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Evidence that a light accelerated abrupt change in membrane characteristics of bovine rod outer segment fragments takes place at acidic ph

, : Evidence that a light accelerated abrupt change in membrane characteristics of bovine rod outer segment fragments takes place at acidic ph. Biochemical & Biophysical Research Communications 95(3): 1119-1125

Changes in the turbidity of suspensions of bovine rod outer segment fragments induced by rhodopsin bleaching were measured in various concentrations of divalent cations at acidic pH (4.7-5.4). The turbidity of the suspensions increased drastically by bleaching at acidic pH, unlike at neutral pH. The extent of turbidity change became maximum at a particular concentration of divalent cations (i.e., 5mM CaCl2, 5 mM MgCl2 or 5 mM mixed divalent cations). The turbidity increment in the presence of 5 mM MgCl2 was greatly enhanced by the addition of a minute amount of CaCl2. The membrane characteristic apparently is abruptly changed by bleaching at acidic pH. Two kinds of binding sites for Ca ions apparently exist: a Ca2+ specific site and a nonspecific site to which Mg2+ can bind.

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