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Specific Post-Translational Modifications of VDAC3 in ALS-SOD1 Model Cells Identified by High-Resolution Mass Spectrometry

Authors :
Maria Gaetana Giovanna PittalĂ 
Simona Reina
Stefano Conti Nibali
Annamaria Cucina
Salvatore Antonio Maria Cubisino
Vincenzo Cunsolo
Giuseppe Federico Amodeo
Salvatore Foti
Vito De Pinto
Rosaria Saletti
Angela Messina
Source :
International Journal of Molecular Sciences; Volume 23; Issue 24; Pages: 15853
Publication Year :
2022
Publisher :
Multidisciplinary Digital Publishing Institute, 2022.

Abstract

Damage induced by oxidative stress is a key driver of the selective motor neuron death in amyotrophic lateral sclerosis (ALS). Mitochondria are among the main producers of ROS, but they also suffer particularly from their harmful effects. Voltage-dependent anion-selective channels (VDACs) are the most represented proteins of the outer mitochondrial membrane where they form pores controlling the permeation of metabolites responsible for mitochondrial functions. For these reasons, VDACs contribute to mitochondrial quality control and the entire energy metabolism of the cell. In this work we assessed in an ALS cell model whether disease-related oxidative stress induces post-translational modifications (PTMs) in VDAC3, a member of the VDAC family of outer mitochondrial membrane channel proteins, known for its role in redox signaling. At this end, protein samples enriched in VDACs were prepared from mitochondria of an ALS model cell line, NSC34 expressing human SOD1G93A, and analyzed by nUHPLC/High-Resolution nESI-MS/MS. Specific over-oxidation, deamidation, succination events were found in VDAC3 from ALS-related NSC34-SOD1G93A but not in non-ALS cell lines. Additionally, we report evidence that some PTMs may affect VDAC3 functionality. In particular, deamidation of Asn215 alone alters single channel behavior in artificial membranes. Overall, our results suggest modifications of VDAC3 that can impact its protective role against ROS, which is particularly important in the ALS context. Data are available via ProteomeXchange with identifier PXD036728.

Details

Language :
English
ISSN :
14220067
Database :
OpenAIRE
Journal :
International Journal of Molecular Sciences; Volume 23; Issue 24; Pages: 15853
Accession number :
edsair.doi.dedup.....5d4fecee819c2ad9283c0cc8fd2e65ef
Full Text :
https://doi.org/10.3390/ijms232415853