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Gβγ SNARE Interactions and Their Behavioral Effects
Simon Alford1, Heidi Hamm2, Shelagh Rodriguez3
1Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL, 60612-7308, USA. sta@uic.edu.
Neurochemical Research
|May 13, 2018
Summary
Presynaptic G Protein Coupled Receptors (GPCRs) modulate neurotransmitter release through Gβγ subunits. These subunits interact with SNARE complexes and calcium sensors, influencing synaptic transmission and behavior.
Area of Science:
- Neuroscience
- Molecular Biology
- Synaptic Plasticity
Background:
- Presynaptic terminals utilize complex molecular machinery to regulate neurotransmitter exocytosis.
- G Protein Coupled Receptors (GPCRs) are ubiquitously expressed at synapses, playing a critical role in synaptic function.
- GPCRs modulate presynaptic release probability through various mechanisms, including Gα effectors and Gβγ subunit actions.
Purpose of the Study:
- To elucidate the mechanisms by which presynaptic GPCRs, particularly Gβγ subunits, modulate neurotransmitter release.
- To investigate the interaction of Gβγ subunits with SNARE complexes and calcium sensors like synaptotagmin I.
- To understand how these presynaptic modulations contribute to specific behavioral outcomes, exemplified by 5-HT receptor actions in the spinal cord.
Main Methods:
- Investigating the role of Gβγ subunits in altering presynaptic ionic conductances and calcium (Ca2+) entry.
- Analyzing the direct interaction of Gβγ with SNARE complexes and its modulation by calcium sensors.
- Examining the synergistic effects of presynaptic and postsynaptic Gβγ and 5-HT receptor activity on neuronal function and behavior.
Main Results:
- Gβγ subunits can alter presynaptic Ca2+ entry and directly interact with SNARE complexes to reduce neurotransmitter release.
- Calcium-sensitive displacement of Gβγ from SNARE complexes by synaptotagmin I restores exocytosis.
- Synergistic action of presynaptic Gβγ and postsynaptic 5-HT receptor-mediated calcium-dependent potassium channel activation influences locomotion.
Conclusions:
- Presynaptic GPCRs, via Gβγ subunits, offer a sophisticated mechanism for fine-tuning synaptic transmission.
- The interplay between Gβγ, SNAREs, and calcium sensors provides Ca2+-dependent regulation of exocytosis.
- Convergent presynaptic and postsynaptic signaling pathways, as seen with 5-HT receptors, are crucial for regulating central nervous system functions like locomotion.
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