Related Experiment Video
Updated: Jul 5, 2026
08:06
Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
Published on: September 3, 2014
The presynaptic cytomatrix of brain synapses
T Dresbach1, B Qualmann, M M Kessels
1Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany.
Cellular and Molecular Life Sciences : CMLS
|March 7, 2001
Summary
The cytoskeletal matrix at the active zone (CAZ) organizes synaptic vesicle cycling. Key CAZ proteins like RIM and Bassoon are crucial for neurotransmitter release and recycling at neuronal synapses.
Area of Science:
- Neuroscience
- Cell Biology
Background:
- Synapses are critical for neuronal communication, utilizing neurotransmitters released from presynaptic terminals.
- Neurotransmitter release involves synaptic vesicles (SVs) docking, fusing, and recycling at the active zone (AZ).
- The cytoskeletal matrix at the active zone (CAZ) is hypothesized to organize this SV cycle.
Purpose of the Study:
- To review the structure and function of CAZ-specific proteins.
- To elucidate the organization of exocytotic and endocytic machineries by the presynaptic cytoskeleton.
- To summarize recent advances in understanding active zone assembly during development.
Main Methods:
- Literature review of existing research on CAZ proteins.
- Analysis of studies on cytoskeleton-synaptic vesicle interactions.
- Synthesis of findings on active zone biogenesis.
Main Results:
- Identified several multi-domain cytoskeleton-associated proteins (e.g., RIM, Bassoon, Piccolo/Aczonin, Munc-13) localized at the AZ as CAZ components.
- Detailed the roles of these proteins in organizing SV exocytosis and endocytosis.
- Highlighted the essential role of the presynaptic cytoskeleton in regulating neurotransmitter release.
Conclusions:
- CAZ proteins are integral to the structural and functional organization of the active zone.
- The presynaptic cytoskeleton plays a pivotal role in coordinating SV trafficking and neurotransmitter release.
- Understanding CAZ assembly is key to comprehending synapse formation and function.
Related Concept Videos
01:12Synaptic Signaling
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
02:47The Synapse
Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
01:09Synaptic Signaling
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:25Overview of Synapses
A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...