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- W2008975052 abstract "In reaction centers of Rhodobacter (Rb.) capsulatus, the M43Asn --> Asp substitution is capable of restoring rapid rates for delivery of the second proton to QB in a mutant that lacks L212Glu. Flash-induced absorbance spectroscopy was used to show a nearly native rate for transfer of the second proton to QB (approximately 700 s-1) in the L212Gln+M43Asp double-mutant reaction center; this rate was shown to decrease more than 1000-fold in the photoincompetent L212Glu --> Gln mutant [Miksovska, J., Kálmán, L., Maróti, P., Schiffer, M., Sebban, P., and Hanson, D.K. (1997) Biochemistry 36, 12216-12226]. In Rb. sphaeroides, the equivalent M44Asn --> Asp mutation was reported to restore the rate of transfer of the first proton to a wild-type level when it is added to the L213Asp --> Asn photoincompetent mutant [Rongey, S.H., Paddock, M.L., Feher, G., and Okamura, M.Y. (1993) Proc. Natl. Acad. Sci. U.S.A. 90, 1325-1329]. It is remarkable that the same second-site mutation can compensate for both of these mutations which severely impair reaction center function by blocking two different proton-transfer reactions. We suggest that residue M43Asp is situated in a key position which can link pathways for delivery of both the first and second protons (involving structured water molecules) to QB." @default.
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- W2008975052 date "1998-02-01" @default.
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- W2008975052 title "In Bacterial Reaction Centers, a Key Residue Suppresses Mutational Blockage of Two Different Proton Transfer Steps" @default.
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- W2008975052 doi "https://doi.org/10.1021/bi972696n" @default.
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