6NHB

Structure of human neuronal nitric oxide synthase R354A/G357D mutant heme domain in complex with 6-(5-(2-((2S,4R)-4-ethoxy-1-methylpyrrolidin-2-yl)ethyl)-2,3-difluorophenethyl)-4-methylpyridin-2-amine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Optimization of Blood-Brain Barrier Permeability with Potent and Selective Human Neuronal Nitric Oxide Synthase Inhibitors Having a 2-Aminopyridine Scaffold.

Do, H.T.Li, H.Chreifi, G.Poulos, T.L.Silverman, R.B.

(2019) J Med Chem 62: 2690-2707

  • DOI: https://doi.org/10.1021/acs.jmedchem.8b02032
  • Primary Citation of Related Structures:  
    6NG1, 6NG2, 6NG4, 6NG5, 6NG6, 6NG7, 6NG8, 6NGA, 6NGB, 6NGC, 6NGD, 6NGE, 6NGF, 6NGH, 6NGI, 6NGJ, 6NGK, 6NGL, 6NGM, 6NGN, 6NGP, 6NGQ, 6NGR, 6NGS, 6NGT, 6NGU, 6NGV, 6NGW, 6NGX, 6NGY, 6NGZ, 6NH0, 6NH1, 6NH2, 6NH3, 6NH4, 6NH5, 6NH6, 6NH7, 6NH8, 6NHB, 6NHC, 6NHD, 6NHE, 6NHF

  • PubMed Abstract: 

    Effective delivery of therapeutic drugs into the human brain is one of the most challenging tasks in central nervous system drug development because of the blood-brain barrier (BBB). To overcome the BBB, both passive permeability and efflux transporter liability of a compound must be addressed. Herein, we report our optimization related to BBB penetration of neuronal nitric oxide synthase (nNOS) inhibitors toward the development of new drugs for neurodegenerative diseases. Various approaches, including enhancing lipophilicity and rigidity of new inhibitors and modulating the p K a of amino groups, have been employed. In addition to determining inhibitor potency and selectivity, crystal structures of most newly designed compounds complexed to various nitric oxide synthase isoforms have been determined. We have discovered a new analogue (21), which exhibits not only excellent potency ( K i < 30 nM) in nNOS inhibition but also a significantly low P-glycoprotein and breast-cancer-resistant protein substrate liability as indicated by an efflux ratio of 0.8 in the Caco-2 bidirectional assay.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nitric oxide synthase, brain
A, B
421Homo sapiensMutation(s): 2 
Gene Names: NOS1
EC: 1.14.13.39
UniProt & NIH Common Fund Data Resources
Find proteins for P29475 (Homo sapiens)
Explore P29475 
Go to UniProtKB:  P29475
PHAROS:  P29475
GTEx:  ENSG00000089250 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29475
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A],
I [auth B]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
KNS
Query on KNS

Download Ideal Coordinates CCD File 
E [auth A],
K [auth B]
6-[2-(5-{2-[(2S,4R)-4-ethoxy-1-methylpyrrolidin-2-yl]ethyl}-2,3-difluorophenyl)ethyl]-4-methylpyridin-2-amine
C23 H31 F2 N3 O
JJRCJHDDDMVMGM-VQTJNVASSA-N
H4B
Query on H4B

Download Ideal Coordinates CCD File 
D [auth A],
J [auth B]
5,6,7,8-TETRAHYDROBIOPTERIN
C9 H15 N5 O3
FNKQXYHWGSIFBK-RPDRRWSUSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
L [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
H [auth B]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
KNS BindingDB:  6NHB Ki: 87 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.024α = 90
b = 122.945β = 90
c = 164.407γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
REFMACphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesGM57353

Revision History  (Full details and data files)

  • Version 1.0: 2019-03-13
    Type: Initial release
  • Version 1.1: 2019-03-27
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description