Vesicle Fusion Modes
Vesicle Fusion Modes - Related Videos
01:26
Fusion of Secretory Vesicles with the Plasma Membrane
0 Views •
2023
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...
12:30
Confocal Microscopy to Measure Three Modes of Fusion Pore Dynamics in Adrenal Chromaffin Cells
0 Views •
Cited by 1 •
2022
This protocol describes a confocal imaging technique to detect three fusion modes in bovine adrenal chromaffin cells. These fusion modes include 1) close-fusion (also called kiss-and-run), involving fusion pore opening and closure, 2) stay-fusion, involving fusion pore opening and maintaining the opened pore, and 3) shrink-fusion, involving fused vesicle shrinkage.
02:45
Nuclear Fusion
0 Views •
2020
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons. A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
01:07
What is a Mode?
0 Views •
2023
The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set. There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times. A data set with two modes is called bimodal. For example,...
09:19
Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
0 Views •
2012
We have developed a cell fusion assay that quantifies SNARE-mediated membrane fusion events by activated expression of β-galactosidase.
FAQs
The fusion mode selected at a presynaptic terminal links membrane behavior to signaling output. Full-collapse fusion exposes the vesicle membrane to the plasma membrane, while transient-pore behavior limits how long the connection remains open. Those alternatives can alter release duration and the amount of neurotransmitter delivered, making fusion mode a control point for rapid communication rather than merely a retrieval detail.
Calcium-triggered fusion provides the activity-dependent trigger, while SNARE proteins contribute to the membrane-merging machinery. Their regulation can therefore influence which release behavior occurs after neuronal activity. Examining these two components together helps connect an incoming calcium signal to pore behavior, transmitter output, and subsequent vesicle handling, providing a molecular framework for understanding changes in synaptic signaling.
The distinction concerns what happens after the transient pore closes. In kiss-and-run, the vesicle detaches, whereas kiss-and-stay retains the vesicle after closure. That difference matters because detachment and retrieval are not equivalent outcomes: they can alter how vesicles are recycled and how readily the terminal supports later signaling, especially when activity patterns change.
Different patterns of neuronal activity can place different demands on release and vesicle availability. Because fusion modes differ in pore behavior, transmitter output, and membrane retrieval, the same presynaptic terminal may not experience identical functional consequences under every activity pattern. Studying these relationships helps explain how synapses adjust communication and maintain signaling during changing neural conditions.
A useful comparison should track more than whether fusion occurs. Researchers can examine release duration, neurotransmitter output, vesicle recycling, and effects on synaptic plasticity, then relate those outcomes to calcium-triggered fusion and SNARE protein activity. This integrated view distinguishes immediate signaling effects from longer-lasting consequences for synaptic function and clarifies how molecular regulation shapes transmission.
Altered regulation of calcium-triggered fusion or SNARE activity could change how synaptic vesicles release transmitter, are recycled, or influence plasticity. For this reason, comparing fusion behavior provides a way to connect molecular events at the presynaptic membrane with disrupted neuronal communication. The topic is relevant to neurological dysfunction research because it links release mechanisms to functional changes in synapses.