title: Taurine effects on the transition temperature in Arrhenius plots of ATP-dependent calcium ion uptake in rat retinal membrane preparations.
abstract: The transition temperatures calculated from Arrhenius plots of ATP-dependent calcium ion uptake in rat retinal membrane preparations differed depending upon the presence or absence of exogenous taurine. At a constant calcium ion concentration of 10 microM and in the absence of taurine the transition temperature was 17.9 +/- 4.9 degrees, whereas in the presence of 20 mM taurine the transition temperature was raised to 25.4 +/- 0.8 degrees. Arrhenius plots of maximum velocities of calcium ion uptake (calculated from six calcium ion concentrations which varied from 5 to 300 microM) also demonstrated a taurine effect on the transition temperatures (13.5 degrees vs 25.5 degrees). In addition, taurine lowered the apparent activation energy for calcium ion uptake.
mesh_terms: D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D066298:In Vitro Techniques; D008565:Membrane Proteins / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D012044:Regression Analysis; D012160:Retina / Q000378:metabolism*; D013654:Taurine / Q000494:pharmacology*; D013696:Temperature
chemical_list: D008565:Membrane Proteins; D013654:Taurine; D000255:Adenosine Triphosphate; D002118:Calcium