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RanBPM, a novel interaction partner of the brain-specific protein p42IP4/centaurin alpha-1

Andrea Haase1, Caroline Nordmann, Fariba Sedehizade

  • 1Institut für Neurobiochemie, Medizinische Fakultät der Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany.

Journal of Neurochemistry
|February 27, 2008
PubMed

Insights

Researchers discovered that the brain protein p42(IP4) interacts with Ran binding protein in microtubule-organizing center (RanBPM). This interaction, crucial for synaptic plasticity, is modulated by inositol tetrakisphosphate (IP4).

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • The protein p42(IP4), also known as Centaurin alpha-1, is abundant in the brain and binds to phosphatidylinositol 3,4,5-trisphosphate and inositol 1,3,4,5-tetrakisphosphate (Ins(1,3,4,5)P(4); IP4).
  • The precise molecular function of p42(IP4), which shuttles between cellular compartments, remains largely unknown.
  • Ran binding protein in microtubule-organizing center (RanBPM) is a ubiquitously expressed protein that functions as a scaffold and modulator.

Purpose of the Study:

  • To identify novel interaction partners of p42(IP4).
  • To elucidate the molecular mechanisms and functional implications of the p42(IP4)-RanBPM interaction.
  • To investigate the role of this interaction in cellular processes like synaptic plasticity.

Main Methods:

  • In vitro and in vivo interaction studies using endogenous proteins from rat brain.
  • Co-localization experiments in transfected HEK 293 cells.
  • Inhibition assays using stereoselective isomers of Ins(1,3,4,5)P(4).
  • Domain mapping to identify interacting regions (SPRY domain of RanBPM, ARFGAP domain of p42(IP4)).

Main Results:

  • A novel interaction between p42(IP4) and RanBPM was identified and confirmed both in vitro and in vivo.
  • The interaction was observed between endogenous proteins in rat brain and co-localization in HEK 293 cells.
  • D-Ins(1,3,4,5)P(4) specifically and concentration-dependently inhibited the p42(IP4)-RanBPM interaction.
  • The SPRY domain of RanBPM and the ARFGAP domain of p42(IP4) were implicated in the interaction.

Conclusions:

  • RanBPM is a novel interaction partner of p42(IP4).
  • The interaction is regulated by D-Ins(1,3,4,5)P(4) and involves specific protein domains.
  • Given their shared involvement in dendritic differentiation, RanBPM may modulate p42(IP4) function in synaptic plasticity.

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