Journal: Anesthesiology
Article Title: Alphaxalone Binds in Inner Transmembrane β + –α − Interfaces of α1β3γ2 γ-Aminobutyric Acid Type A Receptors
doi: 10.1097/ALN.0000000000001978
Figure Lengend Snippet: The transmembrane domain of a α1β3γ2L structural homology model based on GluCl (pdb 4COF) is depicted 25. Subunit peptide backbones are shown as ribbons (α1 = yellow; β3 = blue; γ2L = green), with sidechains of interest (see Table 1) shown in space-filling mode and labeled. Amino acid sidechains on β3-M3 and α1-M1 that are directly photolabeled by analogs of one or more study anesthetics are colored orange-red. Anesthetic contact sidechains that have previously been identified using substituted cysteine modification-protection are colored purple. Other β3-M2 and β3-M3 sidechains that line the β+–α– cleft and three sidechains predicted to face the β3 intra-subunit helix bundle pocket (Y284, G287, and E298), are colored gray. The location of α1Q242 (pink) is also shown. Inserts display the molecular space-filling structures of propofol, etomidate, and alphaxalone, approximately scaled to the receptor model. Hydrogens have been hidden for clarity.
Article Snippet: Complementary DNAs encoding human α1, β3, and γ2L GABA A receptor subunits in pCDNA3.1 expression vectors (Thermo Fisher Scientific, Waltham, MA, USA) were used.
Techniques: Labeling, Modification