Abstract
Photosystem II (PSII) is a multisubunit chlorophyll-binding enzyme that absorbs light to catalyze water oxidation and plastoquinone reduction. Chlorophyll excitonic interaction changes in PSII were studied by absorption and circular dichroism spectra from 25°C to 80°C, and protein subunit denaturation was monitored by differential scanning calorimetry. A four-stage process of chlorophyll excitonic interaction change was observed being correlated with the denaturation of protein subunits.
Keywords: photosystem II, thermal denaturation, chlorophyll excitonic interaction, circular dichroism, absorption spectrum, differential scanning calorimetry
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