3UIR

Crystal structure of the plasmin-textilinin-1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.777 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structure of human microplasmin in complex with textilinin-1, an aprotinin-like inhibitor from the Australian brown snake.

Millers, E.K.Johnson, L.A.Birrell, G.W.Masci, P.P.Lavin, M.F.de Jersey, J.Guddat, L.W.

(2013) Plos One 8: e54104-e54104

  • DOI: 10.1371/journal.pone.0054104

  • PubMed Abstract: 
  • Textilinin-1 is a Kunitz-type serine protease inhibitor from Australian brown snake venom. Its ability to potently and specifically inhibit human plasmin (K(i) = 0.44 nM) makes it a potential therapeutic drug as a systemic anti-bleeding agent. The cr ...

    Textilinin-1 is a Kunitz-type serine protease inhibitor from Australian brown snake venom. Its ability to potently and specifically inhibit human plasmin (K(i) = 0.44 nM) makes it a potential therapeutic drug as a systemic anti-bleeding agent. The crystal structures of the human microplasmin-textilinin-1 and the trypsin-textilinin-1 complexes have been determined to 2.78 Å and 1.64 Å resolution respectively, and show that textilinin-1 binds to trypsin in a canonical mode but to microplasmin in an atypical mode with the catalytic histidine of microplasmin rotated out of the active site. The space vacated by the histidine side-chain in this complex is partially occupied by a water molecule. In the structure of microplasminogen the χ(1) dihedral angle of the side-chain of the catalytic histidine is rotated by 67° from its "active" position in the catalytic triad, as exemplified by its location when microplasmin is bound to streptokinase. However, when textilinin-1 binds to microplasmin the χ(1) dihedral angle of this amino acid residue changes by -157° (i.e. in the opposite rotation direction compared to microplasminogen). The unusual mode of interaction between textilinin-1 and plasmin explains textilinin-1's selectivity for human plasmin over plasma kallikrein. This difference can be exploited in future drug design efforts.


    Organizational Affiliation

    School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Plasmin light chain B
A, B
247Homo sapiensMutation(s): 0 
Gene Names: PLG
EC: 3.4.21.7
Find proteins for P00747 (Homo sapiens)
Go to Gene View: PLG
Go to UniProtKB:  P00747
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Textilinin-1
C, D
59Pseudonaja textilis textilisMutation(s): 0 
Find proteins for Q90WA1 (Pseudonaja textilis textilis)
Go to UniProtKB:  Q90WA1
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
B, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.777 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 81.901α = 90.00
b = 48.019β = 102.08
c = 82.627γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
EPMRphasing
CrystalCleardata scaling
CrystalCleardata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-12-26
    Type: Initial release
  • Version 1.1: 2013-07-17
    Type: Database references