Distinct role of TGN-resident clathrin adaptors for Vps21p activation in the TGN-endosome trafficking pathway

Nagano M, Aoshima K, Shimamura H, Siekhaus DE, Toshima JY, Toshima J. 2023. Distinct role of TGN-resident clathrin adaptors for Vps21p activation in the TGN-endosome trafficking pathway. Journal of Cell Science. 136(17), jcs261448.

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Author
Nagano, Makoto; Aoshima, Kaito; Shimamura, Hiroki; Siekhaus, Daria EISTA ; Toshima, Junko Y.; Toshima, Jiro
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Abstract
Clathrin-mediated vesicle trafficking plays central roles in post-Golgi transport. In yeast (Saccharomyces cerevisiae), the AP-1 complex and GGA adaptors are predicted to generate distinct transport vesicles at the trans-Golgi network (TGN), and the epsin-related proteins Ent3p and Ent5p (collectively Ent3p/5p) act as accessories for these adaptors. Recently, we showed that vesicle transport from the TGN is crucial for yeast Rab5 (Vps21p)-mediated endosome formation, and that Ent3p/5p are crucial for this process, whereas AP-1 and GGA adaptors are dispensable. However, these observations were incompatible with previous studies showing that these adaptors are required for Ent3p/5p recruitment to the TGN, and thus the overall mechanism responsible for regulation of Vps21p activity remains ambiguous. Here, we investigated the functional relationships between clathrin adaptors in post-Golgi-mediated Vps21p activation. We show that AP-1 disruption in the ent3Δ5Δ mutant impaired transport of the Vps21p guanine nucleotide exchange factor Vps9p transport to the Vps21p compartment and severely reduced Vps21p activity. Additionally, GGA adaptors, the phosphatidylinositol-4-kinase Pik1p and Rab11 GTPases Ypt31p and Ypt32p were found to have partially overlapping functions for recruitment of AP-1 and Ent3p/5p to the TGN. These findings suggest a distinct role of clathrin adaptors for Vps21p activation in the TGN–endosome trafficking pathway.
Publishing Year
Date Published
2023-09-01
Journal Title
Journal of Cell Science
Volume
136
Issue
17
Article Number
jcs261448
ISSN
eISSN
IST-REx-ID

Cite this

Nagano M, Aoshima K, Shimamura H, Siekhaus DE, Toshima JY, Toshima J. Distinct role of TGN-resident clathrin adaptors for Vps21p activation in the TGN-endosome trafficking pathway. Journal of Cell Science. 2023;136(17). doi:10.1242/jcs.261448
Nagano, M., Aoshima, K., Shimamura, H., Siekhaus, D. E., Toshima, J. Y., & Toshima, J. (2023). Distinct role of TGN-resident clathrin adaptors for Vps21p activation in the TGN-endosome trafficking pathway. Journal of Cell Science. The Company of Biologists. https://doi.org/10.1242/jcs.261448
Nagano, Makoto, Kaito Aoshima, Hiroki Shimamura, Daria E Siekhaus, Junko Y. Toshima, and Jiro Toshima. “Distinct Role of TGN-Resident Clathrin Adaptors for Vps21p Activation in the TGN-Endosome Trafficking Pathway.” Journal of Cell Science. The Company of Biologists, 2023. https://doi.org/10.1242/jcs.261448.
M. Nagano, K. Aoshima, H. Shimamura, D. E. Siekhaus, J. Y. Toshima, and J. Toshima, “Distinct role of TGN-resident clathrin adaptors for Vps21p activation in the TGN-endosome trafficking pathway,” Journal of Cell Science, vol. 136, no. 17. The Company of Biologists, 2023.
Nagano M, Aoshima K, Shimamura H, Siekhaus DE, Toshima JY, Toshima J. 2023. Distinct role of TGN-resident clathrin adaptors for Vps21p activation in the TGN-endosome trafficking pathway. Journal of Cell Science. 136(17), jcs261448.
Nagano, Makoto, et al. “Distinct Role of TGN-Resident Clathrin Adaptors for Vps21p Activation in the TGN-Endosome Trafficking Pathway.” Journal of Cell Science, vol. 136, no. 17, jcs261448, The Company of Biologists, 2023, doi:10.1242/jcs.261448.
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