RGD Reference Report - Sept8 controls the binding of vesicle-associated membrane protein 2 to synaptophysin. - Rat Genome Database
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Sept8 controls the binding of vesicle-associated membrane protein 2 to synaptophysin.

Authors: Ito, Hidenori  Atsuzawa, Kimie  Morishita, Rika  Usuda, Nobuteru  Sudo, Kaori  Iwamoto, Ikuko  Mizutani, Kosuke  Katoh-Semba, Ritsuko  Nozawa, Yoshinori  Asano, Tomiko  Nagata, Koh-ichi 
Citation: Ito H, etal., J Neurochem. 2009 Feb;108(4):867-80. doi: 10.1111/j.1471-4159.2008.05849.x.
RGD ID: 13702278
Pubmed: (View Article at PubMed) PMID:19196426
DOI: Full-text: DOI:10.1111/j.1471-4159.2008.05849.x

Septins, a conserved family of GTP/GDP-binding proteins, are present in organisms as diverse as yeast and mammals. We analyzed the distribution of five septins, Sept6, Sept7, Sept8, Sept9 and Sept11, in various rat tissues by western blot analyses and found all septins to be expressed in brain. We also examined the developmental changes of expression of these septins in the rat brain and found that the level of Sept8 increased during post-natal development. Morphological analyses revealed that Sept8 is enriched at pre-synapses. Using yeast two-hybrid screening, we identified vesicle-associated membrane protein 2 (VAMP2), a soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE), as an interacting protein for Sept8. Synaptophysin is reported to associate with and recruit VAMP2 to synaptic vesicles and dissociate prior to forming the SNARE complex consisting of VAMP2, syntaxin and synaptosome-associated protein of 25 kDa. We showed that Sept8 suppresses the interaction between VAMP2 and synaptophysin through binding to VAMP2. In addition, we found that Sept8 forms a complex with syntaxin1A, and the Sept8-VAMP2 interaction is disrupted by synaptosome-associated protein of 25 kDa. These results suggest that Sept8 may participate in the process of the SNARE complex formation and subsequent neurotransmitter release.


Gene Ontology Annotations    

Biological Process

Cellular Component
presynapse  (IDA)

Molecular Function

Objects Annotated

Genes (Rattus norvegicus)
Septin8  (septin 8)
Snap25  (synaptosome associated protein 25)
Stx1a  (syntaxin 1A)
Syp  (synaptophysin)

Additional Information