ER-Golgi contact sites regulate lipid homeostasis and trafficking across the trans-Golgi network. However, their molecular nature is elusive. In this issue, Venditti et al. (2019. https://doi.org/10.1083/jcb.201812020 and https://doi.org/10.1083/jcb.201812021) shine new light on the molecular determinants coupling lipid exchange and cargo exit with maintenance of ER-Golgi contacts.
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http://dx.doi.org/10.1083/jcb.201901039 | DOI Listing |
Elife
August 2024
Cell and Chemical Biology, Oncode Institute, Leiden University Medical Center, Leiden, Netherlands.
Numerous lipids are heterogeneously distributed among organelles. Most lipid trafficking between organelles is achieved by a group of lipid transfer proteins (LTPs) that carry lipids using their hydrophobic cavities. The human genome encodes many intracellular LTPs responsible for lipid trafficking and the function of many LTPs in defining cellular lipid levels and distributions is unclear.
View Article and Find Full Text PDFBiochem Biophys Res Commun
June 2024
Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan. Electronic address:
The transport of ceramide from the endoplasmic reticulum (ER) to the Golgi is a key step in the synthesis of complex sphingolipids, the main building blocks of the plasma membrane. In yeast, ceramide is transported to the Golgi either through ATP-dependent COPII vesicles of the secretory pathway or by ATP-independent non-vesicular transport that involves tethering proteins at ER-Golgi membrane contact sites. Studies in both mammalian and yeast cells reported that vesicular transport mainly carries ceramide containing very long chain fatty acids, while the main mammalian non-vesicular ceramide transport protein CERT only transports ceramides containing short chain fatty acids.
View Article and Find Full Text PDFElife
March 2024
Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Japan.
Biophys Rep
August 2023
State Key Laboratory of Membrane Biology, Beijing 100101, China.
Elife
March 2024
Live Cell Super-Resolution Imaging Research Team, RIKEN Center for Advanced Photonics, Wako, Japan.
Cargo traffic through the Golgi apparatus is mediated by cisternal maturation, but it remains largely unclear how the -cisternae, the earliest Golgi sub-compartment, is generated and how the Golgi matures into the -Golgi network (TGN). Here, we use high-speed and high-resolution confocal microscopy to analyze the spatiotemporal dynamics of a diverse set of proteins that reside in and around the Golgi in budding yeast. We find many mobile punctate structures that harbor yeast counterparts of mammalian endoplasmic reticulum (ER)-Golgi intermediate compartment (ERGIC) proteins, which we term 'yeast ERGIC'.
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