3Q99

Structure of neuronal nitric oxide synthase in the ferric state in complex with N~5~-[(3-(ethylsulfanyl)propanimidoyl]-L-ornithine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Temperature-dependent spin crossover in neuronal nitric oxide synthase bound with the heme-coordinating thioether inhibitors.

Doukov, T.Li, H.Sharma, A.Martell, J.D.Soltis, S.M.Silverman, R.B.Poulos, T.L.

(2011) J.Am.Chem.Soc. 133: 8326-8334

  • DOI: 10.1021/ja201466v
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • A series of L-arginine analogue nitric oxide synthase inhibitors with a thioether tail have been shown to form an Fe-S thioether interaction as evidenced by continuous electron density between the Fe and S atoms. Even so, the Fe-S thioether interacti ...

    A series of L-arginine analogue nitric oxide synthase inhibitors with a thioether tail have been shown to form an Fe-S thioether interaction as evidenced by continuous electron density between the Fe and S atoms. Even so, the Fe-S thioether interaction was found to be far less important for inhibitor binding than the hydrophobic interactions between the alkyl group in the thioether tail and surrounding protein (Martell et al. J. Am. Chem. Soc. 2010 , 132 , 798). However, among the few thioether inhibitors that showed Fe-S thioether interaction in crystal structures, variations in spin state (high-spin or low-spin) were observed dependent upon the heme iron oxidation state and temperature. Since modern synchrotron X-ray data collection is typically carried out at cryogenic temperatures, we reasoned that some of the discrepancies between cryo-crystal structures and room-temperature UV-visible spectroscopy could be the result of temperature-dependent spin-state changes. We, therefore, have characterized some of these neuronal nitric oxide synthase (nNOS)-thioether inhibitor complexes in both crystal and solution using EPR and UV-visible absorption spectrometry as a function of temperature and the heme iron redox state. We found that some thioether inhibitors switch from high to low spin at lower temperatures similar to the "spin crossover" phenomenon observed in many transition metal complexes.


    Organizational Affiliation

    Macromolecular Crystallographic Group, Stanford Synchrotron Radiation Lightsource, SLAC, Stanford University, Stanford, California 94309, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nitric oxide synthase, brain
A, B
422Rattus norvegicusMutation(s): 0 
Gene Names: Nos1 (Bnos)
EC: 1.14.13.39
Find proteins for P29476 (Rattus norvegicus)
Go to UniProtKB:  P29476
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
JM8
Query on JM8

Download SDF File 
Download CCD File 
A, B
N~5~-[(3-(ethylsulfanyl)propanimidoyl]-L-ornithine
C10 H21 N3 O2 S
HAZXKSBWYNTCGM-QMMMGPOBSA-N
 Ligand Interaction
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download SDF File 
Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
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
H4B
Query on H4B

Download SDF File 
Download CCD File 
A, 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: 2.15 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 52.165α = 90.00
b = 111.422β = 90.00
c = 164.214γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
Blu-Icedata collection
REFMACphasing
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-08
    Type: Refinement description