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Related Experiment Videos

GABAC receptor sensitivity is modulated by interaction with MAP1B.

D Billups1, J G Hanley, M Orme

  • 1Laboratory for Molecular Cell Biology, Department of Pharmacology, University College London, London, WC1E 6BT, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 11, 2000
PubMed
Summary
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The microtubule-associated protein 1B (MAP1B) anchors GABA(C) receptors via rho subunits. This interaction lowers receptor sensitivity, modulating visual processing in retinal bipolar cells.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • GABA(C) receptors, containing rho subunits, are crucial for feedback inhibition in the retina.
  • Microtubule-associated protein 1B (MAP1B) was previously identified as a rho1 subunit anchoring protein.

Purpose of the Study:

  • To investigate the structural basis of the MAP1B-rho1 interaction.
  • To determine the functional significance of this interaction on GABA(C) receptor activity.

Main Methods:

  • Analysis of the C-terminal region of rho1 and rho2 subunits for MAP1B binding.
  • Experimental disruption of the MAP1B-rho interaction in retinal bipolar cells.

Main Results:

  • A 12-amino acid sequence at the C terminus of the rho1/rho2 intracellular loop mediates MAP1B binding.

Related Experiment Videos

  • Disrupting the MAP1B-rho interaction decreased GABA(C) receptor EC(50) in bipolar cells.
  • This disruption doubled GABA(C) receptor current at low GABA concentrations but did not affect maximal current.

    • Conclusions:

    • Cytoskeletal anchoring by MAP1B reduces GABA(C) receptor sensitivity.
    • This mechanism provides a pathway for functional modulation of GABA(C) receptor-mediated inhibition in the retina.