Two ground state isoforms and a chromophore D-ring photoflip triggering extensive intramolecular changes in a canonical phytochrome.

Abstract

Phytochrome photoreceptors mediate light responses in plants and in many microorganisms. Here we report studies using (1)H-(13)C magic-angle spinning NMR spectroscopy of the sensor module of cyanobacterial phytochrome Cph1. Two isoforms of the red-light absorbing Pr ground state are identified. Conclusive evidence that photoisomerization occurs at the C15… (More)
DOI: 10.1073/pnas.1013377108

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