4HFP

Structure of thrombin mutant S195a bound to the active site inhibitor argatroban


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Autoactivation of thrombin precursors.

Pozzi, N.Chen, Z.Zapata, F.Niu, W.Barranco-Medina, S.Pelc, L.A.Di Cera, E.

(2013) J Biol Chem 288: 11601-11610

  • DOI: 10.1074/jbc.M113.451542
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Trypsin-like proteases are synthesized as inactive zymogens and convert to the mature form upon activation by specific enzymes, often assisted by cofactors. Central to this paradigm is that the zymogen does not convert spontaneously to the mature enz ...

    Trypsin-like proteases are synthesized as inactive zymogens and convert to the mature form upon activation by specific enzymes, often assisted by cofactors. Central to this paradigm is that the zymogen does not convert spontaneously to the mature enzyme, which in turn does not feed back to activate its zymogen form. In the blood, the zymogens prothrombin and prethrombin-2 require the prothrombinase complex to be converted to the mature protease thrombin, which is unable to activate prothrombin or prethrombin-2. Here, we show that replacement of key residues within the activation domain causes these zymogens to spontaneously convert to thrombin. The conversion is started by the zymogen itself, which is capable of binding ligands at the active site, and is abrogated by inactivation of the catalytic residue Ser-195. The product of autoactivation is functionally and structurally equivalent to wild-type thrombin. Zymogen autoactivation is explained by conformational selection, a basic property of the trypsin fold uncovered by structural and rapid kinetics studies. Both the zymogen and protease undergo a pre-existing equilibrium between active and inactive forms. The equilibrium regulates catalytic activity in the protease and has the potential to unleash activity in the zymogen to produce autoactivation. A new strategy emerges for the facile production of enzymes through zymogen autoactivation that is broadly applicable to trypsin-like proteases of biotechnological and clinical interest.


    Organizational Affiliation

    Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, Missouri 63104, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Prothrombin
A, C
31Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS  P00734
Protein Feature View
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Prothrombin
B, D
259Homo sapiensMutation(s): 1 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS  P00734
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
15U
Query on 15U

Download CCD File 
B, D
(2R,4R)-4-methyl-1-(N~2~-{[(3S)-3-methyl-1,2,3,4-tetrahydroquinolin-8-yl]sulfonyl}-L-arginyl)piperidine-2-carboxylic acid
C23 H36 N6 O5 S
KXNPVXPOPUZYGB-MXSMSXNCSA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
B, D
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000889 (15U)
Query on PRD_000889
B, DS-argatrobanPeptide-like /  Inhibitor

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External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
15UKd:  42   nM  Binding MOAD
15UKd :  42   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.170 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.229α = 90
b = 77.229β = 90
c = 94.875γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-13
    Type: Initial release
  • Version 1.1: 2013-04-10
    Changes: Other
  • Version 1.2: 2013-05-22
    Changes: Database references