Charge separation in the photosystem II reaction center resolved by multispectral two-dimensional electronic spectroscopy.

ABSTRACT: The photosystem II reaction center (PSII RC) performs the primary energy conversion steps of oxygenic photosynthesis. While the PSII RC has been studied extensively, the similar time scales of energy transfer and charge separation and the severely overlapping pigment transitions in the Q_y region have led to multiple models of its charge separation mechanism and excitonic structure. Here, we combine two-dimensional electronic spectroscopy (2DES) with a continuum probe and two-dimensional electronic vibrational spectroscopy (2DEV) to study the cyt b559-D1D2 PSII RC at 77 K. This multispectral combination correlates the overlapping Q_y excitons with distinct anion and pigment-specific Q_x and mid-infrared transitions to resolve the charge separation mechanism an

SUBMITTER: Nguyen HH 

PROVIDER: S-EPMC10156117 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature