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To gain a better understanding of the light-induced reduction of protochlorophyllide (PChlide) to chlorophyllide as a key regulatory step in chlorophyll synthesis, we performed transient infrared absorption measurements on PChlide in d4-methanol. Excitation in the Q-band at 630 nm initiates dynamics characterized by three time constants: τ1 = 3.6 ± 0.2, τ2 = 38 ± 2, and τ3 = 215 ± 8 ps. As indicated...
Phytochromes are light-sensing pigments found in plants and bacteria. For the first time, the Pfr photoreaction of a phytochrome has been subject to ultrafast infrared vibrational spectroscopy. Three time constants of 0.3ps, 1.3ps, and 4.0ps were derived from the kinetics of structurally specific marker bands of the biliverdin chromophore of Agp1-BV from Agrobacterium tumefaciens after excitation...