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The chloride effect in chicken red cone receptors


Vision Research 20(6): 475-484
The chloride effect in chicken red cone receptors
The blue-shift of the .lambda.max of the chicken red-absorbing cone pigment (P569) in digitonin extracts at low Cl- concentrations was observed when the pigment was in situ in the outer segment membrane, in receptor outer segment suspensions and in individual receptors. The .lambda.max of the Cl--depleted pigment was about 506 nm, although some of the P569 form was always present and caused a variability in the .lambda.max of the bleaching difference spectrum. The P569 and the Cl--depleted forms of the pigments were interconverted by the simple addition or washing out of Cl-. P569 in the receptor membrane was relatively stable in the presence of hydroxylamine at normal Cl- concentrations, but reacted in the dark under ion-free conditions. With perfused excised retina the proportion of P569 of P569 in Cl- containing suspensions was typical of those in the retina, but breakage of the receptors under ion-free conditions prevented the blue-shift of P569 in the retina.

Accession: 006614336

PMID: 7434582

DOI: 10.1016/0042-6989(80)90122-4

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