Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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: 36.36 kDa 
• Atom Count: 2905 
• Modelled Residue Count: 290 
• Deposited Residue Count: 308 
• Unique protein chains: 3

3SI4

Human Thrombin In Complex With UBTHR104

• DOI: 10.2210/pdb3SI4/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Homo sapiens, Hirudo medicinalis
• Mutation(s): No 


• Deposited: 2011-06-17 Released: 2012-06-20 
• Deposition Author(s): Biela, A., Heine, A., Klebe, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.27 Å
• R-Value Free: 0.159 
• R-Value Work: 0.137 
• R-Value Observed: 0.138 

Literature

Impact of ligand and protein desolvation on ligand binding to the S1 pocket of thrombin

Biela, A., Khayat, M., Tan, H., Kong, J., Heine, A., Hangauer, D., Klebe, G.

(2012) J Mol Biol 418: 350-366

• PubMed: 22366545 
• DOI: 10.1016/j.jmb.2012.01.054
• Primary Citation of Related Structures:  
  3SHA, 3SHC, 3SI3, 3SI4, 3P17, 3QTO, 3QTV, 3QX5, 3QWC, 3SV2


• PubMed Abstract: 
  

In the present study, we investigate the impact of a tightly bound water molecule on ligand binding in the S1 pocket of thrombin. The S1 pocket contains a deeply buried deprotonated aspartate residue (Asp189) that is, due to its charged state, well hydrated in the uncomplexed state. We systematically studied the importance of this water molecule by evaluating a series of ligands that contains pyridine-type P1 side chains that could potentially alter the binding properties of this water molecule. All of the pyridine derivatives retain the original hydration state albeit sometimes with a slight perturbance. In order to prevent a direct H-bond formation with Asp189, and to create a permanent positive charge on the P1 side chain that is positioned adjacent to the Asp189 carboxylate anion, we methylated the pyridine nitrogen. This methylation resulted in displacement of water but was accompanied by a loss in binding affinity. Quantum chemical calculations of the ligand solvation free energy showed that the positively charged methylpyridinium derivatives suffer a large penalty of desolvation upon binding. Consequently, they have a substantially less favorable enthalpy of binding. In addition to the ligand desolvation penalty, the hydration shell around Asp189 has to be overcome, which is achieved in nearly all pyridinium derivatives. Only for the ortho derivative is a partial population of a water next to Asp189 found. Possibly, the gain of electrostatic interactions between the charged P1 side chain and Asp189 helps to compensate for the desolvation penalty. In all uncharged pyridine derivatives, the solvation shell remains next to Asp189, partly mediating interactions between ligand and protein. In the case of the para-pyridine derivative, a strongly disordered cluster of water sites is observed between ligand and Asp189.

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Organizational Affiliation: 

Department of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg 6, 35032 Marburg, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thrombin light chain	L	36	Homo sapiens	Mutation(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 GTEx:  ENSG00000180210

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Thrombin heavy chain	H	259	Homo sapiens	Mutation(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 GTEx:  ENSG00000180210

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Hirudin variant-2	I	13	Hirudo medicinalis	Mutation(s): 0
Find proteins for P09945 (Hirudo medicinalis) Explore P09945  Go to UniProtKB:  P09945

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
B04	H	D-phenylalanyl-N-[(1-methylpyridinium-2-yl)methyl]-L-prolinamide C21 H27 N4 O2 GWFYERFSYVJQNW-MOPGFXCFSA-O
NAG	H	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
PO4	H	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
GOL	H	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
NA	H	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

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

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
B04	Ki :  132200   nM  PDBBind
B04	Ki:  132200   nM  Binding MOAD

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 5
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000802 (B04)	H	D-PHENYLALANYL-N-[(1-METHYLPYRIDINIUM-2-YL)METHYL]-L-PROLINAMIDE	Peptide-like /  Thrombin inhibitor		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.27 Å
• R-Value Free: 0.159 
• R-Value Work: 0.137 
• R-Value Observed: 0.138 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.35	α = 90
b = 71.23	β = 100.36
c = 72.59	γ = 90

Software Package:

Software Name	Purpose
MAR345dtb	data collection
PHASER	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-06-17 
• Released Date: 2012-06-20 
Deposition Author(s): Biela, A., Heine, A., Klebe, G.

Revision History  

• Version 1.0: 2012-06-20
  Type: Initial release
  
• Version 1.1: 2012-12-12
  Changes: Other
• Version 1.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary