Related Experiment Video
Updated: May 28, 2025
07:22
Live Imaging of Synaptic Vesicle Recycling in the Neuromuscular Junction of Dissected Larval Zebrafish
Published on: February 7, 2025
331
Molecular Components of Vesicle Cycling at the Rod Photoreceptor Ribbon Synapse
Christin Hanke-Gogokhia1, Thomas E Zapadka2, Stella Finkelstein3
1Department of Ophthalmology & Visual Science, Yale University School of Medicine, New Haven, CT, USA.
Advances in Experimental Medicine and Biology
|February 10, 2025
Summary
Rod photoreceptors, essential for dim light vision, rely on precise synaptic vesicle recycling. This review details proteins crucial for maintaining high glutamate release rates at the rod ribbon synapse.
Area of Science:
- Neuroscience
- Retinal Biology
- Synaptic Transmission
Background:
- Rod photoreceptors are specialized neurons enabling vision in low light conditions.
- They possess a unique ribbon synapse for rapid glutamate release onto bipolar and horizontal cells.
- Efficient synaptic vesicle recycling is critical for sustained neurotransmission.
Purpose of the Study:
- To review the properties of synaptic transmission in mouse rod photoreceptors.
- To highlight key proteins involved in synaptic vesicle recycling at the rod ribbon synapse.
Main Methods:
- Literature review of studies on rod photoreceptor synaptic transmission.
- Analysis of protein functions in synaptic vesicle exocytosis and endocytosis.
Main Results:
- Mouse rods exhibit a high glutamate release rate (~20 vesicles/synapse/second) from a single release site.
- A delicate balance between vesicle exocytosis and endocytosis is required to sustain this rate.
- Specific proteins play essential roles in the complex process of synaptic vesicle recycling.
Conclusions:
- Synaptic vesicle recycling is a tightly regulated process vital for rod photoreceptor function.
- Understanding these mechanisms provides insights into retinal signaling and potential therapeutic targets.
Related Concept Videos
01:45Vesicular Tubular Clusters
2.4K
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
2.4K
01:26Fusion of Secretory Vesicles with the Plasma Membrane
10.8K
Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
10.8K
01:12Clathrin Coated Vesicles
6.7K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
6.7K
01:25Rab Cascades
2.6K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
2.6K
01:32Pinching-off of Coated Vesicles
3.1K
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
3.1K
01:22Photoreceptors and Visual Pathways
5.6K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
5.6K