Photophysical behavior and assignment of the low-energy chlorophyll states in the CP43 proximal antenna protein of higher plant Photosystem II
We have employed absorption, circular dichroism (CD), and persistent spectral hole-burning measurements at 1.7 K to study the photoconversion properties and exciton coupling of low-energy chlorophylls (Chls) in the CP43 proximal antenna light-harvesting subunit of photosystem II (PSII) isolated from spinach. These ∼683 nm states act as traps for excitation energy in isolated CP43. They "bleach" at 683 nm upon illumination and photoconvert to a form absorbing in the range ∼660-680 nm. We present...[Show more]
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