1DF1

MURINE INOSOXY DIMER WITH ISOTHIOUREA BOUND IN THE ACTIVE SITE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.298 

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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.J.Arvai, A.S.Ghosh, D.K.Ghosh, S.Tainer, J.A.Stuehr, D.J.Getzoff, E.D.

(1999) EMBO J 18: 6271-6281

  • 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: 
    • 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

    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, B423Mus 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
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
ITU BindingDB:  1DF1 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: 2.35 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.298 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 214.464α = 90
b = 214.464β = 90
c = 112.752γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Experimental preparation