Contact of mobile cis-Golgi network with ER exit sites executes COPI-mediated receptor recycling
Abstract
COPI-mediated retrograde transport is essential for maintaining homeostasis between the endoplasmic reticulum (ER) and the Golgi in eukaryotic cells. However, its spatiotemporal dynamics remain unclear. In budding yeast, ER export occurs through a hug-and-kiss mechanism, wherein mobile cis-Golgi network (CGN) elements transiently approach ER exit sites (ERES) to capture cargo before departing to deliver it to the Golgi. Here, using high-resolution 3D and 4D live imaging, we show that the COPI-mediated recycling of a cargo receptor from the CGN back to the ER occurs during the hug-and-kiss event. Furthermore, this recycling is complete before the CGN detaches from the ERES, suggesting that COPI-mediated retrograde transport is spatiotemporally coupled to ER export during a single and transient CGN-ERES association. Consistent with this model, when COPI function is impaired, the receptor fails to return efficiently to the ER and instead remains in the CGN after separation from the ERES. Additionally, COPI impairment prolonged CGN-ERES association, suggesting that COPI function also facilitates CGN detachment from ERES. Thus, we propose that rapid COPI-mediated recycling drives CGN maturation directly at the ERES interface, enabling the CGN to detach and proceed along the secretory pathway.
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BibTeX
@misc{rodriguezprieto2026contact,
title = {{Contact of mobile cis-Golgi network with ER exit sites executes COPI-mediated receptor recycling}},
author = {R. Rodriguez-Prieto and Y. Suda and T. Tojima and S. Sabido-Bozo and K. Kurokawa and A. Nakano and M. Muniz},
howpublished = {bioRxiv},
year = {2026},
month = oct,
doi = {10.64898/2026.10.06.756745},
url = {https://www.biorxiv.org/content/10.64898/2026.10.06.756745v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Contact of mobile cis-Golgi network with ER exit sites executes COPI-mediated receptor recycling
AU - R. Rodriguez-Prieto
AU - Y. Suda
AU - T. Tojima
AU - S. Sabido-Bozo
AU - K. Kurokawa
AU - A. Nakano
AU - M. Muniz
PY - 2026
DA - 2026/10/06
PB - bioRxiv
DO - 10.64898/2026.10.06.756745
UR - https://www.biorxiv.org/content/10.64898/2026.10.06.756745v1
AB - COPI-mediated retrograde transport is essential for maintaining homeostasis between the endoplasmic reticulum (ER) and the Golgi in eukaryotic cells. However, its spatiotemporal dynamics remain unclear. In budding yeast, ER export occurs through a hug-and-kiss mechanism, wherein mobile cis-Golgi network (CGN) elements transiently approach ER exit sites (ERES) to capture cargo before departing to deliver it to the Golgi. Here, using high-resolution 3D and 4D live imaging, we show that the COPI-mediated recycling of a cargo receptor from the CGN back to the ER occurs during the hug-and-kiss event. Furthermore, this recycling is complete before the CGN detaches from the ERES, suggesting that COPI-mediated retrograde transport is spatiotemporally coupled to ER export during a single and transient CGN-ERES association. Consistent with this model, when COPI function is impaired, the receptor fails to return efficiently to the ER and instead remains in the CGN after separation from the ERES. Additionally, COPI impairment prolonged CGN-ERES association, suggesting that COPI function also facilitates CGN detachment from ERES. Thus, we propose that rapid COPI-mediated recycling drives CGN maturation directly at the ERES interface, enabling the CGN to detach and proceed along the secretory pathway.
ER -