5GDS

HIRUNORMS ARE TRUE HIRUDIN MIMETICS. THE CRYSTAL STRUCTURE OF HUMAN ALPHA-THROMBIN:HIRUNORM V COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Hirunorms are true hirudin mimetics. The crystal structure of human alpha-thrombin-hirunorm V complex.

De Simone, G.Lombardi, A.Galdiero, S.Nastri, F.Della Morte, R.Staiano, N.Pedone, C.Bolognesi, M.Pavone, V.

(1998) Protein Sci. 7: 243-253

  • DOI: 10.1002/pro.5560070203

  • PubMed Abstract: 
  • A novel class of synthetic, multisite-directed thrombin inhibitors, known as hirunorms, has been described recently. These compounds were designed to mimic the binding mode of hirudin, and they have been proven to be very strong and selective thrombi ...

    A novel class of synthetic, multisite-directed thrombin inhibitors, known as hirunorms, has been described recently. These compounds were designed to mimic the binding mode of hirudin, and they have been proven to be very strong and selective thrombin inhibitors. Here we report the crystal structure of the complex formed by human alpha-thrombin and hirunorm V, a 26-residue polypeptide containing non-natural amino acids, determined at 2.1 A resolution and refined to an R-factor of 0.176. The structure reveals that the inhibitor binding mode is distinctive of a true hirudin mimetic, and it highlights the molecular basis of the high inhibitory potency (Ki is in the picomolar range) and the strong selectivity of hirunorm V. Hirunorm V interacts through the N-terminal tetrapeptide with the thrombin active site in a nonsubstrate mode; at the same time, this inhibitor specifically binds through the C-terminal segment to the fibrinogen recognition exosite. The backbone of the N-terminal tetrapeptide Chg1"-Val2"-2-Nal3"-Thr4" (Chg, cyclohexyl-glycine; 2-Nal, beta-(2-naphthyl)-alanine) forms a short beta-strand parallel to thrombin main-chain residues Ser214-Gly219. The Chg1" side chain fills the S2 subsite, Val2" is located at the entrance of S1, whereas 2-Nal3" side chain occupies the aryl-binding site. Such backbone orientation is very close to that observed for the N-terminal residues of hirudin, and it is similar to that of the synthetic retro-binding peptide BMS-183507, but it is opposite to the proposed binding mode of fibrinogen and of small synthetic substrates. Hirunorm V C-terminal segment binds to the fibrinogen recognition exosite, similarly to what observed for hirudin C-termninal tail and related compounds. The linker polypeptide segment connecting hirunorm V N-and C-terminal regions is not observable in the electron density maps. The crystallographic analysis proves the correctness of the design and it provides a compelling proof on the interaction mechanism for this novel class of high potency multisite-directed synthetic thrombin inhibitors.


    Related Citations: 
    • Rational Design of True Hirudin Mimetics: Synthesis and Characterization of Multisite-Directed Alpha-Thrombin Inhibitors
      Lombardi, A.,Nastri, F.,Della Morte, R.,Rossi, A.,De Rosa, A.,Staiano, N.,Pedone, C.,Pavone, V.
      (1996) J.Med.Chem. 39: 2008
    • Refined Structure of the Hirudin-Thrombin Complex
      Rydel, T.J.,Tulinsky, A.,Bode, W.,Huber, R.
      (1991) J.Mol.Biol. 221: 583


    Organizational Affiliation

    Centro Interuniversitario di Ricerca su Peptidi Bioattivi, & Centro di Studio di Biocristallografia-CNR, University of Napoli Federico II, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-THROMBIN
L
36Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to Gene View: F2
Go to UniProtKB:  P00734
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ALPHA-THROMBIN
H
259Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to Gene View: F2
Go to UniProtKB:  P00734
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
HIRUNORM V
I
26N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
H
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  8 Unique
IDChainsTypeFormula2D DiagramParent
BAL
Query on BAL
I
peptide-likeC3 H7 N O2

--

NAL
Query on NAL
I
L-PEPTIDE LINKINGC13 H13 N O2ALA
HMF
Query on HMF
I
D-PEPTIDE LINKINGC10 H13 N O2

--

ALC
Query on ALC
I
L-PEPTIDE LINKINGC9 H17 N O2ALA
DGL
Query on DGL
I
D-PEPTIDE LINKINGC5 H9 N O4

--

AIB
Query on AIB
I
L-PEPTIDE LINKINGC4 H9 N O2ALA
DAL
Query on DAL
I
D-PEPTIDE LINKINGC3 H7 N O2

--

CHG
Query on CHG
I
L-PEPTIDE LINKINGC8 H15 N O2

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.176 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 71.900α = 90.00
b = 72.800β = 100.70
c = 73.300γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
CCP4data reduction
MOSFLMdata reduction
CCP4model building
TNTrefinement
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-01-21
    Type: Initial release
  • Version 1.1: 2008-03-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance