2. Academic Validation
  3. Moyamoya disease patient mutations in the RING domain of RNF213 reduce its ubiquitin ligase activity and enhance NFκB activation and apoptosis in an AAA+ domain-dependent manner

Moyamoya disease patient mutations in the RING domain of RNF213 reduce its ubiquitin ligase activity and enhance NFκB activation and apoptosis in an AAA+ domain-dependent manner

  • Biochem Biophys Res Commun. 2020 May 7;525(3):668-674. doi: 10.1016/j.bbrc.2020.02.024.
Midori Takeda 1,  Tohru Tezuka 2,  Minsoo Kim 3,  Jungmi Choi 1,  Yuki Oichi 4,  Hatasu Kobayashi 5,  Kouji H Harada 6,  Tsunehiro Mizushima 7,  Shigeru Taketani 8,  Akio Koizumi 9,  Shohab Youssefian 8
Affiliations

Affiliations

  • 1 Laboratory of Molecular Biosciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
  • 2 Laboratory of Molecular Biosciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Human Biosciences Unit for the Top Global Course, Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, Japan. Electronic address: [email protected].
  • 3 The Hakubi Center for Advanced Research, Kyoto University, Kyoto, Japan.
  • 4 Laboratory of Molecular Biosciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Department of Neurosurgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
  • 5 Department of Environmental and Molecular Medicine, Graduate School of Medicine, Mie University, Mie, Japan.
  • 6 Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
  • 7 Graduate School of Life Science, University of Hyogo, Hyogo, Japan.
  • 8 Laboratory of Molecular Biosciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
  • 9 Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Institute of Public Health and Welfare Research, Kyoto, Japan.
PMID: 32139119 DOI: 10.1016/j.bbrc.2020.02.024
Abstract

Moyamoya disease (MMD) is a cerebrovascular disease characterized by progressive occlusion of the internal carotid arteries. Genetic studies originally identified RNF213 as an MMD susceptibility gene that encodes a large 591 kDa protein with a functional RING domain and dual AAA+ ATPase domains. As the functions of RNF213 and its relationship to MMD onset are unknown, we set out to characterize the ubiquitin ligase activity of RNF213, and the effects of MMD patient mutations on these activities and on other cellular processes. In vitro ubiquitination assays, using the RNF213 RING domain, identified Ubc13/Uev1A as a key ubiquitin conjugating Enzyme that together generate K63-linked polyubiquitin chains. However, nearly all MMD patient mutations in the RING domain greatly reduced this activity. When full-length proteins were overexpressed in HEK293T cells, patient mutations that abolished the ubiquitin ligase activities conversely enhanced nuclear factor κB (NFκB) activation and induced Apoptosis accompanied with Caspase-3 activation. These induced activities were dependent on the RNF213 AAA+ domain. Our results suggest that the NFκB- and apoptosis-inducing functions of RNF213 may be negatively regulated by its ubiquitin ligase activity and that disruption of this regulation could contribute towards MMD onset.

Keywords

Apoptosis; Moyamoya disease; NFκB; RNF213; Ubiquitin ligase; Ubiquitination.

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