1AY6

THROMBIN INHIBITOR FROM THEONALLA, CYCLOTHEANAMIDE-BASED MACROCYCLIC TRIPEPTIDE MOTIF


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Novel thrombin inhibitors that are based on a macrocyclic tripeptide motif

Greco, M.N.Powell, E.T.Hecker, L.R.Andrade-Gordon, P.Kauffman, J.A.Lewis, J.M.Ganesh, V.Tulinsky, A.Maryanoff, B.E.

(1996) Bioorg.Med.Chem.Lett. 6: 2947-2952

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The macrocyclic peptide cyclotheonamide A (CtA), isolated from the marine sponge Theonella sp., represents an unusual class of serine protease inhibitor. A complex of this inhibitor with human alpha-thrombin, a protease central to the bioregulation o ...

    The macrocyclic peptide cyclotheonamide A (CtA), isolated from the marine sponge Theonella sp., represents an unusual class of serine protease inhibitor. A complex of this inhibitor with human alpha-thrombin, a protease central to the bioregulation of thrombosis and hemostasis, was studied by x-ray crystallography. This work (2.3-A resolution) confirms the structure of CtA and reveals intimate details about its molecular recognition within the enzyme active site. Interactions due to the "Pro-Arg motif" (Arg occupancy of the S1 specificity pocket; formation of a hydrogen-bonded two-strand antiparallel beta-sheet with Ser214-Gly216) and the alpha-keto amide group of CtA are primarily responsible for binding to thrombin, with the alpha-keto amide serving as a transition-state analogue. A special interaction with the "insertion loop" of thrombin (Tyr60A-Thr60I) is manifested through engagement of the hydroxyphenyl group of CtA with Trp60D as part of an "aromatic stacking chain." Biochemical inhibition data (Ki values at 37 degrees C) were obtained for CtA with thrombin and a diverse collection of serine proteases. Thus, CtA is just a moderate inhibitor of human alpha-thrombin (Ki = 0.18 microM) but a potent inhibitor of trypsin (Ki = 0.023 microM) and streptokinase (Ki = 0.035 microM). The relative lack of potency of CtA as a thrombin inhibitor is discussed with respect to certain structural features of the enzyme complex. We also report the total synthesis of CtA, by a convergent [2 + 3] fragment-condensation approach, to serve the preparation of cyclotheonamide analogues for structure-function studies.


    Organizational Affiliation

    Drug Discovery Division, R. W. Johnson Pharmaceutical Research Institute, Spring House, PA 19477.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THROMBIN LIGHT CHAIN
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
THROMBIN HEAVY CHAIN
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
HIRUGEN
I
13Hirudo medicinalisMutation(s): 0 
Find proteins for P01050 (Hirudo medicinalis)
Go to UniProtKB:  P01050
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1ZV
Query on 1ZV

Download SDF File 
Download CCD File 
H
amino({3-[(3R,5R,14S,16S,21aR)-5,14-dihydroxy-1,4,17-trioxo-16-(2-phenylethyl)icosahydro-1H-pyrrolo[1,2-d][1,4,7,11]tetraazacyclononadecin-3-yl]propyl}amino)methaniminium
C30 H50 N7 O5
SNOALCJXRGNTNQ-VDKCFFHZSA-O
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
TYS
Query on TYS
I
L-PEPTIDE LINKINGC9 H11 N O6 STYR
ACE
Query on ACE
I
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.166 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 71.080α = 90.00
b = 72.140β = 100.80
c = 72.820γ = 90.00
Software Package:
Software NamePurpose
R-AXISdata reduction
X-PLORphasing
X-PLORmodel building
R-AXISdata collection
PROLSQrefinement
X-PLORrefinement
R-AXISdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-03-18
    Type: Initial release
  • Version 1.1: 2008-03-24
    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
  • Version 1.3: 2012-12-12
    Type: Other