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Published on: March 11, 2021
Human GlyRα2 pore dynamics in gating and inhibition
Emily Klemm1, Eric Gibbs2, Madeleine Stauffer3
1Department of Pharmacology, Case Western Reserve University, Cleveland, OH 44106-4970, USA; Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, OH 44106-4970, USA; Medical Scientist Training Program, Case Western Reserve University, Cleveland, OH 44106-4970, USA.
Structural insights into glycine receptors (GlyRs) reveal the intrinsic asymmetry of the GlyRα2 subtype. This finding provides a foundation for understanding GlyRα2
Area of Science:
- Neuroscience
- Structural Biology
- Molecular Pharmacology
Background:
- Glycine receptors (GlyRs) are crucial for inhibitory neurotransmission in the central nervous system.
- The GlyRα2 subtype plays a vital role in early neurodevelopment and is present in adults.
- Dysfunction of GlyRα2 is linked to neurodevelopmental disorders like autism and epilepsy.
Purpose of the Study:
- To elucidate the structural basis for the distinct functional and pharmacological properties of GlyRα2 compared to GlyRα1.
- To investigate the conformational states of human GlyRα2 using cryo-electron microscopy.
Main Methods:
- Cryo-electron microscopy (cryo-EM) was employed to determine the structures of full-length human GlyRα2.
- Reconstitution of GlyRα2 in peptidiscs allowed for the capture of multiple conformational states.
- Structural analysis included interactions with the pore-blocker picrotoxin.
Main Results:
- Novel cryo-EM structures revealed symmetric resting and desensitized states, along with an asymmetric open state of GlyRα2.
- The observed asymmetry in GlyRα2 is intrinsic and does not require β-subunit incorporation.
- Distinct GlyRα2 conformations were identified in the presence of picrotoxin, offering insights into allosteric modulation.
Conclusions:
- The study reveals the intrinsic structural asymmetry of GlyRα2, independent of subunit composition.
- These findings provide a structural foundation for understanding GlyRα2 function in neurodevelopment.
- The results offer new insights into GlyRα2-associated disorders and potential therapeutic targets.
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