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RUFY3 and RUFY4 are ARL8 effectors that promote coupling of endolysosomes to dynein-dynactin

Keren-Kaplan, Tal, Sarić, Amra, Ghosh, Saikat, Williamson, Chad D., Jia, Rui, Li, Yan, Bonifacino, Juan S.·2022·Nature Communications
DOI 10.1038/s41467-022-28952-yPMC PMC8938451

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Abstract

The small GTPase ARL8 associates with endolysosomes, leading to the recruitment of several effectors that couple endolysosomes to kinesins for anterograde transport along microtubules, and to tethering factors for eventual fusion with other organelles. Herein we report the identification of the RU N- and FY VE-domain-containing proteins RUFY3 and RUFY4 as ARL8 effectors that promote coupling of endolysosomes to dynein-dynactin for retrograde transport along microtubules. Using various methodologies, we find that RUFY3 and RUFY4 interact with both GTP-bound ARL8 and dynein-dynactin. In addition, we show that RUFY3 and RUFY4 promote concentration of endolysosomes in the juxtanuclear area of non-neuronal cells, and drive redistribution of endolysosomes from the axon to the soma in hippocampal neurons. The function of RUFY3 in retrograde transport contributes to the juxtanuclear redistribution of endolysosomes upon cytosol alkalinization. These studies thus identify RUFY3 and RUFY4 as ARL8-dependent, dynein-dynactin adaptors or regulators, and highlight the role of ARL8 in the control of both anterograde and retrograde endolysosome transport.

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Authors
Keren-Kaplan, T., Sarić, A., Ghosh, S., Williamson, C. D., Jia, R., Li, Y., & Bonifacino, J. S.
Venue
Nature Communications
Publisher
Springer Science and Business Media LLC
Published
2022-03-21
Volume
13
Issue
1
ISSN
2041-1723
DOI
10.1038/s41467-022-28952-y
PMC
PMC8938451
Cited by
79
References
7
Language
en
Licence
Funders
U.S. Department of Health & Human Services | NIH | Eunice Kennedy Shriver National Institute of Child Health and Human Development (ZIA HD001607)

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