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Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
Published on: September 17, 2011
Protein composition of immunoprecipitated synaptic ribbons.
A Kantardzhieva1, M Peppi, W S Lane
1Eaton-Peabody Laboratory, Department of Otology and Laryngology, Massachusetts Eye and Ear Infirmary and Harvard Medical School, 243 Charles Street, Boston, Massachusetts 02114, United States.
Journal of Proteome Research
|November 23, 2011
Summary
Researchers quantified the protein composition of the synaptic ribbon complex in sensory cells. This analysis revealed 30 associated proteins, crucial for vesicle handling and neurotransmitter release.
Area of Science:
- Neuroscience
- Cell Biology
- Proteomics
Background:
- The synaptic ribbon is a specialized structure in sensory hair cells and photoreceptors.
- It plays a critical role in neurotransmitter vesicle release, essential for signal transduction.
Purpose of the Study:
- To objectively and quantitatively analyze the protein composition of the synaptic ribbon complex.
- To identify proteins associated with the ribbon and understand their functional roles.
Main Methods:
- Mass spectrometry-based proteomics was employed for comprehensive protein identification.
- Affinity purification of synaptic ribbons and control immunoprecipitations were used to ensure specificity.
- Analysis was performed on mouse tissue for a complete proteomic profile.
Main Results:
- Thirty proteins, including 56 isoforms and subunits, were identified as associated with the synaptic ribbon complex.
- Proteins were categorized into functional groups: vesicle handling (38.5%), scaffold (7.3%), cytoskeletal molecules (20.6%), phosphorylation enzymes (10.6%), molecular chaperones (8.2%), and transmembrane proteins (11.3%).
- The three CtBP isoforms were identified as the most abundant proteins within the ribbon complex.
Conclusions:
- The synaptic ribbon complex is composed of proteins involved in vesicle dynamics and exocytosis.
- A significant presence of phosphorylation enzymes suggests a highly regulated and active structure.
- The findings provide a comprehensive understanding of the molecular architecture and function of the synaptic ribbon.
