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Functional model of metabolite gating by human voltage-dependent anion channel 2

Andras J Bauer1, Simone Gieschler, Kathryn M Lemberg

  • 1Howard Hughes Medical Institute, Department of Biological Sciences, New York, New York 10027, United States.

Biochemistry
|March 24, 2011
PubMed

Insights

This study investigates voltage-dependent anion channel 2 (VDAC2) and its interaction with erastin. Erastin increases VDAC2 liposome permeability, requiring the N-terminal region for this effect.

Area of Science:

  • Mitochondrial biology
  • Ion channel function
  • Molecular mechanisms of cell death

Background:

  • Voltage-dependent anion channels (VDACs) regulate mitochondrial outer membrane permeability and are implicated in cell death.
  • Human VDAC2 (hVDAC2) function and structure are poorly characterized, unlike hVDAC1.
  • Erastin, a quinazolinone, selectively kills tumor cells with mutant RAS and binds to hVDAC2.

Purpose of the Study:

  • To establish an in vitro system for functional and structural studies of hVDAC2.
  • To investigate the interaction between hVDAC2 and its modulator, erastin.

Main Methods:

  • Development of an in vitro system for hVDAC2 investigation.
  • Liposome-based permeability assays.
  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • Erastin treatment increases the permeability of VDAC2 liposomes to NADH.
  • This erastin-induced permeability increase is dependent on the amino-terminal region of VDAC2.
  • Solid-state NMR confirmed the folded state of the VDAC2-liposome complex.

Conclusions:

  • The developed in vitro system enables functional and structural characterization of hVDAC2.
  • Erastin modulates VDAC2 function by increasing liposome permeability, mediated by its N-terminal region.
  • These findings provide insights into the role of VDAC2 in cellular processes and its interaction with small molecules.

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