6EYE

Crystal structure of murine neuroglobin under 150 bar krypton


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Mapping Hydrophobic Tunnels and Cavities in Neuroglobin with Noble Gas under Pressure.

Colloc'h, N.Carpentier, P.Montemiglio, L.C.Vallone, B.Prange, T.

(2017) Biophys J 113: 2199-2206

  • DOI: https://doi.org/10.1016/j.bpj.2017.10.014
  • Primary Citation of Related Structures:  
    5NVI, 5NW6, 5O17, 5O18, 5O1K, 5O27, 6EYE

  • PubMed Abstract: 

    Internal cavities are crucial for conformational flexibility of proteins and can be mapped through noble gas diffusion and docking. Here we investigate the hydrophobic cavities and tunnel network in neuroglobin (Ngb), a hexacoordinated heme protein likely to be involved in neuroprotection, using crystallography under noble gas pressure, mostly at room temperature. In murine Ngb, a large internal cavity is involved in the heme sliding mechanism to achieve binding of gaseous ligands through coordination to the heme iron. In this study, we report that noble gases are hosted by two major sites within the internal cavity. We propose that these cavities could store oxygen and allow its relay in the heme proximity, which could correspond to NO location in the nitrite-reductase function of Ngb. Thanks to a recently designed pressurization cell using krypton at high pressure, a new gas binding site has been characterized that reveals an alternate pathway for gaseous ligands. A new gas binding site on the proximal side of the heme has also been characterized, using xenon pressure on a Ngb mutant (V140W) that binds CO with a similar rate and affinity to the wild-type, despite a reshaping of the internal cavity. Moreover, this study, to our knowledge, provides new insights into the determinants of the heme sliding mechanism, suggesting that the shift at the beginning of helix G precedes and drives this process.


  • Organizational Affiliation

    ISTCT CNRS UNICAEN CEA Normandie University, CERVOxy Team, Centre Cyceron, Caen, France. Electronic address: colloch@cyceron.fr.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Neuroglobin154Mus musculusMutation(s): 2 
Gene Names: Ngb
UniProt
Find proteins for Q9ER97 (Mus musculus)
Explore Q9ER97 
Go to UniProtKB:  Q9ER97
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ER97
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
SO4
Query on SO4

Download Ideal Coordinates CCD File 
B [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
KR
Query on KR

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A]
KRYPTON
Kr
DNNSSWSSYDEUBZ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.854α = 90
b = 87.854β = 90
c = 113.21γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
REFMACphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-29
    Type: Initial release
  • Version 1.1: 2018-02-21
    Changes: Database references, Structure summary
  • Version 1.2: 2019-09-04
    Changes: Data collection, Structure summary
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Refinement description