Magnetophotoselection study of the lowest excited triplet state of the primary donor in photosynthetic bacteria

Article Abstract:

A new study uses direct detection EPR spectroscopy to produce the first time-resolved magnetophotoselection study of the primary donor triplet states in Rhodobacter sphaeroides R26 and Rhodpseudomonas virdis bacterial reaction centers.

Chemistry, Physical and theoretical, Physical chemistry, Electrophysiology

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Electrochemical oxidation of bacteriochlorophyll a in reaction centers and antenna complexes of photosynthetic bacteria

Article Abstract:

The oxidation of BChl in several pigment-protein complexes involved in bacterial photosynthesis is investigated by optical spectroelectrochemistry, with the aim to obtain information on the tuning of the BChl oxidative midpoint potential [E(sub m)] through BChl-BChl and BChl-protein interactions. A difference is observed in reversibility at the early oxidation stage, which is attributed to the simultaneous presence of oxidized caretenoid and BChl in LH2 but not in LH1.

Science & research, Electrochemical analysis

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"Glass transition" near 200 K in the bacterial photosynthetic reaction center protein detected by studying the distances in the transient P(super +)Q(sub A)(super -) radical pair

Article Abstract:

The transient radical pair P(super +)Q(sub A)(super -) in the photosynthetic reaction center from Rhodobacter sphaeroides R26 was examined over a wide temperature range using out-of-phase electron spin-echo envelope modulation (ESEEM) spectroscopy. The findings reveal that the radical pair undergoes a noticeable molecular motion around 200 K that may be characterized by a change in the distance in the pair by ~0.3 nm.

Analysis, Neutrons, X-ray crystallography, Bacterial proteins, Properties, Neutron scattering, Structure

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