Charge Separation in the Photosystem II Reaction Center Resolved by Multispectral Two-Dimensional Electronic Spectroscopy

TL;DR

This study uses advanced multispectral 2D spectroscopy techniques at 77K to resolve the complex charge separation mechanism in Photosystem II reaction centers, revealing a primary electron acceptor and donor pathway involving delocalized states.

Contribution

It introduces a combined multispectral 2D electronic and vibrational spectroscopy approach to elucidate the charge separation mechanism in PSII-RC at high resolution.

Findings

Charge separation occurs on multiple timescales.

PheoD1 is identified as the primary electron acceptor.

ChlD1 and PD1 act as the primary electron donors.

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 timescales of energy transfer and charge separation, and the severely overlapping pigment transitions in the Qy 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 77K. This multispectral combination correlates the overlapping Qy excitons with distinct anion and pigment-specific Qx and mid-IR transitions to resolve the charge separation mechanism and excitonic structure. Through extensive simultaneous analysis of the multispectral 2D data we find that charge separation proceeds on multiple timescales from a highly delocalized excited state via a single pathway in which PheoD1 is the primary electron acceptor, while ChlD1 and PD1 act in concert as the primary electron donor.