Abstract
Magnetophotoselection experiments were performed on the triplet state of Rhodopseudomonas viridis reaction center complexes isolated with the detergent sodium dodecyl sulfate. The angles between the optical transition moments of the reaction center chromophores and the triplet magnetic axes were determined. None of the transition moments of the spectroscopic forms of bacteriochlorophyll b in the reaction center lies along any of the triplet magnetic axes, in contrast to the situation in Rhodopseudomonas sphaeroides and Rhodospirillum rubrum. The magnetophotoselection results for Rps. viridis are combined with data from other orientation studies (Paillotin, G., Vermeglio, A. and Breton, J. (1979) Biochim. Biophys. Acta 545, 249–264; Frank, H.A., Friesner, R., Nairn, J.A., Dismukes, G.C. and Sauer, K. (1979) Biochim. Biophys. Acta 547, 484–501) to construct a diagram showing the relative orientations of the reaction center optical transition moments and the triplet magnetic axes of the primary donor with respect to the membrane plane.
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