Toward level-to level energy transfers in photosynthesis: the Fenna-Matthews-Olson protein

Article Abstract:

Research was conducted to examine the Fenna-Matthews-Olson protein which is a trimeric bacteriochlorophyll (BChl) a-protein that promotes electronic energy transfers from the light-harvesting antenna to reaction centers in green sulfur bacteria. Its X-ray structure is known at the atomic level for two green sulfur bacterial species, namely, Prosthecochloris aestuarii and Chlorobium tepidum. The lack of an ab initio theory for the effects of known protein environments on BChl a transition energies limits insights into the workings of antennas with multiple nonequivalent pigment sites.

Analysis, Proteins, Photosynthesis research, Protein structure

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Selective Raman scattering from the core chlorophylls in photosystem I via preresonant near-infrared excitation

Article Abstract:

Near infrared excitation is used to study the Raman scattering characteristics of photosystem I (PSI). Results show that the Raman spectra are characteristic of neutral, pentacoordinate chlorophyll a molecules. The oxidation state of the primary electron donor P700 had no effect on the Raman spectra. The temperature dependence of the preresonance Raman scattering intensities of the neutral chlorophylls in PSI is also determined by the redox state of P700.

Raman effect

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A theoretical study of the excited states of chlorophyll a and pheophytin a

Article Abstract:

The excited states of pheophytin a and cholorophyll a were calculated using density functional theory and the multireference configuration interaction method.

Usage, Excited state chemistry

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