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  Quantitative analysis of synaptic vesicle Rabs uncovers distinct yet overlapping roles for Rab3a and Rab27b in Ca2+-triggered exocytosis.

Pavlos, N. J., Groenborg, M., Riedel, D., Chua, J. J. E., Boyken, J., Kloepper, T. H., et al. (2010). Quantitative analysis of synaptic vesicle Rabs uncovers distinct yet overlapping roles for Rab3a and Rab27b in Ca2+-triggered exocytosis. Journal of Neuroscience, 30(40), 13441-13453. doi:10.1523/JNEUROSCI.0907-10.2010.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-D4F0-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1CAF-7
Genre: Journal Article

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 Creators:
Pavlos, N. J., Author
Groenborg, M., Author
Riedel, D.1, Author              
Chua, J. J. E.2, Author              
Boyken, J.3, Author              
Kloepper, T. H.3, Author              
Urlaub, H.4, Author              
Rizzoli, S. O.3, Author              
Jahn, R.3, Author              
Affiliations:
1Facility for Electron Microscopy, MPI for biophysical chemistry, Max Planck Society, ou_578615              
2Research Group of Protein Trafficking in Synaptic Development and Function, MPI for Biophysical Chemistry, Max Planck Society, ou_1933287              
3Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society, ou_578595              
4Research Group of Bioanalytical Mass Spectrometry, MPI for biophysical chemistry, Max Planck Society, ou_578613              

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 Abstract: Rab GTPases are molecular switches that orchestrate protein complexes before membrane fusion reactions. In synapses, Rab3 and Rab5 proteins have been implicated in the exo-endocytic cycling of synaptic vesicles (SVs), but an involvement of additional Rabs cannot be excluded. Here, combining high-resolution mass spectrometry and chemical labeling (iTRAQ) together with quantitative immunoblotting and fluorescence microscopy, we have determined the exocytotic (Rab3a, Rab3b, Rab3c, and Rab27b) and endocytic (Rab4b, Rab5a/b, Rab10, Rab11b, and Rab14) Rab machinery of SVs. Analysis of two closely related proteins, Rab3a and Rab27b, revealed colocalization in synaptic nerve terminals, where they reside on distinct but overlapping SV pools. Moreover, whereas Rab3a readily dissociates from SVs during Ca2+-triggered exocytosis, and is susceptible to membrane extraction by Rab-GDI, Rab27b persists on SV membranes upon stimulation and is resistant to GDI-coupled Rab retrieval. Finally, we demonstrate that selective modulation of the GTP/GDP switch mechanism of Rab27b impairs SV recycling, suggesting that Rab27b, probably in concert with Rab3s, is involved in SV exocytosis.

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Language(s): eng - English
 Dates: 2010-10-06
 Publication Status: Published in print
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 Rev. Method: Peer
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Title: Journal of Neuroscience
Source Genre: Journal
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Pages: - Volume / Issue: 30 (40) Sequence Number: - Start / End Page: 13441 - 13453 Identifier: -