1
|
Park SH, Han J, Jeong BC, Song JH, Jang SH, Jeong H, Kim BH, Ko YG, Park ZY, Lee KE, Hyun J, Song HK. Structure and activation of the RING E3 ubiquitin ligase TRIM72 on the membrane. Nat Struct Mol Biol 2023; 30:1695-1706. [PMID: 37770719 PMCID: PMC10643145 DOI: 10.1038/s41594-023-01111-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 08/16/2023] [Indexed: 09/30/2023]
Abstract
Defects in plasma membrane repair can lead to muscle and heart diseases in humans. Tripartite motif-containing protein (TRIM)72 (mitsugumin 53; MG53) has been determined to rapidly nucleate vesicles at the site of membrane damage, but the underlying molecular mechanisms remain poorly understood. Here we present the structure of Mus musculus TRIM72, a complete model of a TRIM E3 ubiquitin ligase. We demonstrated that the interaction between TRIM72 and phosphatidylserine-enriched membranes is necessary for its oligomeric assembly and ubiquitination activity. Using cryogenic electron tomography and subtomogram averaging, we elucidated a higher-order model of TRIM72 assembly on the phospholipid bilayer. Combining structural and biochemical techniques, we developed a working molecular model of TRIM72, providing insights into the regulation of RING-type E3 ligases through the cooperation of multiple domains in higher-order assemblies. Our findings establish a fundamental basis for the study of TRIM E3 ligases and have therapeutic implications for diseases associated with membrane repair.
Collapse
Affiliation(s)
- Si Hoon Park
- Department of Life Sciences, Korea University, Seoul, South Korea
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Juhyun Han
- Department of Life Sciences, Korea University, Seoul, South Korea
| | - Byung-Cheon Jeong
- Department of Life Sciences, Korea University, Seoul, South Korea
- CSL Seqirus, Waltham, MA, USA
| | - Ju Han Song
- Department of Life Sciences, Korea University, Seoul, South Korea
- Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, South Korea
| | - Se Hwan Jang
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Hyeongseop Jeong
- Center for Electron Microscopy Research, Korea Basic Science Institute, Cheongju-si, South Korea
| | - Bong Heon Kim
- Department of Life Sciences, Korea University, Seoul, South Korea
| | - Young-Gyu Ko
- Department of Life Sciences, Korea University, Seoul, South Korea
| | - Zee-Yong Park
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Kyung Eun Lee
- Advanced Analysis Center, Korea Institute of Science and Technology, Seoul, South Korea
| | - Jaekyung Hyun
- School of Pharmacy, Sungkyunkwan University, Suwon, South Korea
| | - Hyun Kyu Song
- Department of Life Sciences, Korea University, Seoul, South Korea.
| |
Collapse
|
2
|
Alberti S, Carra S. Quality Control of Membraneless Organelles. J Mol Biol 2018; 430:4711-4729. [PMID: 29758260 DOI: 10.1016/j.jmb.2018.05.013] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/04/2018] [Accepted: 05/04/2018] [Indexed: 02/06/2023]
Abstract
The formation of membraneless organelles (MLOs) by phase separation has emerged as a new way of organizing the cytoplasm and nucleoplasm of cells. Examples of MLOs forming via phase separation are nucleoli in the nucleus and stress granules in the cytoplasm. The main components of these MLOs are macromolecules such as RNAs and proteins. In order to assemble by phase separation, these proteins and RNAs have to undergo many cooperative interactions. These cooperative interactions are supported by specific molecular features within phase-separating proteins, such as multivalency and the presence of disordered domains that promote weak and transient interactions. However, these features also predispose phase-separating proteins to aberrant behavior. Indeed, evidence is emerging for a strong link between phase-separating proteins, MLOs, and age-related diseases. In this review, we discuss recent progress in understanding the formation, properties, and functions of MLOs. We pay special attention to the emerging link between MLOs and age-related diseases, and we explain how changes in the composition and physical properties of MLOs promote their conversion into an aberrant state. Furthermore, we discuss the key role of the protein quality control machinery in regulating the properties and functions of MLOs and thus in preventing age-related diseases.
Collapse
Affiliation(s)
- Simon Alberti
- Max Planck Institute of Molecular Cell Biology and Genetics, 01307 Dresden, Germany.
| | - Serena Carra
- Department of Biomedical, Metabolic and Neural Science, University of Modena and Reggio Emilia, Center for Neuroscience and Neurotechnology, 41125 Modena, Italy.
| |
Collapse
|