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- W2032086676 endingPage "6192" @default.
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- W2032086676 abstract "In vertebrate visual pigments, a glutamic acid serves as a negative counterion to the positively charged chromophore, a protonated Schiff base of retinal. When photoisomerization leads to the Schiff base deprotonating, the anionic glutamic acid becomes protonated, forming a neutral species that activates the visual cascade. We show that in octopus rhodopsin, the glutamic acid has no anionic counterpart. Thus, the “counterion” is already neutral, so no protonated form of an initially anionic group needs to be created to activate. This helps to explain another observation—that the active photoproduct of octopus rhodopsin can be formed without its Schiff base deprotonating. In this sense, the mechanism of light activation of octopus rhodopsin is simpler than for vertebrates, because it eliminates one of the steps required for vertebrate rhodopsins to achieve their activating state." @default.
- W2032086676 created "2016-06-24" @default.
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- W2032086676 date "1999-05-25" @default.
- W2032086676 modified "2023-10-18" @default.
- W2032086676 title "How vertebrate and invertebrate visual pigments differ in their mechanism of photoactivation" @default.
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- W2032086676 doi "https://doi.org/10.1073/pnas.96.11.6189" @default.
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