2NSI

HUMAN INDUCIBLE NITRIC OXIDE SYNTHASE, ZN-FREE, SEITU COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.2 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

  • Primary Citation of Related Structures:  

  • 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 st ...

    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.


    Related Citations: 
    • Structure of Nitric Oxide Synthase Oxygenase Dimer with Pterin and Substrate
      Crane, B.R.,Arvai, A.S.,Ghosh, D.K.,Wu, C.,Getzoff, E.D.,Stuehr, D.J.,Tainer, J.A.
      (1998) Science 279: 2121
    • Crystal Structure of Constitutive Endothelial Nitric Oxide Synthase: A Paradigm for Pterin Function Involving a Novel Metal Center
      Raman, C.S.,Li, H.,Martasek, P.,Kral, V.,Masters, B.S.,Poulos, T.L.
      (1998) Cell 95: 939
    • The Structure of Nitric Oxide Synthase Oxygenase Domain and Inhibitor Complex
      Crane, B.R.,Arvai, A.S.,Gachhui, R.,Wu, C.,Ghosh, D.K.,Getzoff, E.D.,Stuehr, D.J.,Tainer, J.A.
      (1997) Science 278: 425


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (NITRIC OXIDE SYNTHASE)
A, B, C, D
431Homo sapiensMutation(s): 0 
Gene Names: NOS2 (NOS2A)
EC: 1.14.13.39
Find proteins for P35228 (Homo sapiens)
Go to Gene View: NOS2
Go to UniProtKB:  P35228
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B, C, D
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
ITU
Query on ITU

Download SDF File 
Download CCD File 
A, B, C, D
ETHYLISOTHIOUREA
C3 H8 N2 S
VFIZBHJTOHUOEK-UHFFFAOYSA-N
 Ligand Interaction
H4B
Query on H4B

Download SDF File 
Download CCD File 
A, B, C, D
5,6,7,8-TETRAHYDROBIOPTERIN
C9 H15 N5 O3
FNKQXYHWGSIFBK-RPDRRWSUSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ITUKi: 5.2 nM (86) BINDINGDB
ITUIC50: 160 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.214 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 188.370α = 90.00
b = 188.370β = 90.00
c = 230.160γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORmodel building
X-PLORrefinement
X-PLORphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-01-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance