4CAM

Structure of rat neuronal nitric oxide synthase heme domain in complex with 7-((3-Fluorophenethylamino)methyl)quinolin-2-amine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Simplified 2-Aminoquinoline-Based Scaffold for Potent and Selective Neuronal Nitric Oxide Synthase Inhibition.

Cinelli, M.A.Li, H.Chreifi, G.Martasek, P.Roman, L.J.Poulos, T.L.Silverman, R.B.

(2014) J Med Chem 57: 1513

  • DOI: 10.1021/jm401838x
  • Primary Citation of Related Structures:  
    4CAM, 4CAN, 4CAO, 4CAP, 4CAQ, 4CAR, 4CDT, 4CFT

  • PubMed Abstract: 
  • Since high levels of nitric oxide (NO) are implicated in neurodegenerative disorders, inhibition of the neuronal isoform of nitric oxide synthase (nNOS) and reduction of NO levels are therapeutically desirable. Nonetheless, many nNOS inhibitors mimic ...

    Since high levels of nitric oxide (NO) are implicated in neurodegenerative disorders, inhibition of the neuronal isoform of nitric oxide synthase (nNOS) and reduction of NO levels are therapeutically desirable. Nonetheless, many nNOS inhibitors mimic l-arginine and are poorly bioavailable. 2-Aminoquinoline-based scaffolds were designed with the hope that they could (a) mimic aminopyridines as potent, isoform-selective arginine isosteres and (b) possess chemical properties more conducive to oral bioavailability and CNS penetration. A series of these compounds was synthesized and assayed against purified nNOS enzymes, endothelial NOS (eNOS), and inducible NOS (iNOS). Several compounds built on a 7-substituted 2-aminoquinoline core are potent and isoform-selective; X-ray crystallography indicates that aminoquinolines exert inhibitory effects by mimicking substrate interactions with the conserved active site glutamate residue. The most potent and selective compounds, 7 and 15, were tested in a Caco-2 assay and showed good permeability and low efflux, suggesting high potential for oral bioavailability.


    Organizational Affiliation

    Departments of Chemistry and Molecular Biosciences, Chemistry of Life Processes Institute, Center for Molecular Innovation and Drug Discovery, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NITRIC OXIDE SYNTHASE, BRAINAB422Rattus norvegicusMutation(s): 0 
Gene Names: Nos1Bnos
EC: 1.14.13.39
Find proteins for P29476 (Rattus norvegicus)
Explore P29476 
Go to UniProtKB:  P29476
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
M87
Query on M87

Download Ideal Coordinates CCD File 
A, B
7-[[2-(3-fluorophenyl)ethylamino]methyl]quinolin-2-amine
C18 H18 F N3
YXSBPQQVHVXHJN-UHFFFAOYSA-N
 Ligand Interaction
H4B
Query on H4B

Download Ideal Coordinates CCD File 
A, B
5,6,7,8-TETRAHYDROBIOPTERIN
C9 H15 N5 O3
FNKQXYHWGSIFBK-RPDRRWSUSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
M87Ki:  74   nM  BindingDB
M87Ki:  75   nM  BindingDB
M87Ki:  493   nM  BindingDB
M87Ki:  75   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.928α = 90
b = 111.126β = 90
c = 164.904γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
REFMACphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2013-10-08 
  • Released Date: 2014-02-19 
  • Deposition Author(s): Li, H., Poulos, T.L.

Revision History 

  • Version 1.0: 2014-02-19
    Type: Initial release
  • Version 1.1: 2014-03-12
    Changes: Database references