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A globin for the brain.

M Brunori1, B Vallone

  • 1Istituto Pasteur-Fondazione Cenci Bolognetti and Department of Biochemical Sciences, University of Rome La Sapienza, Rome, Italy. maurizio.brunori@uniroma1.it

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|November 2, 2006
PubMed
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Neuroglobin, a brain protein, offers neuroprotection against hypoxia and ischemia. Its ligand-binding conformational changes suggest a role as a stress-responsive sensor in brain signal transduction.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathophysiology

Background:

  • Neuroglobin is a myoglobin-like hemeprotein discovered in the brain.
  • It plays a role in neuroprotection against hypoxia and ischemia.
  • Overexpression aids stroke recovery in animal models.

Purpose of the Study:

  • To investigate the neuroprotective mechanisms of neuroglobin.
  • To understand its structural and functional properties.
  • To explore its potential role in brain signal transduction.

Main Methods:

  • Structural studies of neuroglobin.
  • In vitro and in vivo experiments on neuroprotection.
  • Analysis of ligand binding (O2, CO, NO) and conformational changes.
  • Investigation of interactions with G-proteins.

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Main Results:

  • Neuroglobin exhibits a typical globin fold and reversibly binds O2, CO, and NO.
  • Ligand binding induces significant conformational changes in neuroglobin.
  • Neuroglobin may act as an O2/NO ratio sensor, regulating GDP/GTP exchange via G-protein complexation.

Conclusions:

  • Neuroglobin is a stress-responsive sensor involved in brain signal transduction.
  • Its function is mediated by ligand-induced conformational changes.
  • It is unlikely to be involved in O2 transport but rather in cellular signaling pathways.