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- W2000135508 abstract "We have investigated electron spin polarization effects occurring in protonated and perdeuterated reaction centers of Rhodospirillum rubrum with electron spin resonance at 9 and 35 GHz (X- and Q-band). As for Rhodopseudomonas sphaeroides strains 2.4.1 and R-26 (Gast, P. and Hoff, A.J. (1979) Biochim. Biophys. Acta 548, 520–535; Gast, P., Mushlin, R.A. and Hoff, A.J. (1982) J. Phys. Chem. 86, 2886–2891), electron spin polarization effects of the prereduced first quinone acceptor Q−A in R. rubrum are strongly nonuniform. This nonuniformity is due to an anisotropic magnetic coupling between the intermediary bacteriopheophytin acceptor (I−) and Q−A. It is argued that the anisotropy is too strong to arise solely from an anisotropy in the exchange interaction between I− and Q−A and that dipolar contributions to the magnetic coupling between I− and Q−A are important. The anisotropy in the magnetic coupling for reaction centers of Rps. sphaeroides strains 2.4.1 and R-26 is different from that of R. rubrum wild type. The combination of the 4-fold higher resolution at Q-band and the line narrowing upon deuteration has enabled us to obtain the principal g values and two hyperfine interaction constants of the reduced first quinone acceptor Q−A. The principal g values are gx = 2.0067, gy = 2.0056 and gz = 2.0024; the hyperfine constant of the CH2 group at position 1 is 1.6 G and that of the CH3 group at position 2 is 2.1 G. These values are close to those found for ubisemiquinone in vitro (Okamura, M.Y., Debus, R.J., Isaacson, R.A. and Feher, G. (1980) Fed. Proc. 39, 1802; Hales, B.J. (1975) J. Am. Chem. Soc. 97, 5993–5997)." @default.
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- W2000135508 date "1983-04-01" @default.
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- W2000135508 title "Evidence for an anisotropic magnetic interaction between the (bacteriopheophytin) intermediary acceptor and the first quinone acceptor in bacterial photosynthesis" @default.
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- W2000135508 doi "https://doi.org/10.1016/0005-2728(83)90008-7" @default.
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