3GK9

Crystal structure of murine Ngb under Xe pressure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The structure of neuroglobin at high Xe and Kr pressure reveals partial conservation of globin internal cavities.

Moschetti, T.Mueller, U.Schulze, J.Brunori, M.Vallone, B.

(2009) Biophys J 97: 1700-1708

  • DOI: 10.1016/j.bpj.2009.05.059
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Neuroglobin (Ngb) is a hexacoordinate globin expressed in the brain of vertebrates. Ferrous Ngb binds dioxygen with high affinity and the O(2) adduct is able to scavenge NO. Convincing in vitro and in vivo data indicate that Ngb is involved in neurop ...

    Neuroglobin (Ngb) is a hexacoordinate globin expressed in the brain of vertebrates. Ferrous Ngb binds dioxygen with high affinity and the O(2) adduct is able to scavenge NO. Convincing in vitro and in vivo data indicate that Ngb is involved in neuroprotection during hypoxia and ischemia. The 3D structure of Ngb reveals the presence of a wide internal cavity connecting its heme active site with the bulk. To explore the role of this "tunnel" in the control of ligand binding, we determined the structure of metNgb and NgbCO equilibrated with Xe or Kr. We show four docking sites for Xe (only two for Kr); two of the four Xe sites are within the large cavity. They are only partially conserved in globins, since the two proximal Xe sites identified in myoglobin (Xe1 and Xe2) are absent in Ngb, as well as in cytoglobin. The Xe docking sites in Ngb map a pathway within the protein matrix, leading to the heme, which becomes more accessible in the ligand-bound species. This may be of significance in connection with the redox chemistry that may be the primary function of this hexacoordinate globin.


    Organizational Affiliation

    Department of Biochemical Sciences A.Rossi-Fanelli, University of Rome La Sapienza, Rome, Italy.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NeuroglobinA154Mus musculusMutation(s): 2 
Gene Names: Ngb
Find proteins for Q9ER97 (Mus musculus)
Explore Q9ER97 
Go to UniProtKB:  Q9ER97
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
XE
Query on XE

Download CCD File 
A
XENON
Xe
FHNFHKCVQCLJFQ-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.83α = 90
b = 88.83β = 90
c = 110.926γ = 120
Software Package:
Software NamePurpose
MxCuBEdata collection
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
REFMACphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-10-17
    Changes: Data collection, Database references