Anion dependent transition of two acidic forms of bacteriorhodopsinстатья
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Аннотация:The effects of H+ and Cl− concentrations upon bacteriorhodopsin have been studied. In a suspension of bacteriorhodopsin sheets it is shown that the transition of the blue (BR605) to the purple (BR565) acidic form is caused by an increase in the concentration of Cl− rather than of H+ The transition as a function of pCl is linear in Hill plots, with a slope close to 3. The Hill coefficient for the pCl dependence of bacteriorhodopsin, solubilized in laurylsucrose, lies between 2 and 3. The data are consistent with the assumption that the cooperativity of the interconversion of two acidic forms of bacteriorhodopsin is due to the reversible binding of three chloride anions by a bacteriorhodopsin molecule.