1RTF

COMPLEX OF BENZAMIDINE WITH THE CATALYTIC DOMAIN OF HUMAN TWO CHAIN TISSUE PLASMINOGEN ACTIVATOR [(TC)-T-PA]


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The 2.3 A crystal structure of the catalytic domain of recombinant two-chain human tissue-type plasminogen activator

Lamba, D.Bauer, M.Huber, R.Fischer, S.Rudolph, R.Kohnert, U.Bode, W.

(1996) J.Mol.Biol. 258: 117-135

  • DOI: 10.1006/jmbi.1996.0238

  • PubMed Abstract: 
  • Tissue-type plasminogen activator (t-PA), a multidomainal serine proteinase of the trypsin-family, catalyses the rate-limiting step in fibrinolysis, the activation of plasminogen to the fibrin-degrading proteinase plasmin. Trigonal crystals have been ...

    Tissue-type plasminogen activator (t-PA), a multidomainal serine proteinase of the trypsin-family, catalyses the rate-limiting step in fibrinolysis, the activation of plasminogen to the fibrin-degrading proteinase plasmin. Trigonal crystals have been obtained of the recombinant catalytic domain of human-two-chain t-PA, consisting of a 17 residue A chain and the 252 residue B chain. Its X-ray crystal structure has been solved applying Patterson and isomorphous replacement methods, and has been crystallographically refined to an R-value of 0.184 at 2.3 A resolution. The chain fold, active-site geometry and Ile276-Asp477 salt bridge are similar to that observed for trypsin. A few surface-located insertion loops differ significantly, however. The disulfide bridge Cys315-Cys384, practically unique to the plasminogen activators, is incorporated without drastic conformational changes as the insertion loop preceding Cys384 makes a bulge on the molecular surface. The unique basic insertion loop Lys296-Arg304 flanking the primed subsites, which has been shown to be of importance for PAI-1 binding and for fibrin specificity, is partially disordered; it can therefore freely adapt to proteins docking to the active site. The S1 pocket of t-PA is almost identical to that of trypsin, whereas the S2 site is considerably reduced in size by the imposing Tyr368 side-chain, in agreement with the measured preference for P1 Arg and P2 Gly residues. The neighbouring S3-S4 hydrophobic groove is mainly hydrophobic in nature. The structure of the proteinase domain of two-chain t-PA suggests that the formation of a salt bridge between Lys429 and Asp477 may contribute to the unusually high catalytic activity of single-chain t-PA, thus stabilizing the catalytically active conformation without unmasking the Ile276 amino terminus. Modeling studies show that the covalently bound kringle 2 domain in full-length t-PA could interact with an extended hydrophobic groove in the catalytic domain; in such a docking geometry its "lysine binding site" and the "fibrin binding patch" of the catalytic domain are in close proximity.


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Martinsried, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TWO CHAIN TISSUE PLASMINOGEN ACTIVATOR
A
17N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TWO CHAIN TISSUE PLASMINOGEN ACTIVATOR
B
252Homo sapiensMutation(s): 0 
Gene Names: PLAT
EC: 3.4.21.68
Find proteins for P00750 (Homo sapiens)
Go to Gene View: PLAT
Go to UniProtKB:  P00750
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
BEN
Query on BEN

Download SDF File 
Download CCD File 
B
BENZAMIDINE
C7 H8 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BENKi: 910000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.184 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 59.200α = 90.00
b = 59.200β = 90.00
c = 136.330γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
X-PLORmodel building
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1995-11-10 
  • Released Date: 1997-01-11 
  • Deposition Author(s): Bode, W., Lamba, D.

Revision History 

  • Version 1.0: 1997-01-11
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance