1996
DOI: 10.1073/pnas.93.14.6998
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Kinetics of photo-induced electron transfer from high-potential iron-sulfur protein to the photosynthetic reaction center of the purple phototroph Rhodoferax fermentans.

Abstract: The kinetics of photo-induced electron transfer from high-potential iron-sulfur protein (HiPIP) to the photosynthetic reaction center (RC) of the purple phototroph Rhodoferaxfermentans were studied. The rapid photooxidation of heme c-556 belonging to RC is followed, in the presence of HiPIP, by a slower reduction having a second-order rate constant of4.8 x 107 M -l s -1. The limiting value of k.bs at high HiPIP concentration is 95 s-1. The amplitude of this slow process decreases with increasing HiPIP concentr… Show more

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Cited by 65 publications
(45 citation statements)
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“…While the mitochondrial and bacterial enzymes are referred to as cyt bc 1 , the homologous enzyme in plant and algal chloroplasts and cyanobacteria is called plastohydroquinone : plastocyanin oxidoreductase or cyt b 6 f (for a review see Cramer et al 1996;Cramer et al 2004). In all cases, these energy transducing enzymes transfer electrons from a hydroquinone derivative (QH 2 ) (usually ubihydroquinone, menahydroquinone or plastohydroquinone), to an electron carrier molecue such as a c type cyt, a high potential iron sulfur protein (HiPIP) or a plastocyanin ( (Jenney and Daldal 1993;Jenney et al 1994;Hochkoeppler et al 1996;Kerfeld et al 1996) ). They are central players in respiration and photosynthesis as they contribute to the generation of an electrochemical potential ∆µH + , subsequently used for ATP production via the ATP synthase (Mitchell 1976;Dutton et al 1998;Saraste 1999).…”
Section: Introductionmentioning
confidence: 99%
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“…While the mitochondrial and bacterial enzymes are referred to as cyt bc 1 , the homologous enzyme in plant and algal chloroplasts and cyanobacteria is called plastohydroquinone : plastocyanin oxidoreductase or cyt b 6 f (for a review see Cramer et al 1996;Cramer et al 2004). In all cases, these energy transducing enzymes transfer electrons from a hydroquinone derivative (QH 2 ) (usually ubihydroquinone, menahydroquinone or plastohydroquinone), to an electron carrier molecue such as a c type cyt, a high potential iron sulfur protein (HiPIP) or a plastocyanin ( (Jenney and Daldal 1993;Jenney et al 1994;Hochkoeppler et al 1996;Kerfeld et al 1996) ). They are central players in respiration and photosynthesis as they contribute to the generation of an electrochemical potential ∆µH + , subsequently used for ATP production via the ATP synthase (Mitchell 1976;Dutton et al 1998;Saraste 1999).…”
Section: Introductionmentioning
confidence: 99%
“…These two proteins interact physically with very different electron acceptors: a c-type cyt (cyt c, c 2 , c y or c 8 ) (Jenney et al 1994;Kerfeld et al 1996) or a high potential iron-sulfur protein (HiPIP) (Hochkoeppler et al 1996) in the case of the cyt c 1 versus plastocyanin or a c-type cyt (cyt c 6 ) in the case of the cyt f (Cramer et al 1996). Moreover, the pH of the environment in which these subunits perform their specific functions is very different between the bacteria, mitochondria and chloroplasts.…”
mentioning
confidence: 99%
“…The photo-induced electron transfer from Rf: fermentans Hipip to the photosynthetic RC involves the formation of a Hipip/RC complex (Kd approximately 2.5 pM) characterized by mainly electrostatic interactions, involving 5 -6 specific ionic pairs [13]. In an effort to establish the protein surface patch that is involved in protein-protein complex formation between the soluble Hipips and membrane-bound redox complexes such as bc, and RC, we have followed the approach previously applied to cytochromes c 1491 and the photoactive yellow protein [50].…”
Section: ---8 3 A3mentioning
confidence: 99%
“…This process follows multiphasic kinetics, with a fast phase occumng within a HipiplRC complex [13]. The high value of this electron transfer rate (t,,* = 2.2 ps) suggests a physiological role for Hipip in photocyclic electron transfer [13]. Recent evidence pointing to a physiological role for Hipips has also been established in Ru.…”
mentioning
confidence: 93%
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