4NOS

HUMAN INDUCIBLE NITRIC OXIDE SYNTHASE WITH INHIBITOR

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structural characterization of nitric oxide synthase isoforms reveals striking active-site conservation.

Fischmann, T.O., Hruza, A., Niu, X.D., Fossetta, J.D., Lunn, C.A., Dolphin, E., Prongay, A.J., Reichert, P., Lundell, D.J., Narula, S.K., Weber, P.C.

(1999) Nat Struct Biol 6: 233-242

  • DOI: 10.1038/6675
  • Primary Citation of Related Structures:  
    3NOS, 4NOS

  • PubMed Abstract: 

    • Crystal structures of human endothelial nitric oxide synthase (eNOS) and human inducible NOS (iNOS) catalytic domains were solved in complex with the arginine substrate and an inhibitor S-ethylisothiourea (SEITU), respectively. The small molecules bind in a narrow cleft within the larger active-site cavity containing heme and tetrahydrobiopterin ...

    Crystal structures of human endothelial nitric oxide synthase (eNOS) and human inducible NOS (iNOS) catalytic domains were solved in complex with the arginine substrate and an inhibitor S-ethylisothiourea (SEITU), respectively. The small molecules bind in a narrow cleft within the larger active-site cavity containing heme and tetrahydrobiopterin. Both are hydrogen-bonded to a conserved glutamate (eNOS E361, iNOS E377). The active-site residues of iNOS and eNOS are nearly identical. Nevertheless, structural comparisons provide a basis for design of isozyme-selective inhibitors. The high-resolution, refined structures of eNOS (2.4 A resolution) and iNOS (2.25 A resolution) reveal an unexpected structural zinc situated at the intermolecular interface and coordinated by four cysteines, two from each monomer.

    Organizational Affiliation: 

    Structural Chemistry Department, Schering-Plough Research Institute, Kenilworth, New Jersey 07033, USA. thierry.fischmann@spcorp.com



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INDUCIBLE NITRIC OXIDE SYNTHASEA, B, C, D427Homo sapiensMutation(s): 0 
Gene Names: NOS2, NOS2A
EC: 1.14.13.39
UniProt & NIH Common Fund Data Resources
Find proteins for P35228 (Homo sapiens)
Explore P35228 
Go to UniProtKB:  P35228
PHAROS:  P35228
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35228
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 
F [auth A],
I [auth B],
M [auth C],
P [auth D]		PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L		 Ligand Interaction
H4B
Query on H4B
Download Ideal Coordinates CCD File 
J [auth B],
N [auth C],
Q [auth D]		5,6,7,8-TETRAHYDROBIOPTERIN
C9 H15 N5 O3
FNKQXYHWGSIFBK-RPDRRWSUSA-N		 Ligand Interaction
H2B
Query on H2B
Download Ideal Coordinates CCD File 
G [auth A]2-AMINO-6-(1,2-DIHYDROXY-PROPYL)-7,8-DIHYDRO-6H-PTERIDIN-4-ONE
C9 H13 N5 O3
ZHQJVZLJDXWFFX-RPDRRWSUSA-N		 Ligand Interaction
ITU
Query on ITU
Download Ideal Coordinates CCD File 
H [auth A],
K [auth B],
O [auth C],
R [auth D]		ETHYLISOTHIOUREA
C3 H8 N2 S
VFIZBHJTOHUOEK-UHFFFAOYSA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
E [auth A],
L [auth C]		ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
ITU Binding MOAD:  4NOS Ki: 19 (nM) from 1 assay(s)
BindingDB:  4NOS Ki: 5.2 (nM) from 1 assay(s)
IC50: 160 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.759α = 90
b = 156.672β = 90
c = 190.044γ = 90
Software Package:
Software NamePurpose
SHARPphasing
SOLOMONphasing
X-PLORrefinement
DENZOdata reduction
CCP4data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-02-04
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance