Selective clearance of the inner nuclear membrane protein emerin by vesicular transport during ER stress

Buchwalter A, Schulte R, Tsai H, Capitanio J, Hetzer M. 2019. Selective clearance of the inner nuclear membrane protein emerin by vesicular transport during ER stress. eLife. 8, e49796.

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Journal Article | Published | English

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Author
Buchwalter, Abigail; Schulte, Roberta; Tsai, Hsiao; Capitanio, Juliana; Hetzer, MartinISTA
Abstract
The inner nuclear membrane (INM) is a subdomain of the endoplasmic reticulum (ER) that is gated by the nuclear pore complex. It is unknown whether proteins of the INM and ER are degraded through shared or distinct pathways in mammalian cells. We applied dynamic proteomics to profile protein half-lives and report that INM and ER residents turn over at similar rates, indicating that the INM’s unique topology is not a barrier to turnover. Using a microscopy approach, we observed that the proteasome can degrade INM proteins in situ. However, we also uncovered evidence for selective, vesicular transport-mediated turnover of a single INM protein, emerin, that is potentiated by ER stress. Emerin is rapidly cleared from the INM by a mechanism that requires emerin’s LEM domain to mediate vesicular trafficking to lysosomes. This work demonstrates that the INM can be dynamically remodeled in response to environmental inputs.
Publishing Year
Date Published
2019-10-10
Journal Title
eLife
Volume
8
Article Number
e49796
ISSN
IST-REx-ID

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Buchwalter A, Schulte R, Tsai H, Capitanio J, Hetzer M. Selective clearance of the inner nuclear membrane protein emerin by vesicular transport during ER stress. eLife. 2019;8. doi:10.7554/elife.49796
Buchwalter, A., Schulte, R., Tsai, H., Capitanio, J., & Hetzer, M. (2019). Selective clearance of the inner nuclear membrane protein emerin by vesicular transport during ER stress. ELife. eLife Sciences Publications. https://doi.org/10.7554/elife.49796
Buchwalter, Abigail, Roberta Schulte, Hsiao Tsai, Juliana Capitanio, and Martin Hetzer. “Selective Clearance of the Inner Nuclear Membrane Protein Emerin by Vesicular Transport during ER Stress.” ELife. eLife Sciences Publications, 2019. https://doi.org/10.7554/elife.49796.
A. Buchwalter, R. Schulte, H. Tsai, J. Capitanio, and M. Hetzer, “Selective clearance of the inner nuclear membrane protein emerin by vesicular transport during ER stress,” eLife, vol. 8. eLife Sciences Publications, 2019.
Buchwalter A, Schulte R, Tsai H, Capitanio J, Hetzer M. 2019. Selective clearance of the inner nuclear membrane protein emerin by vesicular transport during ER stress. eLife. 8, e49796.
Buchwalter, Abigail, et al. “Selective Clearance of the Inner Nuclear Membrane Protein Emerin by Vesicular Transport during ER Stress.” ELife, vol. 8, e49796, eLife Sciences Publications, 2019, doi:10.7554/elife.49796.
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