1QOM

MURINE INDUCIBLE NITRIC OXIDE SYNTHASE OXYGENASE DIMER (DELTA 65) WITH SWAPPED N-TERMINAL HOOK


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

N-Terminal Domain Swapping and Metal Ion Binding in Nitric Oxide Synthase Dimerization

Crane, B.R.Rosenfeld, R.A.Arvai, A.S.Ghosh, D.K.Ghosh, S.Tainer, J.A.Stuehr, D.J.Getzoff, E.D.

(1999) EMBO J 18: 6271

  • DOI: 10.1093/emboj/18.22.6271
  • Primary Citation of Related Structures:  
    1DF1, 1QOM

  • PubMed Abstract: 
  • Nitric oxide synthase oxygenase domains (NOS(ox)) must bind tetrahydrobiopterin and dimerize to be active. New crystallographic structures of inducible NOS(ox) reveal that conformational changes in a switch region (residues 103-111) preceding a pterin-binding segment exchange N-terminal beta-hairpin hooks between subunits of the dimer ...

    Nitric oxide synthase oxygenase domains (NOS(ox)) must bind tetrahydrobiopterin and dimerize to be active. New crystallographic structures of inducible NOS(ox) reveal that conformational changes in a switch region (residues 103-111) preceding a pterin-binding segment exchange N-terminal beta-hairpin hooks between subunits of the dimer. N-terminal hooks interact primarily with their own subunits in the 'unswapped' structure, and two switch region cysteines (104 and 109) from each subunit ligate a single zinc ion at the dimer interface. N-terminal hooks rearrange from intra- to intersubunit interactions in the 'swapped structure', and Cys109 forms a self-symmetric disulfide bond across the dimer interface. Subunit association and activity are adversely affected by mutations in the N-terminal hook that disrupt interactions across the dimer interface only in the swapped structure. Residue conservation and electrostatic potential at the NOS(ox) molecular surface suggest likely interfaces outside the switch region for electron transfer from the NOS reductase domain. The correlation between three-dimensional domain swapping of the N-terminal hook and metal ion release with disulfide formation may impact inducible nitric oxide synthase (i)NOS stability and regulation in vivo.


    Related Citations: 
    • Inducible Nitric Oxide Synthase: Role of the N-Terminal Beta-Hairpin Hook and Pterin-Binding Segment in Dimerization and Tetrahydrobiopterin Interaction
      Ghosh, D.K., Crane, B.R., Ghosh, S., Wolan, D., Gachhui, R., Crooks, C., Presta, A., Tainer, J.A., Getzoff, E.D., Stuehr, D.J.
      (1999) EMBO J 18: 6260
    • 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
    • The Structure of Nitric Oxide Synthase Oxygenase Domain and Inhibitor Complexes
      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 The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA. crane.@its.caltech.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NITRIC OXIDE SYNTHASEA, B440Mus musculusMutation(s): 0 
Gene Names: Nos2Inosl
EC: 1.14.13.39
UniProt
Find proteins for P29477 (Mus musculus)
Explore P29477 
Go to UniProtKB:  P29477
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A], E [auth B]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
H4B (Subject of Investigation/LOI)
Query on H4B

Download Ideal Coordinates CCD File 
D [auth A], F [auth B]5,6,7,8-TETRAHYDROBIOPTERIN
C9 H15 N5 O3
FNKQXYHWGSIFBK-RPDRRWSUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 212.98α = 90
b = 212.98β = 90
c = 114.2γ = 120
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-15
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-10-09
    Changes: Data collection, Derived calculations, Experimental preparation