3EQ0

Thrombin Inhibitor

• PDB DOI: https://doi.org/10.2210/pdb3EQ0/pdb

• Classification: Hydrolase/Hydrolase Inhibitor
• Organism(s): Homo sapiens, Hirudo medicinalis
• Mutation(s): No 


• Deposited: 2008-09-30 Released: 2009-08-18 
• Deposition Author(s): Baum, B., Heine, A., Klebe, G., Steinmetzer, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.53 Å
• R-Value Free: 0.249 
• R-Value Work: 0.196 
• R-Value Observed: 0.198 

Starting Model: experimental

Literature

Thrombin Inhibition

Baum, B., Steinmetzer, T., Heine, A., Klebe, G.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 35.92 kDa 
• Atom Count: 2,507 
• Modelled Residue Count: 283 
• Deposited Residue Count: 306 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thrombin Light Chain	A [auth L]	36	Homo sapiens	Mutation(s): 0  EC: 3.4.21.5
UniProt & NIH Common Fund Data Resources
Find proteins for P00734 (Homo sapiens) Explore P00734  Go to UniProtKB:  P00734
PHAROS:  P00734 GTEx:  ENSG00000180210

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Thrombin Heavy Chain	B [auth H]	259	Homo sapiens	Mutation(s): 0  EC: 3.4.21.5
UniProt & NIH Common Fund Data Resources
Find proteins for P00734 (Homo sapiens) Explore P00734  Go to UniProtKB:  P00734
PHAROS:  P00734 GTEx:  ENSG00000180210

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Hirudin variant-1	C [auth I]	11	Hirudo medicinalis	Mutation(s): 0
UniProt
Find proteins for P01050 (Hirudo medicinalis) Explore P01050  Go to UniProtKB:  P01050

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
2TS	D [auth H]	(2S)-N-[[2-(aminomethyl)-5-chloro-phenyl]methyl]-1-[(2R)-5-carbamimidamido-2-(phenylmethylsulfonylamino)pentanoyl]pyrrolidine-2-carboxamide C26 H36 Cl N7 O4 S MWLLGEVAEDIFRC-PKTZIBPZSA-N
NA	E [auth H], F [auth H]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
TYS	C [auth I]	L-PEPTIDE LINKING	C9 H11 N O6 S		TYR

Binding Affinity Annotations
ID	Source	Binding Affinity
2TS	BindingDB:  3EQ0	Ki: min: 0.29, max: 1 (nM) from 2 assay(s)

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 4
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000667 (2TS)	D [auth H]	N~2~-(benzylsulfonyl)-D-arginyl-N-[2-(aminomethyl)-5-chlorobenzyl]-L-prolinamide	Peptide-like / Thrombin inhibitor

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.53 Å
• R-Value Free: 0.249 
• R-Value Work: 0.196 
• R-Value Observed: 0.198 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.1	α = 90
b = 71.4	β = 100.4
c = 72.4	γ = 90

Software Package:

Software Name	Purpose
MAR345	data collection
SHELX	model building
SHELXL-97	refinement
HKL-2000	data reduction
HKL-2000	data scaling
SHELX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-08-18 
Deposition Author(s): Baum, B., Heine, A., Klebe, G., Steinmetzer, T.

Revision History  

• Version 1.0: 2009-08-18
  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: 2012-12-12
  Changes: Other
• Version 1.3: 2016-05-25
  Changes: Source and taxonomy
• Version 1.4: 2017-10-25
  Changes: Refinement description
• Version 1.5: 2023-11-01
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.6: 2023-11-15
  Changes: Data collection
• Version 1.7: 2024-10-09
  Changes: Structure summary