4C3A

Structure of bovine endothelial nitric oxide synthase heme domain in complex with 6-((((3S, 5R)-5-(((6-amino-4-methylpyridin-2-yl)methoxy) methyl)pyrrolidin-3-yl)oxy) methyl)-4-methylpyridin-2-amine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

An Accessible Chiral Linker to Enhance Potency and Selectivity of Neuronal Nitric Oxide Synthase Inhibitors.

Jing, Q.Li, H.Roman, L.J.Martasek, P.Poulos, T.L.Silverman, R.B.

(2014) ACS Med Chem Lett 5: 56

  • DOI: https://doi.org/10.1021/ml400381s
  • Primary Citation of Related Structures:  
    4C39, 4C3A

  • PubMed Abstract: 

    The three important mammalian isozymes of nitric oxide synthase (NOS) are neuronal NOS (nNOS), endothelial NOS (eNOS), and inducible NOS (iNOS). Inhibitors of nNOS show promise as treatments for neurodegenerative diseases. Eight easily-synthesized compounds containing either one ( 20a,b ) or two ( 9a-d; 15a,b ) 2-amino-4-methylpyridine groups with a chiral pyrrolidine linker were designed as selective nNOS inhibitors. Inhibitor 9c is the best of these compounds, having a potency of 9.7 nM and dual selectivity of 693 and 295 against eNOS and iNOS, respectively. Crystal structures of nNOS complexed with either 9a or 9c show a double-headed binding mode, where each 2-aminopyridine head group interacts with either a nNOS active site Glu residue or a heme propionate. In addition, the pyrrolidine nitrogen of 9c contributes additional hydrogen bonds to the heme propionate, resulting in a unique binding orientation. In contrast, the lack of hydrogen bonds from the pyrrolidine of 9a to the heme propionate allows the inhibitor to adopt two different binding orientations. Both 9a and 9c bind to eNOS in a single-headed mode, which is the structural basis for the isozyme selectivity.


  • Organizational Affiliation

    Department of Chemistry, Department of Molecular Biosciences, Chemistry of Life Processes Institute, Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, Illinois 60208-3113, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NITRIC OXIDE SYNTHASE, ENDOTHELIAL
A, B
443Rattus norvegicusMutation(s): 0 
EC: 1.14.13.39
UniProt
Find proteins for P29473 (Bos taurus)
Explore P29473 
Go to UniProtKB:  P29473
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29473
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A],
J [auth B]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
Q16
Query on Q16

Download Ideal Coordinates CCD File 
E [auth A],
L [auth B]
6-((((3S, 5R)-5-(((6-amino-4-methylpyridin-2-yl)methoxy)methyl)pyrrolidin-3-yl)oxy)methyl)-4-methylpyridin-2-amine
C19 H27 N5 O2
NUKSCYDKRQJOFO-PBHICJAKSA-N
H4B
Query on H4B

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

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

Download Ideal Coordinates CCD File 
I [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
ACT
Query on ACT

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
M [auth B],
N [auth B]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CAS
Query on CAS
A, B
L-PEPTIDE LINKINGC5 H12 As N O2 SCYS
Binding Affinity Annotations 
IDSourceBinding Affinity
Q16 BindingDB:  4C3A Ki: min: 6727, max: 6927 (nM) from 2 assay(s)
Binding MOAD:  4C3A Ki: 6727 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.721α = 90
b = 106.251β = 90
c = 156.665γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
HKL-2000phasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-02
    Type: Initial release
  • Version 1.1: 2017-03-08
    Changes: Other
  • Version 1.2: 2017-03-29
    Changes: Other