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Published on: August 10, 2021
Physiological shedding and C-terminal proteolytic processing of TMEM106B
Sebastian Held1, Christian Erck2, Susanna Kemppainen3
1Institute of Biochemistry, Christian-Albrechts-University Kiel, Olshausenstrasse 40, 24118 Kiel, Germany.
Genetic variants in TMEM106B are linked to neurodegeneration. This study reveals lysosomal cysteine proteases generate and trim the TMEM106B luminal domain, a key step in understanding fibril formation in frontotemporal degeneration.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Genetic variants in TMEM106B are associated with neurodegenerative diseases, particularly frontotemporal degeneration.
- The luminal domain of TMEM106B can form amyloid-like fibrils, but its physiological generation and processing proteases are unknown.
Purpose of the Study:
- To investigate the physiological generation and proteolytic processing of the TMEM106B luminal domain.
- To identify the specific proteases involved in shedding and trimming of TMEM106B.
Main Methods:
- Development of a commercially available antibody against the TMEM106B luminal domain.
- Survey of proteolytic processing in cellular and TMEM106B-related mouse models.
- Detection of fibrillary TMEM106B in human autopsy material.
Main Results:
- The TMEM106B luminal domain is generated by multiple lysosomal cysteine-type proteases.
- Cysteine-type proteases were found to perform additional C-terminal trimming of the luminal domain.
- Fibrillary TMEM106B was detected in human autopsy samples.
Conclusions:
- Lysosomal cysteine proteases are key players in the processing of TMEM106B.
- Understanding TMEM106B processing is crucial for elucidating mechanisms of fibril formation in neurodegeneration.
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