Our goal is to understand the mechanisms governing the formation, targeting, and fusion of transport vesicles. We have reconstituted these processes in cell-free extracts containing Golgi membrane fractions, and have accumulated evidence supporting the working hypothesis that protein transport between membrane compartments in this cell-free system is due to the budding of transport vesicles from one cisterna of a Golgi stack followed by fusion of the vesicle with the next cisterna. We now hope to purify two key cytoplasmic components (C and B) that have been identified as necessary for vesicle budding and fusion respectively. Furthermore, we hope to purify a recently discovered NEM-sensitive factor (NSF) that is bound to the membranes in an ATP-dependent fashion. NSF seems to be needed for membrane fusion, and the activity of NSF is greatly stimulated by long chain acyl Coenzyme A, acting as a cofactor. We hope to purify both NSF and its presumed """"""""receptor"""""""" that binds it to Golgi membranes, as well as to elucidate the basis of the Coenzyme A requirement, which may be for an acylation-decylation cycle in which NSF participates that regulates a step leading to fusion of transport vesicles. The role of transport vesicles as intermediates will be studied by electron microscope immunocytochemistry, an important technique which will also be exploited to determine the nature of transport intermediates which accumulate when individual transport components (like NSF) are eliminated, offering clues as to the functional role of the eliminated component.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK027044-11
Application #
3228149
Study Section
Cellular Biology and Physiology Subcommittee 1 (CBY)
Project Start
1988-05-01
Project End
1992-03-31
Budget Start
1989-04-01
Budget End
1990-03-31
Support Year
11
Fiscal Year
1989
Total Cost
Indirect Cost
Name
Princeton University
Department
Type
Schools of Arts and Sciences
DUNS #
002484665
City
Princeton
State
NJ
Country
United States
Zip Code
08544
Rebane, Aleksander A; Wang, Bigeng; Ma, Lu et al. (2018) Two Disease-Causing SNAP-25B Mutations Selectively Impair SNARE C-terminal Assembly. J Mol Biol 430:479-490
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Wang, Jing; Li, Feng; Bello, Oscar D et al. (2017) Circular oligomerization is an intrinsic property of synaptotagmin. Elife 6:
Li, Feng; Tiwari, Neeraj; Rothman, James E et al. (2016) Kinetic barriers to SNAREpin assembly in the regulation of membrane docking/priming and fusion. Proc Natl Acad Sci U S A 113:10536-41
Wang, Yong Jian; Li, Feng; Rodriguez, Nicolas et al. (2016) Snapshot of sequential SNARE assembling states between membranes shows that N-terminal transient assembly initializes fusion. Proc Natl Acad Sci U S A 113:3533-8
Xu, Weiming; Nathwani, Bhavik; Lin, Chenxiang et al. (2016) A Programmable DNA Origami Platform to Organize SNAREs for Membrane Fusion. J Am Chem Soc 138:4439-47
Bello, Oscar D; Auclair, Sarah M; Rothman, James E et al. (2016) Using ApoE Nanolipoprotein Particles To Analyze SNARE-Induced Fusion Pores. Langmuir 32:3015-23
Wu, Zhenyong; Auclair, Sarah M; Bello, Oscar et al. (2016) Nanodisc-cell fusion: control of fusion pore nucleation and lifetimes by SNARE protein transmembrane domains. Sci Rep 6:27287

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