Perturbed interaction between residues 85 and 204 in Tyr-185-->Phe and Asp-85-->Glu bacteriorhodopsins.

Abstract

According to earlier reports, residue 85 in the bacteriorhodopsin mutants D85E and Y185F deprotonates with two apparent pKa values. Additionally, in Y185F, Asp-85 becomes significantly more protonated during light adaptation. We provide a new explanation for these findings. It is based on the scheme that links the protonation state of residue 85 to the… (More)

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