Positioning of endoplasmic reticulum exit sites around the Golgi depends on BicaudalD2 and Rab6 activity. 2021

Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
Tel-Aviv University, Sackler School of Medicine, Tel Aviv, Israel.

The endoplasmic reticulum (ER) is involved in biogenesis, modification and transport of secreted and membrane proteins. The ER membranes are spread throughout the cell cytoplasm as well as the export domains known as ER exit sites (ERES). A subpopulation of ERES is centrally localized proximal to the Golgi apparatus. The significance of this subpopulation on ER-to-Golgi transport remains unclear. Transport carriers (TCs) form at the ERES via a COPII-dependent mechanism and move to Golgi on microtubule (MT) tracks. It was shown previously that ERES are distributed along MTs and undergo chaotic short-range movements and sporadic rapid long-range movements. The long-range movements of ERES are impaired by either depolymerization of MTs or inhibition of dynein, suggesting that ERES central concentration is mediated by dynein activity. We demonstrate that the processive movements of ERES are frequently coupled with the TC departure. Using the Sar1a[H79G]-induced ERES clustering at the perinuclear region, we identified BicaudalD2 (BicD2) and Rab6 as components of the dynein adaptor complex which drives perinuclear ERES concentration at the cell center. BicD2 partially colocalized with ERES and with TC. Peri-Golgi ERES localization was significantly affected by inhibition of BicD2 function with its N-terminal fragment or inhibition of Rab6 function with its dominant-negative mutant. Golgi accumulation of secretory protein was delayed by inhibition of Rab6 and BicD2. Thus, we conclude that a BicD2/Rab6 dynein adaptor is required for maintenance of Golgi-associated ERES. We propose that Golgi-associated ERES may enhance the efficiency of the ER-to-Golgi transport.

UI MeSH Term Description Entries
D007425 Intracellular Membranes Thin structures that encapsulate subcellular structures or ORGANELLES in EUKARYOTIC CELLS. They include a variety of membranes associated with the CELL NUCLEUS; the MITOCHONDRIA; the GOLGI APPARATUS; the ENDOPLASMIC RETICULUM; LYSOSOMES; PLASTIDS; and VACUOLES. Membranes, Intracellular,Intracellular Membrane,Membrane, Intracellular
D008870 Microtubules Slender, cylindrical filaments found in the cytoskeleton of plant and animal cells. They are composed of the protein TUBULIN and are influenced by TUBULIN MODULATORS. Microtubule
D004721 Endoplasmic Reticulum A system of cisternae in the CYTOPLASM of many cells. In places the endoplasmic reticulum is continuous with the plasma membrane (CELL MEMBRANE) or outer membrane of the nuclear envelope. If the outer surfaces of the endoplasmic reticulum membranes are coated with ribosomes, the endoplasmic reticulum is said to be rough-surfaced (ENDOPLASMIC RETICULUM, ROUGH); otherwise it is said to be smooth-surfaced (ENDOPLASMIC RETICULUM, SMOOTH). (King & Stansfield, A Dictionary of Genetics, 4th ed) Ergastoplasm,Reticulum, Endoplasmic
D006056 Golgi Apparatus A stack of flattened vesicles that functions in posttranslational processing and sorting of proteins, receiving them from the rough ENDOPLASMIC RETICULUM and directing them to secretory vesicles, LYSOSOMES, or the CELL MEMBRANE. The movement of proteins takes place by transfer vesicles that bud off from the rough endoplasmic reticulum or Golgi apparatus and fuse with the Golgi, lysosomes or cell membrane. (From Glick, Glossary of Biochemistry and Molecular Biology, 1990) Golgi Complex,Apparatus, Golgi,Complex, Golgi
D001692 Biological Transport The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments. Transport, Biological,Biologic Transport,Transport, Biologic
D021381 Protein Transport The process of moving proteins from one cellular compartment (including extracellular) to another by various sorting and transport mechanisms such as gated transport, protein translocation, and vesicular transport. Cellular Protein Targeting,Gated Protein Transport,Protein Targeting, Cellular,Protein Translocation,Transmembrane Protein Transport,Vesicular Protein Transport,Protein Localization Processes, Cellular,Protein Sorting,Protein Trafficking,Protein Transport, Gated,Protein Transport, Transmembrane,Protein Transport, Vesicular,Traffickings, Protein

Related Publications

Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
April 1996, Molecular biology of the cell,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
July 2020, iScience,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
February 2001, The Journal of neuroscience : the official journal of the Society for Neuroscience,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
November 2013, The Plant cell,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
January 2024, The Plant journal : for cell and molecular biology,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
April 2013, Cellular microbiology,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
September 2019, FEBS letters,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
August 2015, Current opinion in cell biology,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
January 2006, Molecular biology of the cell,
Olga Shomron, and Koret Hirschberg, and Anton Burakov, and Rimma Kamentseva, and Elena Kornilova, and Elena Nadezhdina, and Ilya Brodsky
June 2018, Traffic (Copenhagen, Denmark),
Copied contents to your clipboard!