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• W2326537267 abstract "In photosystem II (PSII), water is oxidized at the oxygen-evolving complex. This process occurs through a light-induced cycle that produces oxygen and protons. While coupled proton and electron transfer reactions play an important role in PSII and other proteins, direct detection of internal proton transfer reactions is challenging. Here, we demonstrate that the unnatural amino acid, 7-azatryptophan (7AW), has unique, pH-sensitive vibrational frequencies, which are sensitive markers of proton transfer. The intrinsically disordered, PSII subunit, PsbO, which contains a single W residue (Trp241), was engineered to contain 7AW at position 241. Fluorescence shows that 7AW-241 is buried in a hydrophobic environment. Reconstitution of 7AW(241)PsbO to PSII had no significant impact on oxygen evolution activity or flash-dependent protein dynamics. We conclude that directed substitution of 7AW into other structural domains is likely to provide a nonperturbative spectroscopic probe, which can be used to define internal proton pathways in PsbO." @default.
• W2326537267 created "2016-06-24" @default.
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• W2326537267 date "2014-01-17" @default.
• W2326537267 modified "2023-10-16" @default.
• W2326537267 title "First Site-Specific Incorporation of a Noncanonical Amino Acid into the Photosynthetic Oxygen-Evolving Complex" @default.
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• W2326537267 doi "https://doi.org/10.1021/cb400880u" @default.
• W2326537267 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24437616" @default.
• W2326537267 hasPublicationYear "2014" @default.
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