Related Experiment Video
Updated: Jun 20, 2026
08:04
Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
Published on: June 6, 2025
Modeling neuronal nicotinic and GABA receptors: important interface salt-links and protein dynamics
Richard J Law1, Felice C Lightstone
1Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA.
Biophysical Journal
|September 16, 2009
Summary
Protein dynamics in Cys-loop receptors are key to their function. This study models nicotinic acetylcholine (nACh) and GABA receptors, revealing a network of salt-links crucial for cooperative gating motions.
Area of Science:
- Molecular biology
- Neuroscience
- Structural biology
Background:
- Protein motions governing the gating mechanism in Cys-loop ligand-gated ion receptors remain poorly understood.
- The translation of ligand-binding domain motions to the transmembrane domain and the linkage of subunit rotations in cooperative gating are active areas of investigation.
Purpose of the Study:
- To investigate the role of protein motions and salt-link networks in the gating mechanisms of Cys-loop ligand-gated ion receptors.
- To construct homology models of alpha4beta2 nicotinic acetylcholine (nACh) and beta2alpha1gamma2 GABA receptors for structure-function studies.
Main Methods:
- Construction of homology models for nACh and GABA receptors based on a torpedo nicotinic receptor structure.
- Analysis of salt-link formation and dynamics within the binding and transmembrane domains during simulated receptor function.
Main Results:
- A reliable homology model preserving a key salt-link was developed, suitable for structure-function studies.
- Transient salt-links, including the E45-R209 link, were observed at the binding-transmembrane domain interface.
- Conserved intersubunit salt-links at the M2 helix and M1-linker/beta-sheet interfaces were identified in both nAChR and GABAR structures.
Conclusions:
- A network of salt-links is hypothesized to be vital for transmitting cooperative gating motions between subunits, influenced by ligand binding.
- These salt-links likely regulate conformational changes, setting specific states for receptor gating.
- Experimental validation of these salt-link network hypotheses is proposed for future research.
More Related Videos
Related Concept Videos
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
01:19Ligand-gated Ion Channels
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
01:19Ligand-gated Ion Channels
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
01:15Cholinergic Receptors: Nicotinic
Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
01:15G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
01:21G-protein Coupled Receptors
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.