B-side electron transfer in a Rhodobacter sphaeroides reaction center mutant in which the B-side monomer bacteriochlorophyll is replaced with bacteriopheophytin

Article Abstract:

A mutation in the Rhodobacter sphaeroides reaction center (RC) culminates in the replacement of the monomer bacteriochlorophyll located on the inactive B-side of the RC by a bacteriopheophytin. An analysis of the time-resolved spectra indicates the formation of two states during the initial reaction in the mutant, the usual state observes in the wild-type RC and a new state formed during cofactor formation. No further electron transfer is observed.

Mutation (Biology), Mutation, Oxidation-reduction reaction, Oxidation-reduction reactions

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Mechanism of carotenoid singlet excited state energy transfer in modified bacterial reaction centers

Article Abstract:

Ultrafast transient laser spectroscopy is used to investigate carotenoid singlet excited state energy transfer in various Rhodobacter (Rb) sphaeroides reaction centers (RCs) modified either genetically or chemically. Anaerobically grown wild type RCs contain spheroidene, which has 10 conjugated double bonds (N = 10).

Carotenoids, Excited state chemistry, Bacteriology, Chemical properties, Atomic properties, Energy transformation

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Manipulations of the B-side charge-separated states' energetics in the rhodobacter sphaeroides reaction center

Article Abstract:

Mutation HL (M182) in bacterial photosynthetic reaction center (RC) confirm estimates for energetics of B-side charge separated states. These measurements have allowed a more accurate assignment of B-side charge-separated states' energetics than was previously possible.

All Other Basic Organic Chemical Manufacturing, Vinyl Chloride Monomer, Electron transport, Chemistry, Physical and theoretical, Physical chemistry, Monomers

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