1BRB

CRYSTAL STRUCTURES OF RAT ANIONIC TRYPSIN COMPLEXED WITH THE PROTEIN INHIBITORS APPI AND BPTI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.198 

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This is version 1.3 of the entry. See complete history

Literature

Crystal structures of rat anionic trypsin complexed with the protein inhibitors APPI and BPTI.

Perona, J.J.Tsu, C.A.Craik, C.S.Fletterick, R.J.

(1993) J.Mol.Biol. 230: 919-933


  • PubMed Abstract: 
  • The crystal structure of rat anionic trypsin D189G/G226D has been determined in complexes with each of the protein inhibitors APPI (amyloid beta-protein precursor inhibitor domain) and BPTI (bovine pancreatic trypsin inhibitor) at resolutions of 2.5 ...

    The crystal structure of rat anionic trypsin D189G/G226D has been determined in complexes with each of the protein inhibitors APPI (amyloid beta-protein precursor inhibitor domain) and BPTI (bovine pancreatic trypsin inhibitor) at resolutions of 2.5 A and 2.1 A, respectively. Comparisons with the structure of the bovine trypsin-BPTI complex show that the enzyme-inhibitor interactions in rat trypsin are dominated to a much greater degree by attractive and repulsive electrostatic forces. Decreased structural complementarity in the flanking regions of the interface formed with BPTI is reflected in significantly weaker inhibition relative to bovine trypsin. The primary active site loop of BPTI adopts slightly different conformations when bound to rat and cow trypsins, reflecting a broader entrance to the binding pocket in the former. Tight complementarity of each loop conformer to the respective active sites then gives rise to significantly different overall orientations of the inhibitor when bound to the two enzymes. The crystal structures of trypsin bound to these protein inhibitors are excellent models of the Michaelis complexes, which permit visualization of substrate interactions both N and C-terminal to the cleaved bond, while maintaining identical reaction chemistry. They will be uniquely useful to the structure-function analysis of variant rat trypsin enzymes.


    Related Citations: 
    • Relocating a Negative Charge in the Binding Pocket of Trypsin
      Perona, J.J.,Tsu, C.A.,Mcgrath, M.E.,Craik, C.S.,Fletterick, R.J.
      (1993) J.Mol.Biol. 230: 934


    Organizational Affiliation

    Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-0446.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN
E
223Rattus norvegicusGene Names: Prss2 (Try2)
EC: 3.4.21.4
Find proteins for P00763 (Rattus norvegicus)
Go to UniProtKB:  P00763
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PANCREATIC TRYPSIN INHIBITOR
I
58Bos taurus
Find proteins for P00974 (Bos taurus)
Go to UniProtKB:  P00974
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.198 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 92.650α = 90.00
b = 92.650β = 90.00
c = 62.320γ = 120.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-07-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other