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- W2003114411 abstract "We have recently demonstrated, using site-directed mutagenesis, that soluble cytochromes interact with the Rubrivivax gelatinosus photosynthetic reaction center (RC) in the vicinity of the low-potential heme 1 (c-551, Em = 70 mV) of the tetraheme cytochrome subunit, the fourth heme from the special pair of bacteriochlorophyll [Osyczka, A., et al. (1998) Biochemistry 37, 11732−11744]. Although the mutations generated in that study did not show clear effects on the electron transfer from high-potential iron−sulfur protein (HiPIP), which is the major physiological electron donor to the RC in this bacterium, we report here that other site-directed mutations near the solvent-exposed edge of the same low-potential heme 1, V67K (valine-67 substituted by lysine) and E79K/E85K/E93K (glutamates-79, -85, and -93, all replaced by lysines), considerably inhibit the electron transfer from HiPIP to the RC. Thus, it is concluded that HiPIP, like soluble cytochromes, binds to the RC in the vicinity of the exposed part of the low-potential heme 1 of the cytochrome subunit, although some differences in the configurations of the HiPIP−RC and cytochrome c−RC transient complexes may be postulated." @default.
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- W2003114411 date "1999-02-19" @default.
- W2003114411 modified "2023-09-26" @default.
- W2003114411 title "Interaction Site for High-Potential Iron−Sulfur Protein on the Tetraheme Cytochrome Subunit Bound to the Photosynthetic Reaction Center of <i>Rubrivivax gelatinosus</i>" @default.
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- W2003114411 doi "https://doi.org/10.1021/bi982747w" @default.
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