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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.
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Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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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.
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An unexpected specialization of the active zone scaffold RIM at high release synapses.

Rebecca Stark1,2, Prapti Patel1, Wanying Dong1

  • 1University of Southern California, Department of Neurobiology, Los Angeles, CA USA.

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|April 3, 2026
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Summary

The active zone protein RIM is not essential for all neurotransmission but acts as a specialized gain factor for high-release synapses. It is crucial for phasic synapse function and plasticity, but dispensable for tonic synapses.

Keywords:
DrosophilaRIMhomeostatic plasticityneuromuscular junctionsynapse

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • The active zone protein RIM is traditionally considered essential for neurotransmitter release.
  • Its necessity across different synapse types with varying release probabilities remains unclear.

Purpose of the Study:

  • To investigate the role of RIM in distinct synapse subtypes.
  • To determine if RIM is a universal component or a specialized factor for specific synaptic functions.

Main Methods:

  • Utilized botulinum neurotoxin-based silencing to isolate synaptic inputs in Drosophila.
  • Employed super-resolution imaging to analyze RIM localization relative to CaV2 channels.
  • Investigated synaptic transmission and plasticity at phasic and tonic synapses.

Main Results:

  • RIM is essential for high-fidelity transmission at phasic synapses but dispensable at tonic synapses.
  • RIM is required for acute presynaptic homeostatic potentiation (PHP) at phasic inputs, not tonic inputs.
  • Super-resolution imaging shows RIM is localized closer to CaV2 channels at phasic synapses, coordinating plasticity.

Conclusions:

  • RIM functions as a specialized gain factor, not a universal requirement, for synaptic transmission.
  • RIM's role is dynamic, shaping the performance and plasticity of high-demand synapses.
  • This revises the canonical view of active zone architecture and RIM's function.