2AMO

Loose Dimer of a Bacillus subtilis Nitric Oxide Synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.274 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a loose dimer: an intermediate in nitric oxide synthase assembly.

Pant, K.Crane, B.R.

(2005) J.Mol.Biol. 352: 932-940

  • DOI: 10.1016/j.jmb.2005.07.070
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cooperativity among ligand binding, subunit association, and protein folding has implications for enzyme regulation as well as protein aggregation events associated with disease. The binding of substrate l-arginine or cofactor tetrahydrobiopterin con ...

    Cooperativity among ligand binding, subunit association, and protein folding has implications for enzyme regulation as well as protein aggregation events associated with disease. The binding of substrate l-arginine or cofactor tetrahydrobiopterin converts nitric oxide synthases (NOSs) from a "loose dimer", with an exposed active center and higher sensitivity to proteolysis, to a "tight dimer" competent for catalysis. The crystallographic structure of the Bacillus subtilis NOS loose dimer shows an altered association state with severely destabilized subdomains. Ligand binding or heme reduction converts loose dimers to tight dimers in solution and crystals. Mutations at key positions in the dimer interface that distinguish prokaryotic from eukaryotic NOSs affect the propensity to form loose dimers. The loose dimer structure indicates that non-native interactions can mediate subunit association in NOS.


    Organizational Affiliation

    Department of Chemistry and Chemical Biology, Cornell University Ithaca, NY 14853, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nitric oxide synthase oxygenase
A, B
362Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: nos (yflM)
EC: 1.14.14.47
Find proteins for O34453 (Bacillus subtilis (strain 168))
Go to UniProtKB:  O34453
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.274 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 81.314α = 90.00
b = 93.211β = 90.00
c = 118.546γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
HKL-2000data reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2005-08-09 
  • Released Date: 2006-10-31 
  • Deposition Author(s): Pant, K., Crane, B.R.

Revision History 

  • Version 1.0: 2006-10-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance