ArticleBiochemistry2026
Proton-Coupled Chromophore and Protein Structural Changes Control Phytochrome Activation.
Article in Biochemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Phytochromes are sensory photoreceptors in eukaryotes and prokaryotes that control physiological processes. In prototypical phytochromes, photoisomerization of the methine-bridged tetrapyrrole of the Pr state is the first step in (de)activating the photoreceptor. The underlying reaction sequence runs through a series of intermediate states. Among them, the Meta-Rc state plays a critical role since it precedes the formation of the Pfr state, which is linked to the functional secondary structure transition of the tongue, a phytochrome-specific peptide segment. In this work, we have studied the structure and reactions of Meta-Rc of the bacterial phytochrome Agp1 (
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