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“Mechanistic analyses suggest that substitution with serine , the β1 residue at this position, primarily reduces etomidate efficacy, while mutation to methionine eliminates etomidate sensitivity and might prevent drug binding.”
“The mutation of an amino acid (Asn-289) present within the channel domain of the beta3 subunit to Ser (the homologous residue in beta1), strongly suppressed the GABA-modulatory and GABA-mimetic effects of etomidate.”