In eukaryotic cells, transport between several membrane-bound organelles is mediated by vesicles that bud from one membrane and fuse selectively with another. This proposal focuses on the molecules that catalyze vesicular transport between the endoplasmic reticulum (ER) and Golgi complex in Saccharomyces cerevisiae. Many essential components of this transport pathway have been identified though genetic and biochemical approaches; however the underlying molecular mechanisms remain unclear. Our studies combine molecular genetic approaches with in vitro assays that measure protein transport from the ER to the Golgi complex. This transport reaction proceeds through the biochemically distinct stages of COPII-dependent vesicle budding, Us1p-dependent vesicle tethering and SNARE protein-dependent membrane fusion. We have reproduced these stages with isolated membranes and purified soluble molecules. The long-term goal of my investigation is to reconstitute distinct sub-reactions in ER/Golgi transport with defined protein and lipid fractions for the elucidation of catalytic mechanisms. The objectives of this proposal are to investigate the mechanisms by which the COPII coat sorts specific secretory cargo into vesicles, determine the molecular contacts that functionally tether vesicles to acceptor membranes and devise new assays that monitor sub-reactions in the membrane fusion stage. Many of these fundamental mechanisms in intracellular transport are conserved for multiple trafficking pathways within a species and from yeast to mammals. Therefore, these studies are basic for illuminating endocrine and exocrine secretion and will be of broad importance to medicine.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
2R01GM052549-09
Application #
6610150
Study Section
Cell Development and Function Integrated Review Group (CDF)
Program Officer
Shapiro, Bert I
Project Start
1995-05-01
Project End
2007-04-30
Budget Start
2003-05-01
Budget End
2004-04-30
Support Year
9
Fiscal Year
2003
Total Cost
$424,918
Indirect Cost
Name
Dartmouth College
Department
Biochemistry
Type
Schools of Medicine
DUNS #
041027822
City
Hanover
State
NH
Country
United States
Zip Code
03755
Anderson, Nadine S; Mukherjee, Indrani; Bentivoglio, Christine M et al. (2017) The Golgin protein Coy1 functions in intra-Golgi retrograde transport and interacts with the COG complex and Golgi SNAREs. Mol Biol Cell :
Margulis, Neil G; Wilson, Joshua D; Bentivoglio, Christine M et al. (2016) Analysis of COPII Vesicles Indicates a Role for the Emp47-Ssp120 Complex in Transport of Cell Surface Glycoproteins. Traffic 17:191-210
Flanagan, John J; Mukherjee, Indrani; Barlowe, Charles (2015) Examination of Sec22 Homodimer Formation and Role in SNARE-dependent Membrane Fusion. J Biol Chem 290:10657-66
Shibuya, Aya; Margulis, Neil; Christiano, Romain et al. (2015) The Erv41-Erv46 complex serves as a retrograde receptor to retrieve escaped ER proteins. J Cell Biol 208:197-209
Brandizzi, Federica; Barlowe, Charles (2013) Organization of the ER-Golgi interface for membrane traffic control. Nat Rev Mol Cell Biol 14:382-92
Wilson, Joshua D; Thompson, Sarah L; Barlowe, Charles (2011) Yet1p-Yet3p interacts with Scs2p-Opi1p to regulate ER localization of the Opi1p repressor. Mol Biol Cell 22:1430-9
Lorente-Rodríguez, Andrés; Barlowe, Charles (2011) Requirement for Golgi-localized PI(4)P in fusion of COPII vesicles with Golgi compartments. Mol Biol Cell 22:216-29
Barlowe, Charles (2010) ER sheets get roughed up. Cell 143:665-6
Miller, Elizabeth A; Barlowe, Charles (2010) Regulation of coat assembly--sorting things out at the ER. Curr Opin Cell Biol 22:447-53
Wilson, Joshua D; Barlowe, Charles (2010) Yet1p and Yet3p, the yeast homologs of BAP29 and BAP31, interact with the endoplasmic reticulum translocation apparatus and are required for inositol prototrophy. J Biol Chem 285:18252-61

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