Energy Transfer and Energy-Coupling Processes

Hauska, Günter; Whitmarsh, John; Joliot, Pierre; Joliot, Anne; Prince, R. C.; Haehnel, Wolfgang; Melandri, B. Andrea; Venturoli, Giovanni; Dilley, Richard A.; McCarty, Richard E.; Nalin, Carlo M.; Strotmann, Heinrich; Sandmann, Gerhard; Böger, Peter

doi:10.1007/978-3-642-70936-4_10

Photosynthesis III 1986

DOI: 10.1007/978-3-642-70936-4_10

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Energy Transfer and Energy-Coupling Processes

Günter Hauska¹,

John Whitmarsh²,

Pierre Joliot³

et al.

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1991

1992

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Cited by 2 publications

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“…in the inner thylakoid, cytochrome f is a component of the b6f protein complex, and as such is membrane bound. 20 From the amino-acid sequence it has been deduced that a substantial part of cytochrome f exists as a highly charged globular section, which is outside the membrane.16 A procedure has been described for isolating a non-aggregating water-soluble form of cytochrome f from cabbage leaves, e.g. Brassica oleracea, from which residues 250-285 have been cleaved.'…”

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confidence: 99%

Protein–protein cross-reactions involving plastocyanin, cytochrome f and azurin: self-exchange rate constants and related studies with inorganic complexes

Silva¹,

Beoku-Betts²,

Kyritsis³

et al. 1992

J. Chem. Soc., Dalton Trans.

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Protein-protein cross-reactions involving acidic and basic plastocyanins, cytochrome f and azurin, and including reactions between t w o blue copper proteins, have been studied for the first time. The high reactivity of cytochrome f, and properties of the basic Anabaena variabilis plastocyanin, are noted. Reduction potentials for different plastocyanins have been obtained at p H 7-9 and are in the range 340-380 mV. The application of Marcus theory has enabled self-exchange rate constants (25 "C) for acidic parsley (3.3 x l o 3 M-ls-' ) and basic A. variabilis (5.9 x 1 O5 M-l s-l) plastocyanins t o be calculated at pH 7.5, l = 0.1 0 M (NaCI). The influence of overall charge o n the PCu(I)-PCu(II) self-exchange, estimated as -8, -7 in the case of parsley and +1, +2 for A. variabilis, is noted. A mechanism for electron transfer involving contact of adjacent hydrophobic regions on the t w o plastocyanin surfaces giving a Cu 0 Cu separation of 12-14 A is proposed. Rate constants for the cytochrome f(ll) reduction of four PCu(II) plastocyanins (acidic parsley, spinach, Scenedesmus obliquus and basic A. variabilis) are a factor of z 1 O2 less in the case of the basic form. The rate constant for Pseudomonas aeruginosa azurin with cytochrome f has also been determined. The A. variabilis and azurin rate constants give a cytochrome f(ll)-f( Ill) selfexchange of 5.0 x l o 5 M-' s-' at p H 7.5, whereas that obtained from the cross-reaction with the more highly charged parsley PCu(ll) (2.3 x lo8 M-l s-l ) requires correction for work terms, and is predictably out of line. Only one out of four cross-reactions of A. variabilis plastocyanin and azurin with [ C ~( p h e n ) ~] ~+ (phen = 1,lO-phenanthroline) and [Fe(CN)J3-gives a satisfactory fit t o the Marcus theory, indicating an influence of more localised protein charge on these reactions. The absence of a fully developed acidic patch region o n the surface of A. variabilis plastocyanin is discussed. * This value from ref. 35. A value of 5800 M-' cm-' is given in ref. 36.

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mentioning

confidence: 99%

Protein–protein cross-reactions involving plastocyanin, cytochrome f and azurin: self-exchange rate constants and related studies with inorganic complexes

Silva¹,

Beoku-Betts²,

Kyritsis³

et al. 1992

J. Chem. Soc., Dalton Trans.

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Nucleotide sequences of the continuous and separated petA, petB and petD chloroplast genes in Chlamydomonas reinhardtii

et al. 1991

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We have mapped and sequenced the petA (cytf), petB (cytb6) and petD (subunit IV) genes on the chloroplast genome of Chlamydomonas reinhardtii. At variance with the pet genes in higher plant chloroplasts, the petB and petD genes are continuous, not adjacent and not located next to the psbB gene. The corresponding polypeptide sequences are highly conserved when compared with their counterparts from other sources but have a few features specific of algal cytb6/f complexes. In particular the transit sequence of cytf displays unique characteristics when compared with those previously described for cytf in higher plants.

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Energy Transfer and Energy-Coupling Processes

Cited by 2 publications

References 438 publications

Protein–protein cross-reactions involving plastocyanin, cytochrome f and azurin: self-exchange rate constants and related studies with inorganic complexes

Protein–protein cross-reactions involving plastocyanin, cytochrome f and azurin: self-exchange rate constants and related studies with inorganic complexes

Nucleotide sequences of the continuous and separated petA, petB and petD chloroplast genes in Chlamydomonas reinhardtii

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