Identification of Strychnine Binding Sites in the Rat Retina

Abstract
[3H]Strychnine specifically binds to membrane fractions isolated from rat retinae. The binding is saturable, with an apparent dissociation constant, KD, of 14.3 × 10−9 M and 205 fmol bound/mg protein. Specific binding is time‐dependent and proportional to protein concentration. Glycine and taurine are equally potent inhibitors of [3H]strychnine binding (Ki= 4 × 10−5 M); no other amino acids endogenously present in the retina inhibited [3H]strychnine binding.