Fig. 1: The photocycle in Deinococcus radiodurans bacteriophytochrome.
From: Protein control of photochemistry and transient intermediates in phytochromes
Representation of the PSM of the two photoproducts: Pr (PDB ID:4Q0J https://www.rcsb.org/structure/4Q0J27) and Pfr (PDB ID:5C5K https://www.rcsb.org/structure/5C5K28), with a zoom on the bilin chromophore (green), highlighting the PAS (blue), GAF (orange) and PHY (red) domains. The D-ring counterclockwise rotation (ccw) of the chromophore is represented by the red arrow in the left inset46. Structures of the chromophore and the nearby residues obtained in this work for the early and late Lumi-R intermediates are reported in the two upper corners. The timescales for the different steps are the ones reported in the literature36.
