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Homocysteine-Thiolactone Modulates Gating of Mitochondrial Voltage-Dependent Anion Channel (VDAC) and Protects It from Induced Oxidative Stress

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Abstract

The gating of the Voltage-Dependent Anion Channel (VDAC) is linked to oxidative stress through increased generation of mitochondrial ROS with increasing mitochondrial membrane potential (ΔΨm). It has been already reported that H2O2 increases the single-channel conductance of VDAC on a bilayer lipid membrane. On the other hand, homocysteine (Hcy) has been reported to induce mitochondria-mediated cell death. It is argued that the thiol-form of homocysteine, HTL could be the plausible molecule responsible for the alteration in the function of proteins, such as VDAC. It is hypothesized that HTL interacts with VDAC that causes functional abnormalities. An investigation was undertaken to study the interaction of HTL with VDAC under H2O2 induced oxidative stress through biophysical and electrophysiological methods. Fluorescence spectroscopic studies indicate that HTL interacts with VDAC, but under induced oxidative stress the effect is prevented partially. Similarly, bilayer electrophysiology studies suggest that HTL shows a reduction in VDAC single-channel conductance, but the effects are partially prevented under an oxidative environment. Gly172 and His181 are predicted through bioinformatics tools to be the most plausible binding residues of HTL in Rat VDAC. The binding of HTL and H2O2 with VDAC appears to be cooperative as per our analysis of experimental data in the light of the Hill-Langmuir equation. The binding energies are estimated to be − 4.7 kcal mol−1 and − 2.8 kcal mol−1, respectively. The present in vitro studies suggest that when mitochondrial VDAC is under oxidative stress, the effects of amino acid metabolites like HTL are suppressed.

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Acknowledgements

T Daniel Tuikhang Koren thanks the University Grants Commission (UGC), New Delhi, India, for providing the Senior Research Fellowship. Both the authors extend their thanks to Jitender Kumar and Rajan Shrivastava for scripting the Python scripts as well as for their valuable suggestions and other technical assists. This work was supported by the Department of Biophysics, University of Delhi South Campus, New Delhi-110021, India.

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Both the authors contributed to the concept, design, and analysis of the work. Materials preparations and data acquisition were performed by T Daniel Tuikhang Koren. Both the authors jointly wrote the manuscript.

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Correspondence to Subhendu Ghosh.

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The authors declare no conflict of interest.

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All animal experiments were performed as per norms of the Institutional Animal Ethics Committee (IAEC) under the supervision of the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA), India (Lic. No.: 48/1AEC/SG/Biophy/UDSC/07.09.2019).

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Koren, T.D.T., Ghosh, S. Homocysteine-Thiolactone Modulates Gating of Mitochondrial Voltage-Dependent Anion Channel (VDAC) and Protects It from Induced Oxidative Stress. J Membrane Biol 255, 79–97 (2022). https://doi.org/10.1007/s00232-022-00215-3

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  • DOI: https://doi.org/10.1007/s00232-022-00215-3

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