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A cholesterol analogue induces an oligomeric reorganization of VDAC

DOI: 10.1016/j.bpj.2019.01.031 DOI Help

Authors: Fraser G. Ferens (University of Manitoba) , Trushar R. Patel (University of Lethbridge; University of Alberta; University of Calgary) , George Orriss (University of Manitoba) , Deborah A. Court (University of Manitoba) , Jörg Stetefeld (University of Manitoba)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Biophysical Journal

State: Published (Approved)
Published: February 2019
Diamond Proposal Number(s): 16028

Abstract: The oligomeric organization of the voltage-dependent anion-selective channel (VDAC) and its interactions with hexokinase play integral roles in mitochondrially mediated apoptotic signaling. Various small to large assemblies of VDAC are observed in mitochondrial outer membranes but they do not predominate in detergent solubilized VDAC samples. In this study, a cholesterol analogue, cholesteryl-hemisuccinate (CHS), was shown induce the formation of detergent soluble VDAC multimers. The various oligomeric states of VDAC induced by the addition of CHS were deciphered through an integrated biophysics approach using microscale thermophoresis, analytical ultracentrifugation and size exclusion chromatography-small angle X-ray scattering. Furthermore, CHS stabilizes the interaction between VDAC and hexokinase (Kd of 27 ± 6 μM), confirming the biological relevance of oligomers generated. Thus, sterols such as cholesterol in higher eukaryotes or ergosterol in fungi may regulate VDAC oligomeric state and may provide a potential target for the modulation of apoptotic signaling by effecting VDAC-VDAC and VDAC-hexokinase interactions. In addition, the integrated biophysical approach described provides a powerful platform for the study of membrane protein complexes in solution.

Subject Areas: Biology and Bio-materials

Beamlines: B21-High Throughput SAXS