Extended Data Fig. 13: Decay associated spectra (DAS) and PBS arrays.
From: Structures of a phycobilisome in light-harvesting and photoprotected states
DAS spectra obtained either a, from simulation or b, from fitting the data obtained from time-resolved fluorescence (right, adapted with permission from ref. 7) monitoring the excitation energy flow in the PBS. In simulations, PBS was excited into the far end of the rod. The ~100 ps component (green) in the experimental data was interpreted as due to excitation annihilation83, hence it is not present in the simulation. c, Absorption (black) and emission (red) spectra of bilins used to model the excitation energy transfer in PBS. d, PBS arrays were modeled based on cryo-electron tomography data from ref. 25. Only the up-up conformation is compatible with PBS arrays. e, The up-down conformation would result in array termination. f, A PBS switching to the down-down conformation could result in array dispersion.
