Spectral distributions of "trap" pigments in the RC, CP47, and CP47-RC complexes of photosystem II at low temperature: a fluorescence line-narrowing and hole-burning study

Article Abstract:

Research was conducted to identify the "trap" pigments in the isolated reaction center (RC), the inner core antenna CP47 and the CP47-RC complex. and their association with low-frequency modes. Spectral hole-burning, broad-band absorption and fluorescence and fluorescence line-narrowing (FLN) experiments were performed on the Q(sub y)-band of three subcore RC complexes of photosystem II. Results reveal that the CP47-RC has two "traps" as indicated by the fact that the FLN spectra of the complex seem to be the sum of the individual spectra of the CP47 and RC.

Fluorescence, Organic pigments, Absorption, Spectral energy distribution

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Comparison of the excited-state dynamics of five- and six-chlorophyll photosystem II reaction center complexes

Article Abstract:

The redmost shoulder in the absorption spectrum on the Qy-band of isolated reaction center complexes of photosystem II (PS II RC) with five (RC-5) and six (RC-6) chlorophyll a molecules have been studied by conducting spectral hole-burning experiments. The effective homogeneous line width was measured at 682 nm and is a function of temperature at 1.2 and 4.2 K. Results indicate pigments of the redmost shoulder act as traps for the excitation energy.

Analysis, Chlorophyll, Excited state chemistry, Photosynthesis, Plant pigments

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Protein dynamics in photosystem II complexes of green plants studied by time-resolved hole-burning

Article Abstract:

A study was conducted to analyze the protein dynamics of the subcore reaction-center complexes of photosystem II. The photosystem II is characterized by a light-harvesting complex called LHC II and a central core that featured the reaction center. Results indicated that slow motions influence spectral diffusion at long delay times. In addition, findings showed a correlation between protein mass and the amount of spectral diffusion.

Plants, Plants (Organisms), Proteins

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