2EI6

FACTOR XA IN COMPLEX WITH THE INHIBITOR (-)-cis-N1-[(5-Chloroindol-2-yl)carbonyl]-N2-[(5-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridin-2-yl)carbonyl]-1,2-cyclohexanediamine

• PDB DOI: https://doi.org/10.2210/pdb2EI6/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2007-03-12 Released: 2008-03-18 
• Deposition Author(s): Suzuki, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.262 
• R-Value Work: 0.197 
• R-Value Observed: 0.200 

Starting Model: experimental

Literature

Cycloalkanediamine derivatives as novel blood coagulation factor Xa inhibitors.

Nagata, T., Yoshino, T., Haginoya, N., Yoshikawa, K., Isobe, Y., Furugohri, T., Kanno, H.

(2007) Bioorg Med Chem Lett 17: 4683-4688

• PubMed: 17555959 
• DOI: https://doi.org/10.1016/j.bmcl.2007.05.068
• Primary Citation of Related Structures:  
  2EI6


• PubMed Abstract: 
  

  This paper describes the synthesis of orally available potent fXa inhibitors 2 and 3 by modification of the piperazine part of lead compound 1. Carbonyl derivative 3 showed potent fXa activity but not sulfonyl derivative 2. Among the compounds synthesized, cyclohexane derivatives 3g and 3h and cycloheptane derivative 3j had potent anticoagulant activity as well as anti-fXa activity. Synthetic study of the optical isomers of 3g demonstrated that (-)-3g had more potent activity.

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Organizational Affiliation: 

Medicinal Chemistry Research Laboratory, Daiichi Pharmaceutical Co., Ltd, 1-16-13, Kita-Kasai, Edogawa-ku, Tokyo 134-8630, Japan. [e-mail]

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 32.75 kDa 
• Atom Count: 2,239 
• Modelled Residue Count: 287 
• Deposited Residue Count: 287 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Coagulation factor X, heavy chain	A	233	Homo sapiens	Mutation(s): 0  EC: 3.4.21.6
UniProt & NIH Common Fund Data Resources
Find proteins for P00742 (Homo sapiens) Explore P00742  Go to UniProtKB:  P00742
PHAROS:  P00742 GTEx:  ENSG00000126218

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Coagulation factor X, light chain	B	54	Homo sapiens	Mutation(s): 0  EC: 3.4.21.6
UniProt & NIH Common Fund Data Resources
Find proteins for P00742 (Homo sapiens) Explore P00742  Go to UniProtKB:  P00742
PHAROS:  P00742 GTEx:  ENSG00000126218

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
D92	E [auth A]	N-((1R,2S)-2-(5-CHLORO-1H-INDOLE-2-CARBOXAMIDO)CYCLOHEXYL)-5-METHYL-4,5,6,7-TETRAHYDROTHIAZOLO[5,4-C]PYRIDINE-2-CARBOXAMIDE C23 H26 Cl N5 O2 S ARPFWVKYXJZULB-DLBZAZTESA-N
CA	C [auth A], D [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
D92	PDBBind:  2EI6	IC50: 41 (nM) from 1 assay(s)
	BindingDB:  2EI6	IC50: 16 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.262 
• R-Value Work: 0.197 
• R-Value Observed: 0.200 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56.805	α = 90
b = 72.971	β = 90
c = 79.552	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
CrystalClear	data collection
d*TREK	data reduction
d*TREK	data scaling
REFMAC	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-03-18 
Deposition Author(s): Suzuki, M.

Revision History  

• Version 1.0: 2008-03-18
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-10-25
  Changes: Data collection, Database references, Derived calculations, Refinement description