β2E153 Residue at Loop B of GABAAR Is Involved in Agonist Stabilization and Gating Properties
Michał A. Michałowski, Aleksandra Brzóstowicz, Jerzy W. Mozrzymas · 2025
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Description
Michałowski and co-authors probe a single amino acid in the brain's main inhibitory receptor and show it helps hold the activating drug in place. The receptor, a GABA type A channel, opens when GABA binds and lets inhibition spread through the brain. The residue studied, called E153, sits on loop B of the beta-2 subunit, near the binding pocket.
Two mutants were tested with patch clamp recordings, one swapping in the opposite charge and one swapping in a water-shy residue. Both warped the channel's timing, speeding its closing in one case and disturbing both closing and desensitization in the other. Single-channel traces showed the second mutant opening less often and for shorter spells. The authors argue that E153 forms charge links with two nearby residues that brace loop C, keeping the bound shape stable.
Catalog record
| CREATOR | Michał A. Michałowski, Aleksandra Brzóstowicz, Jerzy W. Mozrzymas |
|---|---|
| YEAR | 2025 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 39 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |