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Photo-excitation of membrane-bound Rhodobacter sphaeroides reaction centres containing the mutation Ala M260 to Trp (AM260W) resulted in the accumulation of a radical pair state involving the photo-oxidised primary electron donor (P). This state had a lifetime of hundreds of milliseconds and its formation was inhibited by stigmatellin. The absence of the Q A ubiquinone in the AM260W reaction...
Three single-site mutations have been introduced at positions close to the QA ubiquinone in the reaction centre from Rhodobacter sphaeroides. Two of these mutations, Ala M260 to Trp and Ala M248 to Trp, result in a reaction centre that does not support photosynthetic growth of the bacterium, and in which electron transfer to the QA ubiquinone is abolished. In the reaction centre with an Ala to Trp...
Background: Methanol dehydrogenase (MDH) is a bacterial periplasmic quinoprotein; it has pyrrolo-quinoline quinone (PQQ) as its prosthetic group, requires Ca 2+ for activity and uses cytochrome c L as its electron acceptor. Low-resolution structures of MDH have already been determined.Results The structure of the α 2 β 2 tetramer of MDH from Methylobacterium extorquens...
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