 317-324


  • PubMed Abstract: 
  • The complex formed between anionic salmon trypsin (ST) and bovine pancreatic trypsin inhibitor (BPTI) has been crystallised, and the X-ray structure has been solved using the molecular replacement method. The crystals are hexagonal and belong to spac ...

    The complex formed between anionic salmon trypsin (ST) and bovine pancreatic trypsin inhibitor (BPTI) has been crystallised, and the X-ray structure has been solved using the molecular replacement method. The crystals are hexagonal and belong to space group P6(1)22 with lattice parameters of a = b = 83.12 A and c = 222.15 A. Data have been collected to 2.1 A and the structure has been refined to a crystallographic R-factor of 20.6%. Catalysis by salmon trypsin is distinguished by a Km value 20-fold lower than that for mammalian trypsins, and a k(cat) twice as high. The present ST-BPTI complex serves as a model for the Michaelis-Menten complex, and has been compared with corresponding bovine and rat trypsin (RT) complexes. The binding of BPTI to salmon trypsin is characterised by stronger primary interactions in the active site, and a somewhat looser secondary binding.


    Organizational Affiliation

    Department of Chemistry, University of Tromsø, Norway.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (TRYPSIN)
E
222Salmo salarMutation(s): 0 
EC: 3.4.21.4
Find proteins for P35031 (Salmo salar)
Go to UniProtKB:  P35031
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (BOVINE PANCREATIC TRYPSIN INHIBITOR)
I
58Bos taurusMutation(s): 0 
Find proteins for P00974 (Bos taurus)
Go to UniProtKB:  P00974
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.206 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 84.120α = 90.00
b = 84.120β = 90.00
c = 222.150γ = 120.00
Software Package:
Software NamePurpose
X-PLORmodel building
CCP4data scaling
X-PLORrefinement
X-PLORphasing
CCP4data reduction
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance