What question did this study set out to answer?

This work aims to clarify the multifunctional roles of RAB1 in trafficking and autophagy.

April 24, 2026Autophagy0 citations

Getting a handle on RAB1: from Golgi trafficking to mitophagy

Key Points

This work aims to clarify the multifunctional roles of RAB1 in trafficking and autophagy.
Mapped the RAB1 interactome to identify its molecular interactions.
Examined RAB1's involvement in ER-to-Golgi trafficking.
Investigated effects of RAB1 loss on autophagy initiation.
RAB1 knockout leads to embryonic lethality and cell death.
Identified that RAB1 interacts with COPII vesicles during trafficking.
Demonstrated early defects in autophagy initiation with RAB1 loss.

Abstract

The small GTPase RAB1 is essential for life. A knockout of RAB1 is not only embryonically lethal, but even triggers cell death in a cultured cell line, underscoring its importance for cellular homeostasis. Previous work has shown that RAB1 plays a key role in protein and membrane trafficking as a player in the ER-to-Golgi trafficking pathway. Here, RAB1 has been shown to interact with COPII vesicles that have left the ER and are arriving at the Golgi. In addition, RAB1 is an essential part of autophagy initiation, where loss of RAB1 leads to defects very early in the pathway. To complicate matters further, there is a non-trivial overlap in phenotype between a Golgi trafficking defect and an autophagy initiation problem, as ATG9A vesicle trafficking and the general importance of the Golgi in autophagy illustrates. Given these hurdles, how would one get a handle on the molecular mechanism of RAB1? In this Punctum, I discuss our recent mapping of a new RAB1 interactome that provides fresh insights into its multifaceted functions.

AIに質問

Bookmark

View Full Paper