1NSI

HUMAN INDUCIBLE NITRIC OXIDE SYNTHASE, ZN-BOUND, L-ARG COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.209 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Crystal structures of zinc-free and -bound heme domain of human inducible nitric-oxide synthase. Implications for dimer stability and comparison with endothelial nitric-oxide synthase.

Li, H.Raman, C.S.Glaser, C.B.Blasko, E.Young, T.A.Parkinson, J.F.Whitlow, M.Poulos, T.L.

(1999) J Biol Chem 274: 21276-21284

  • DOI: https://doi.org/10.1074/jbc.274.30.21276
  • Primary Citation of Related Structures:  
    1NSI, 2NSI

  • PubMed Abstract: 

    The crystal structures of the heme domain of human inducible nitric-oxide synthase (NOS-2) in zinc-free and -bound states have been solved. In the zinc-free structure, two symmetry-related cysteine residues form a disulfide bond. In the zinc-bound state, these same two cysteine residues form part of a zinc-tetrathiolate (ZnS(4)) center indistinguishable from that observed in the endothelial isoform (NOS-3). As in NOS-3, ZnS(4) plays a key role in stabilizing intersubunit contacts and in maintaining the integrity of the cofactor (tetrahydrobiopterin) binding site of NOS-2. A comparison of NOS-2 and NOS-3 structures illustrates the conservation of quaternary structure, tertiary topology, and substrate and cofactor binding sites, in addition to providing insights on isoform-specific inhibitor design. The structural comparison also reveals that pterin binding does not preferentially stabilize the dimer interface of NOS-2 over NOS-3.


  • Organizational Affiliation

    Department of Molecular Biology and Biochemistry, University of California at Irvine, Irvine, California 92697, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (NITRIC OXIDE SYNTHASE)
A, B, C, D
431Homo sapiensMutation(s): 0 
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
GTEx:  ENSG00000007171 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35228
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 
BA [auth D],
I [auth A],
O [auth B],
V [auth C]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
H4B
Query on H4B

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

Download Ideal Coordinates CCD File 
DA [auth D],
K [auth A],
Q [auth B],
X [auth C]
ARGININE
C6 H15 N4 O2
ODKSFYDXXFIFQN-BYPYZUCNSA-O
SO4
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth D]
E [auth A]
F [auth A]
G [auth A]
M [auth B]
AA [auth D],
E [auth A],
F [auth A],
G [auth A],
M [auth B],
N [auth B],
S [auth C],
T [auth C],
Z [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

Download Ideal Coordinates CCD File 
EA [auth D],
L [auth A],
R [auth B],
Y [auth C]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
H [auth A],
U [auth C]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.209 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 187.35α = 90
b = 187.35β = 90
c = 227.49γ = 90
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-01-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2020-03-11
    Changes: Derived calculations
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Derived calculations
  • Version 1.5: 2024-04-03
    Changes: Refinement description