Download MendeleyStructural analysis of the overoxidized Cu/Zn-superoxide dismutase in ROS-induced ALS filament formation.
Baek, Y., Woo, T.G., Ahn, J., Lee, D., Kwon, Y., Park, B.J., Ha, N.C.(2022) Commun Biol 5: 1085-1085
- PubMed: 36224351
- DOI: https://doi.org/10.1038/s42003-022-04017-0
- Primary Citation of Related Structures:
7FB6, 7FB9 - PubMed Abstract:
Eukaryotic Cu, Zn-superoxide dismutase (SOD1) is primarily responsible for cytotoxic filament formation in amyotrophic lateral sclerosis (ALS) neurons. Two cysteine residues in SOD1 form an intramolecular disulfide bond. This study aims to explore the molecular mechanism of SOD1 filament formation by cysteine overoxidation in sporadic ALS (sALS). In this study, we determined the crystal structure of the double mutant (C57D/C146D) SOD1 that mimics the overoxidation of the disulfide-forming cysteine residues. The structure revealed the open and relaxed conformation of loop IV containing the mutated Asp57. The double mutant SOD1 produced more contagious filaments than wild-type protein, promoting filament formation of the wild-type SOD1 proteins. Importantly, we further found that HOCl treatment to the wild-type SOD1 proteins facilitated their filament formation. We propose a feasible mechanism for SOD1 filament formation in ALS from the wild-type SOD1, suggesting that overoxidized SOD1 is a triggering factor of sALS. Our findings extend our understanding of other neurodegenerative disorders associated with ROS stresses at the molecular level.
Organizational Affiliation:
Department of Agricultural Biotechnology, and Research Institute of Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Republic of Korea.
