3NW2

Novel nanomolar Imidazopyridines as selective Nitric Oxide Synthase (iNOS) inhibitors: SAR and structural insights

• PDB DOI: https://doi.org/10.2210/pdb3NW2/pdb

• Classification: OXIDOREDUCTASE/OXIDOREDUCTASE inhibitor
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-07-09 Released: 2011-06-22 
• Deposition Author(s): Graedler, U., Fuchss, T., Ulrich, W.R., Boer, R., Strub, A., Hesslinger, C., Anezo, C., Diederichs, K., Zaliani, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.323 
• R-Value Work: 0.279 

Literature

Novel nanomolar imidazo[4,5-b]pyridines as selective nitric oxide synthase (iNOS) inhibitors: SAR and structural insights

Graedler, U., Fuchss, T., Ulrich, W.R., Boer, R., Strub, A., Hesslinger, C., Anezo, C., Diederichs, K., Zaliani, A.

(2011) Bioorg Med Chem Lett 21: 4228-4232

• PubMed: 21684157 
• DOI: https://doi.org/10.1016/j.bmcl.2011.05.073
• Primary Citation of Related Structures:  
  3NW2


• PubMed Abstract: 
  

  Inducible arginine oxidation and subsequent NO production by correspondent synthase (iNOS) are important cellular answers to proinflammatory signals. Prolonged NO production has been proved in higher organisms to cause stroke or septic shock. Several classes of potent NOS inhibitors have been reported, most of them targeting the arginine binding site of the oxygenase domain. Here we disclose the SAR and the rational design of potent and selective iNOS inhibitors which may be useful as anti-inflammatory drugs.

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Organizational Affiliation: 

Nycomed GmbH, Byk-Gulden-Str. 2, D-78467 Konstanz, Germany. [e-mail]

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 100.32 kDa 
• Atom Count: 6,991 
• Modelled Residue Count: 827 
• Deposited Residue Count: 846 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nitric oxide synthase, inducible	A, B	423	Mus musculus	Mutation(s): 0  EC: 1.14.13.39
UniProt & NIH Common Fund Data Resources
Find proteins for P29477 (Mus musculus) Explore P29477  Go to UniProtKB:  P29477
IMPC:  MGI:97361

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	C [auth A], G [auth B]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
MPW	F [auth A], I [auth B]	2-[2-(4-methoxypyridin-2-yl)ethyl]-3H-imidazo[4,5-b]pyridine C14 H14 N4 O YBOCDKFRGBOOFO-UHFFFAOYSA-N
H4B	D [auth A], H [auth B]	5,6,7,8-TETRAHYDROBIOPTERIN C9 H15 N5 O3 FNKQXYHWGSIFBK-RPDRRWSUSA-N
SO4	E [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.323 
• R-Value Work: 0.279 
• Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 212.6	α = 90
b = 212.6	β = 90
c = 111.5	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
XDS	data reduction
XSCALE	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-06-22 
Deposition Author(s): Graedler, U., Fuchss, T., Ulrich, W.R., Boer, R., Strub, A., Hesslinger, C., Anezo, C., Diederichs, K., Zaliani, A.

Revision History  

• Version 1.0: 2011-06-22
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2011-12-21
  Changes: Database references
• Version 1.3: 2017-11-08
  Changes: Refinement description
• Version 1.4: 2023-11-01
  Changes: Data collection, Database references, Derived calculations, Refinement description