1EB1

Complex structure of human thrombin with N-methyl-arginine inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

The Methyl Group of N(Alpha)(Me)Arg-Containing Peptides Disturbs the Active-Site Geometry of Thrombin, Impairing Efficient Cleavage

Friedrich, R.Steinmetzer, T.Huber, R.Sturzebecher, J.Bode, W.

(2002) J Mol Biol 316: 869

  • DOI: 10.1006/jmbi.2001.5394
  • Primary Citation of Related Structures:  
    1EB1

  • PubMed Abstract: 
  • Bivalent peptidic thrombin inhibitors consisting of an N-terminal d-cyclohexylalanine-Pro-N(alpha)(Me)Arg active-site fragment, a flexible polyglycine linker, and a C-terminal hirugen-like segment directed towards the fibrinogen recognition exosite inhib ...

    Bivalent peptidic thrombin inhibitors consisting of an N-terminal d-cyclohexylalanine-Pro-N(alpha)(Me)Arg active-site fragment, a flexible polyglycine linker, and a C-terminal hirugen-like segment directed towards the fibrinogen recognition exosite inhibit thrombin with K(i) values in the picomolar range, remaining stable in buffered solution at pH 7.8 for at least 15 hours. In order to investigate the structural basis of this increased stability, the most potent of these inhibitors, I-11 (K(i)=37pM), containing an N(alpha)(Me)Arg-Thr bond, was crystallized in complex with human alpha-thrombin. X-ray data were collected to 1.8A resolution and the crystal structure of this complex was determined. The Fourier map displays clear electron density for the N-terminal fragment and for the exosite binding segment. It indicates, however, that in agreement with Edman sequencing, the peptide had been cleaved in the crystal, presumably due to the long incubation time of 14 days needed for crystallization and data collection. The N(alpha)(Me) group is directed toward the carbonyl oxygen atom of Ser214, pushing the Ser195 O(gamma) atom out of its normal site. This structure suggests that upon thrombin binding, the scissile peptide bond of the intact peptide and the Ser195 O(gamma) are separated from each other, impairing the nucleophilic attack of the Ser195 O(gamma) toward the N(alpha)(Me)Arg carbonyl group. In the time-scale of two weeks, however, cleavage geometries favoured by the crystal allow catalysis at a slow rate.


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Martinsried, Germany. rfried@biochem.mpg.de



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PEPTIDE INHIBITOR A10synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
THROMBIN HEAVY CHAIN H257Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Explore P00734 
Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS:  P00734
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
THROMBIN LIGHT CHAIN L27Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Explore P00734 
Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS:  P00734
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
3-CYCLOHEXYL-D-ALANYL-L-PROLYL-N~2~-METHYL-L-ARGININE B3synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MMO
Query on MMO
BL-PEPTIDE LINKINGC7 H16 N4 O2ARG
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.839α = 90
b = 71.508β = 99.34
c = 71.71γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-01-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.2: 2012-11-21
    Changes: Data collection, Database references, Other
  • Version 1.3: 2012-11-30
    Changes: Other
  • Version 1.4: 2017-02-08
    Changes: Source and taxonomy, Structure summary
  • Version 1.5: 2018-06-20
    Changes: Advisory, Data collection, Derived calculations