151
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Broger C, Nałecz MJ, Azzi A. Interaction of cytochrome c with cytochrome bc1 complex of the mitochondrial respiratory chain. BIOCHIMICA ET BIOPHYSICA ACTA 1980; 592:519-27. [PMID: 6251869 DOI: 10.1016/0005-2728(80)90096-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The binding of cytochrome c to the cytochrome bc1 complex of bovine heart mitochondria was studied. Cytochrome c derivatives, arylazido-labeled at lysine 13 or lysine 22, were prepared and their properties as electron acceptors from the bc1 complex were measured. Mixtures of bc1 complex with cytochrome c derivatives were illuminated with ultraviolet light and afterwards subjected to polyacrylamide gel electrophoresis. The gels were analysed using dual-wavelength scanning at 280 minus 300 and 400 minus 430 nm. It was found that illumination with ultraviolet light in the presence of the lysine 12 derivative produced a diminution of the polypeptide of the bc1 coplex having molecular weight 30 000 (band IV) and formation of a new polypeptide composed of band IV and cytochrome c. Band IV was identified as cytochrome c1, and it was concluded that this hemoprotein interacts with cytochrome c and contains its binding site in complex III of the mitochondrial respiratory chain. Illumination of the bc1 complex in presence of the lysine 22 derivative did not produce changes of the polypeptide pattern.
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152
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Rich PR, Bendall DS. The kinetics and thermodynamics of the reduction of cytochrome c by substituted p-benzoquinols in solution. BIOCHIMICA ET BIOPHYSICA ACTA 1980; 592:506-18. [PMID: 6251868 DOI: 10.1016/0005-2728(80)90095-x] [Citation(s) in RCA: 127] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
1. The mechanisms by which p-benzoquinol and its derivatives reduce cytochrome c in solution have been investigated. 2. The two major reductants are the species QH- (anionic quinol) and Q.- (anionic semiquinone). A minor route of electron transfer from the fully protonated QH2 species can also occur. 3. The relative contributions of these routes to the overall reduction rate are governed by pH, ionic strength and relative reactant concentrations. 4. For a series of substituted p-benzoquinols, the forward rate constant, k1, of the anionic quinol-mediatd reaction is related to the midpoint potential of the QH-/QH. couple involved in the rate-limiting step, as predicted by the theory of Marcus for outer-sphere electron transfer reactions in a bimolecular collision process. 5. A mechanism for the biological quinol oxidation reactions in mitochondria and chloroplasts is proposed based upon the findings with these reactions in solution.
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153
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Assembly of the mitochondrial membrane system. DNA sequence and organization of the cytochrome b gene in Saccharomyces cerevisiae D273-10B. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43467-9] [Citation(s) in RCA: 262] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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154
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Erecińska M, Davis J, Wilson D. Interactions of cytochrome c with mitochondrial membranes. Binding to succinate-cytochrome c reductase. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43442-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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155
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Meunier-Lemesle D, Chevillotte-Brivet P, Pajot P. Cytochrome b-565 in Saccharomyces cerevisiae: use of mutants in the cob-box region of the mitochondrial DNA to study the functional role of this spectral species of cytochrome b. 1. Measurements of cytochromes b-562 and b-565 and selection of revertants devoid of cytochrome b-565. EUROPEAN JOURNAL OF BIOCHEMISTRY 1980; 111:151-9. [PMID: 7002556 DOI: 10.1111/j.1432-1033.1980.tb06087.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In order to study the functional role of the spectral species of cytochrome b-565 observed in mitochondria, genetically manipulated strains of Saccharomyces cerevisiae have been used. Strains have been found which are devoid of cytochrome b-565 under certain conditions and which nevertheless are able to grow on a respirable substrate. Two different methods have been used to determine the cytochrome b-565 content: anaerobic titrations and antimycin-A-induced reduction of cytochrome b-565. Both yield the same results.
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156
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Engel WD, Schägger H, von Jagow G. Ubiquinol-cytochrome c reductase (EC 1.10.2.2). Isolation in triton X-100 by hydroxyapatite and gel chromatography. Structural and functional properties. BIOCHIMICA ET BIOPHYSICA ACTA 1980; 592:211-22. [PMID: 6250588 DOI: 10.1016/0005-2728(80)90182-6] [Citation(s) in RCA: 92] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
1. A mehod for the isolation of a monodisperse ubiquinol-cytochrome c reductase (complex III) from beef heart mitochondria has been developed. The procedure consists of an enzyme solubilization in Triton X-100 followed by hydroxyapatite and gel chromatography. 2. The minimum unit of the isolated complex is composed of 9 polypeptide subunits with Mr of 49000, 47000, 30000, 25000, 12000, 11000 and 6000. It contains 8 mumol of cytochrome b, 4 mumol of cytochrome c1, 7-8 mumol of nonhemne iron, corresponding to 3.5-4 mumol of the Rieske iron-sulfur protein, less than 1.0 mumol of ubiquinone and about 60 mumol of phospholipids, per g of protein. The specific detergent binding amounts to 0.2g of Triton X-100 per g protein. 3. Cytochrome b exhibits an alpha-absorbance maximum at 562 nm. In redox titrations it reveals two half-reduction potentials, i.e. -10 and + 100 mV, at pH 7.0. The absorbance maximum of cytochrome c1 lies at 553 nm and its half-reduction potential amounts to +250 mV. 4. The reductase reveals electron-transferring activity with ubiquinol-1, -2, -3, and -9 as donor and cytochrome c as acceptor. The activity with ubiquinol-9 was analyzed according to the surface dilution scheme developed for the action of phospholipases. The molecular activity amounts to 75 mol of cytochrome c reduced per s at 20%C. 5. A dissociation constant K's of 5.5 mM has been determined for the Tritonsolubilized enzyme: ubiquinol-containing micelle association. In this case the total concentration of ubiquinol plus Triton X-100 has been substituted for the concentration of binding areas on the ubiquinol-containing micelles. This substitution makes the reasonable assumption that the sum of ubiquinol concentration plus Triton X-100 is proportional to the number of available binding areas. 6. A K'm value of 0.025 was found for ubiquinol-9. This is an analog to the Michaelis constant and is expressed as mol fraction of ubiquinol in the ubiquinol-Triton micelle.
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157
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Ozawa T, Tanaka M, Shimomura Y. Crystallization of the middle part of the mitochondrial electron transfer chain: cytochrome bc1-cytochrome c complex. Proc Natl Acad Sci U S A 1980; 77:5084-6. [PMID: 6254056 PMCID: PMC350000 DOI: 10.1073/pnas.77.9.5084] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Complex III (cytochrome bc1 particle; ubiquinol:ferricytochrome c oxidoreductase, EC 1.10.22) was purified from beef heart mitochondria by affinity chromatography. Phospholipids were depleted by washing the particle with detergent while it still was on the affinity column. The particle first was mixed with an excess of cytochrome c in 1.5% cholate (wt/vol); slow removal of the detergent from the mixture was achieved by dialysis. Freezing of the mixture resulted in crystallization of the cytochrome bc1 particle in the form of a 1:2 complex with cytochrome c. The chemical composition and spectrophotometric properties of the crystal are described. The same crystallization maneuver used in the case of cytochrome oxidase has been demonstrated to be effective in crystallizing the middle part of the mitochondrial electron-transfer chain.
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158
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von Jagow G, Engel WD. Struktur und Funktion des energieumwandelnden Systems der Mitochondrien. Angew Chem Int Ed Engl 1980. [DOI: 10.1002/ange.19800920906] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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159
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Vinogradov AD, Gavrikov VG, Gavrikova EV. Studies on the succinate dehydrogenating system. II. Reconstitution of succinate-ubiquinone reductase from the soluble components. BIOCHIMICA ET BIOPHYSICA ACTA 1980; 592:13-27. [PMID: 7397135 DOI: 10.1016/0005-2728(80)90110-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
1. A protein fraction containing three polypeptides (the major one with Mr < 13 000) was isolated by means of Triton X-100 extraction of submitochondrial particles specifically treated to remove succinate dehydrogenase. 2. The mixing of the protein fraction with the soluble reconstitutively active succinate dehydrogenase results in formation of highly active succinate-DCIP reductase which is sensitive to thenoyltrifluoroacetone or carboxin. 3. The maximal turnover number of succinate dehydrogenase in the succinate-DCIP reductase reaction revealed in the presence of a saturating amount of the protein fraction is slightly higher than that measured with phenazine methosulfate as artificial electron acceptor. 4. The protein fraction greatly increases the stability of soluble succinate dehydrogenase under aerobic conditions. 5. The titration of soluble succinate dehydrogenase by the protein fraction shows that smaller amounts of the protein fraction are required to block the reduction of ferrycyanide by Hipip center than that required to reveal the maximal catalytic capacity of the enzyme. 6. The apparent Km of the reconstituted system for DCIP depends on the amount of protein fraction; the more protein fraction added to the enzyme, the lower the Km value obtained. 7. A comparison of different reconstituted succinate-ubiquinone reductases described in the literature is presented and the possible arrangement of the native and reconstituted succinate-ubiquinone region of the respiratory chain is discussed.
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160
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161
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Roberts H, Smith SC, Marzuki S, Linnane AW. Evidence that cytochrome b is the antimycin-binding component of the yeast mitochondrial cytochrome bc1 complex. Arch Biochem Biophys 1980; 200:387-95. [PMID: 7002042 DOI: 10.1016/0003-9861(80)90368-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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162
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von Jagow G, Engel WD. A model for the cytochrome b dimer of the ubiquinol: cytochrome c oxidoreductase as a proton translocator. FEBS Lett 1980; 111:1-5. [PMID: 6244177 DOI: 10.1016/0014-5793(80)80748-4] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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163
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Respiration-Linked H+ Translocation in Mitochondria: Stoichiometry and Mechanism. CURRENT TOPICS IN BIOENERGETICS 1980. [DOI: 10.1016/b978-0-12-152510-1.50009-2] [Citation(s) in RCA: 106] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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164
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165
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Zum Prinzip der Photophosphorylierung und oxidativen Phosphorylierung. Naturwissenschaften 1979. [DOI: 10.1007/bf00368807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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166
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van den Berg W, Prince R, Bashford C, Takamiya K, Bonner W, Dutton P. Electron and proton transport in the ubiquinone cytochrome b-c2 oxidoreductase of Rhodopseudomonas sphaeroides. Patterns of binding and inhibition by antimycin. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(19)86934-x] [Citation(s) in RCA: 76] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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167
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Trumpower B, Edwards C. Purification of a reconstitutively active iron-sulfur protein (oxidation factor) from succinate . cytochrome c reductase complex of bovine heart mitochondria. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(19)86947-8] [Citation(s) in RCA: 212] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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168
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Rich PR, Bendall DS. A mechanism for the reduction of cytochromes by quinols in solution and its relevance to biological electron transfer reactions. FEBS Lett 1979; 105:189-94. [PMID: 488347 DOI: 10.1016/0014-5793(79)80608-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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169
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Mitchell P. David Keilins Konzept der Atmungskette und dessen chemiosmotische Konsequenzen (Nobel-Vortrag). Angew Chem Int Ed Engl 1979. [DOI: 10.1002/ange.19790910907] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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170
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Wingfield P, Arad T, Leonard K, Weiss H. Membrane crystals of ubiquinone:cytochrome c reductase from Neurospora mitochondria. Nature 1979; 280:696-7. [PMID: 157435 DOI: 10.1038/280696a0] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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171
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Weiss H, Kolb HJ. Isolation of mitochondrial succinate: ubiquinone reductase, cytochrome c reductase and cytochrome c oxidase from Neurospora crassa using nonionic detergent. EUROPEAN JOURNAL OF BIOCHEMISTRY 1979; 99:139-49. [PMID: 226365 DOI: 10.1111/j.1432-1033.1979.tb13240.x] [Citation(s) in RCA: 189] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The electron transfer complexes, succinate: ubiquinone reductase, ubiquinone: cytochrome c reductase, and cytochrome c: O2 oxidase were isolated from the mitochondrial membranes of Neurospora crassa by the following steps. Modification of the contents of the complexes in mitochondria by growing cells on chloramphenicol; solubilisation of the complexes by Triton X-100; affinity chromatography on immobilized cytochrome c and ion exchange and gel chromatography. Ubiquinone reductase was obtained in a monomeric form (Mr approximately 130 000) consisting of a flavin subunit (Mr 72 000) an iron-sulfur subunit (Mr 28 000) and a cytochrome b subunit (Mr probably 14 000). Cytochrome c reductase was obtained in a dimeric form (Mr approximately 550 000), the monomeric unit comprising the cytochromes b (Mr each 30 000), a cytochrome c1 (Mr 31 000), the iron-sulfur subunit (Mr 25 000), and six subunits without known prosthetic groups (Mr 9000, 11 000, 14 000, 45 000, 45 000, and 52 000). Cytochrome c oxidase was also isolated in a dimeric form (Mr approximately 320 000) comprising two copies each of seven subunits (Mr 9000, 12 000, 14 000, 18 000, 21 000, 29 000, and 40 000). The complexes were essentially free of phospholipid. Each bound one micelle of Triton X-100 (Mr approximately 90 000). After isolation, the bound Triton X-100 could be replaced by other nonionic detergents such as: alkylphenyl polyoxyethylene ethers, alkyl polyoxyethylene ethers and acyl polyoxyethylene sorbitan esters.
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172
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DasGupta U, Wharton DC, Rieske JS. Detection of conformational changes in complex III of the respiratory chain by a maleimido spin label. J Bioenerg Biomembr 1979; 11:79-95. [PMID: 233472 DOI: 10.1007/bf00743197] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Changes in the conformation of Complex III (CoQH2-cytochrome c reductase) of the mitochondrial respiratory chain were detected upon oxidoreduction using the nitroxide spin label, 3-(maleimidomethyl)-2,2,5,5-tetramethyl-1-pyrrolidinyloxyl. EPR spectra of the spin label show a transition from a greater to a lesser degree of immobilization when the labeled enzyme, reduced either with ascorbate or sodium dithionite, is oxidized with potassium ferricyanide or ferricytochrome c. These observations are interpreted to indicate that Complex III is more compact in the reduced state at least in the locality of the spin label. An apparent increase in the concentration of total spins during oxidation of the complex suggests change in the interaction between the spin label and other paramagnetic centers and not an oxidation of spin label, itself, since reduced free spin label could not be reoxidized. Addition of antimycin A had no effect on the EPR spectrum of the spin-labeled enzyme, indicating that this inhibitor does not initiate a conformational change in the region of the spin label. Experiments in which N-ethyl-[2-3H] maleimide was bound to Complex III show that binding occurs primarily to a subunit with a molecular weight of 45,000. Although no qualitative differences were observed, it was found that less radioactivity appears in samples reduced with dithionite than in those reduced with ascorbate. This difference appears to be caused by decomposition products of dithionite.
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173
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de Vries S, Albracht SP, Leeuwerik FJ. The multiplicity and stoichiometry of the prosthetic groups in QH2: cytochrome c oxidoreductase as studied by EPR. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 546:316-33. [PMID: 221014 DOI: 10.1016/0005-2728(79)90049-5] [Citation(s) in RCA: 120] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
1. The EPR signal in the g = 2 region of the reduced QH2: cytochrome c oxidoreductase as present in submitochondrial particles and the isolated enzyme is an overlap of two signals in a 1 : 1 weighted ratio. Both signals are due to [2Fe-2S]+1 centers. 2. From the signal intensity it is computed that the concentration of each Fe-S center is half that of cytochrome c1. 3. The line shape of one of the Fe-S centers, defined as center 1, is reversibly dependent on the redox state of the b-c1 complex. The change of the line shape cannot be correlated with changes of the redox state of any of the cytochromes in QH2: cytochrome c oxidoreductase. 4. Lie the optical spectrum, the EPR spectrum of the cytochromes is composed of the absorption of at least three different b cytochromes and cytochrome c1. 5. The molar ratio of the prosthetic groups was found to be c1 : b-562 : b-566 : b-558 : center 1 : center 2 = 2 : 2 : 1 : 1 : 1 : 1. The consequences of this stoichiometry are discussed in relation to the basic enzymic unit of QH2 : cytochrome c oxidoreductase.
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174
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175
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Trumpower BL, Edwards CA. Identification of oxidation factor as a reconstitutively active form of the iron-sulfur protein of the cytochrome b-c1 segment of the respiratory chain. FEBS Lett 1979; 100:13-6. [PMID: 220085 DOI: 10.1016/0014-5793(79)81121-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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176
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Regulatory interactions between mitochondrial genes. I. Genetic and biochemical characterization of some mutant types affecting apocytochrome b and cytochrome oxidase. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(17)30247-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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177
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Walz D. Thermodynamics of oxidation-reduction reactions and its application to bioenergetics. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 505:279-353. [PMID: 219888 DOI: 10.1016/0304-4173(79)90007-7] [Citation(s) in RCA: 110] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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178
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179
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Hatefi Y, Galante YM, Stiggall DL, Ragan CI. Proteins, polypeptides, prosthetic groups, and enzymic properties of complexes I, II, III, IV, and V of the mitochondrial oxidative phosphorylation system. Methods Enzymol 1979; 56:577-602. [PMID: 459885 DOI: 10.1016/0076-6879(79)56056-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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180
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Capaldi RA, Briggs MM, Smith RJ. Cleavable bifunctional reagents for studying near neighbor relationships among mitochondrial inner membrane complexes. Methods Enzymol 1979; 56:630-42. [PMID: 223012 DOI: 10.1016/0076-6879(79)56060-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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181
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Ilan Y. Internal electron transfer within mitochondrial succinate-cytochrome c reductase. Biochem Biophys Res Commun 1978; 85:1261-7. [PMID: 217385 DOI: 10.1016/0006-291x(78)91139-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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182
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Reed J, Reed TA, Hess B. Circular-dichroism studies of the cytochrome b-c1 complex of Saccharomyces cerevisiae. EUROPEAN JOURNAL OF BIOCHEMISTRY 1978; 91:255-61. [PMID: 214303 DOI: 10.1111/j.1432-1033.1978.tb20960.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
1. Circular dichroism studies on the Soret region of the cytochrome b-c1 complex of yeast reveal a change in the dichroism of cytochrome c1 depending on the redox state of cytochrome b, indicating a conformational interaction between both cytochromes. 2. This interaction is not influenced by binding of the inhibitor antimycin A to the complex, so that the interaction does not appear to be involved in the mechanism of electron transport through the complex. 3. Antimycin A binding causes a complex set of changes in the CD spectrum of the complex, which can be attributed to a severe and specific distortion of the environment of the chromophore of cytochrome b.
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183
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Arutjunjan AM, Kamensky YA, Milgröm E, Surkov S, Konstantinov AA, Sharonov YA. Is mitochondrial cytochrome b-566/558 a single hemoprotein or two individual components? A magnetic circular dichroism study. FEBS Lett 1978; 95:40-4. [PMID: 720604 DOI: 10.1016/0014-5793(78)80047-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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184
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Malkin R, Bearden AJ. Membrane-bound iron-sulfur centers in photosynthetic systems. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 505:147-81. [PMID: 214111 DOI: 10.1016/0304-4173(78)90011-3] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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185
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186
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Izzo G, Guerrieri F, Papa S. On the mechanism of inhibition of the respiratory chain by 2-heptyl-4-hydroxyquinoline-N-oxide. FEBS Lett 1978; 93:320-2. [PMID: 710584 DOI: 10.1016/0014-5793(78)81130-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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187
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Smith RJ, Capaldi RA, Muchmore D, Dahlquist F. Cross-linking of ubiquinone cytochrome c reductase (complex III) with periodate-cleavable bifunctional reagents. Biochemistry 1978; 17:3719-23. [PMID: 212103 DOI: 10.1021/bi00611a007] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Two novel cross-linkers, disuccinimidyl tartarate (DST) and N,N'-bis(3-succinimidyloxycarbonylpropyl)tartaramide (SPT), have been synthesized. These reagents span 6 and 18 A, respectively, between functional groups and contain a vic-glycol bond which can be cleaved with periodate under mild reaction conditions. Both DST and SPT have been used to examine the near-neighbor relationships of polypeptides in ubiquinone cytochrome c reductase (complex III) from beef heart mitochondria. Among the cross-linked products resolved were pairs containing I + II, II + VI, I + V, and VI + VII. Polypeptides III and IV, a cytochrome b aproprotein, and the cytochrome c1 hemoprotein, respectively, were also resolved in several cross-linked products.
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188
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Weiss H, Juchs B. Isolation of a multiprotein complex containing cytochrome b and c1 from Neurospora crassa mitochondria by affinity chromatography on immobilized cytochrome c. Difference in the binding between ferricytochrome c and ferrocytochrome c to the multiprotein complex. EUROPEAN JOURNAL OF BIOCHEMISTRY 1978; 88:17-28. [PMID: 27360 DOI: 10.1111/j.1432-1033.1978.tb12418.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A multiprotein complex which contains in equimolar amounts two cytochromes b (Mr each about 27,000), one cytochrome c1 (Mr 31,000) and six subunits without known prosthetic groups (Mr 8000, 12,000, 14,000, 45,000, 45,000, and 50,000) has been isolated from the mitochondrial membranes of Neurospora crassa by affinity chromatography on immobilized cytochrome c. The chromatographic separation was based upon the specific binding of the complex to ferricytochrome c coupled to Sepharose and its specific release upon conversion of the coupled ferricytochrome c into ferrocytochrome c using ascorbate as a reductant. The chromatography was performed in the presence of the nonionic detergent Triton X-100 at low ionic strengths. A monodisperse preparation of the multiprotein complex was obtained which was used for binding studies with cytochrome c from Neurospora crassa, horse heart and Saccaromyces cerevisiae. At low ionic strength (20 mM Trisacetate) and slightly alkaline pH (pH 7 to 8), more than one molecule of ferricytochrome c were bound to the isolated multiprotein complex with dissociation constants below 1 x 10(-7) M. One of these bindings appeared different from the others, since its high affinity was preserved at an ionic strength at which the affinities of the other bindings decreased. Furthermore, the affinity of only this binding decreased upon reduction of cytochrome c. It is suggested that this binding is at or near the functionally active site(s) of the mulipprotein complex.
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189
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White CC, Chain RK, Malkin R. Duroquinol as an electron donor for chloroplast electron transfer reactions. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 502:127-37. [PMID: 638137 DOI: 10.1016/0005-2728(78)90137-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Duroquinol (tetramethylhydroquinone) was found to function as an electron donor in chloroplasts. Non-cyclic electron transfer from duroquinol to electron acceptors such as oxygen proceeded at high rates, was insensitive to 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) but was sensitive to the plastoquinone antagonist 2,5-dibromo-3-methyl-6-isopropyl-1,4-benzoquinone (DBMIB). The electron transport from duroquinol was coupled to the synthesis of ATP. Spectroscopic studies of chloroplast electron carriers in the dark indicated the high-potential "Rieske" iron-sulfur center, cytochrome f, plastocyanin and P-700 were all reduced by duroquinol. The dark reduction of the "Rieske" iron-sulfur center and cytochrome f were inhibited by DBMIB but not by DCMU. These results have been interpreted in terms of a linear sequence of electron carriers in the non-cyclic electron transport chain which includes plastoquinone, the "Rieske" iron-sulfur center, cytochrome f, plastocyanin and P-700.
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190
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Hatefi Y. Preparation and properties of dihydroubiquinone: cytochrome c oxidoreductase (complex III). Methods Enzymol 1978; 53:35-40. [PMID: 213685 DOI: 10.1016/s0076-6879(78)53010-3] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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191
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Weiss H, Juchs B, Ziganke B. Complex III from mitochondria on Neurospora crassa: purification, characterization, and resolution. Methods Enzymol 1978; 53:98-112. [PMID: 213696 DOI: 10.1016/s0076-6879(78)53018-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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192
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von Jagow G, Schägger H, Engel WD, Riccio P, Kolb HJ, Klingenberg M. Complex III from beef heart: isolation by hydroxyapatite chromatography in Triton X-100 and characterization. Methods Enzymol 1978; 53:92-8. [PMID: 213695 DOI: 10.1016/s0076-6879(78)53017-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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193
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194
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Brautigan DL, Ferguson-Miller S, Margoliash E. Mitochondrial cytochrome c: preparation and activity of native and chemically modified cytochromes c. Methods Enzymol 1978; 53:128-64. [PMID: 213675 DOI: 10.1016/s0076-6879(78)53021-8] [Citation(s) in RCA: 313] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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195
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von Jagow G, Schägger H, Riccio P, Klingenberg M, Kolb HJ. b.c1 complex from beef heart: hydrodynamic properties of the complex prepared by a refined hydroxyapatite chromatography in trition X-100. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 462:549-58. [PMID: 202306 DOI: 10.1016/0005-2728(77)90100-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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196
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Michaelis G, Pratje E. Mapping of the two mitochondrial antimycin A resistance loci in Saccharomyces cerevisiae. MOLECULAR & GENERAL GENETICS : MGG 1977; 156:79-85. [PMID: 340894 DOI: 10.1007/bf00272255] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Retention or loss of the two new mitochondrial antimycin A resistance loci AI and AII has been analyzed in a large number of stable cytoplasmic petite mutants. Using these deletion mutants it was possible to localize the two antimycin A resistance loci in the OI--OII region of mitochondrial DNA. The genetic loci are mapped in the following order: OII--AI--AII--cobl--OI. The mapping relationship of mutants resistant to antimycin A or funiculosin to various cob mutants is described.
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197
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Smith RJ, Capaldi RA. Nearest neighbor relationships of the polypeptides in ubiquinone cytochrome c reductase (complex III). Biochemistry 1977; 16:2629-33. [PMID: 196617 DOI: 10.1021/bi00631a008] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ubiquinone cytochrome c reductase (complex III) in detergent dispersion has been cross-linked with two reversible cross-linking agents dithiobissuccinimidylpropionate and dimethyl-3.3'-dithiobispropionimidate and the cross-linked products formed have been analyzed by two-dimensional gel electrophoresis. Under mild reaction conditions, polypeptides I and II, II and VI, I and V, and VI and VII were the most prominent subunit pairs seen. With higher levels of reagent, larger aggregates were produced until an aggregate of apparent molecular weight 310 000 was the dominant band on gels. This is the complex III monomer.
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198
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Mitchell P. A commentary on alternative hypotheses of protonic coupling in the membrane systems catalysing oxidative and photosynthetic phosphorylation. FEBS Lett 1977; 78:1-20. [PMID: 17549 DOI: 10.1016/0014-5793(77)80263-9] [Citation(s) in RCA: 149] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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199
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Obbink DJ, Spithill TW, Maxwell RJ, Linnane AW. Biogenesis of mitochondria 48: mikamycin resistance in Saccharomyces cerevisiae--a mitochondrial mutation conferring resistance to an antimycin A-like contaminant in mikamycin. MOLECULAR & GENERAL GENETICS : MGG 1977; 151:127-36. [PMID: 406512 DOI: 10.1007/bf00338687] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Commercial preparations of mikamycin have been shown to act as both inhibitors of mitochondrial protein synthesis and respiration. These preparations are shown to consist of two major streptogramin components (mikamycin A and mikamycin B) and a number of minor components. The major streptogramin components which inhibit mitochondrial protein synthesis in vitro are without effect in vivo due to whole cell impermeability to these compounds. A minor antimycin A-like component is the active compound in mikamycin preparations which inhibits growth of yeast cells on ethanol. The site of this inhibition is at the level of respiratory Comples III. The mitochondrial [mik 1-r] mutation confers resistance to this minor growth inhibitory component and cross resistance to antimycin A. For clarity the designation mik 1 has therefore been renamed ana 1 to denote the mitochondrial determinant conferring resistance to antimycin A. Genetic and physical mapping studies localise the ana 1 determinant in the region of mitochondrial DNA specifying cytochrome b. It is proposed that the ana 1 locus is part of a gene specifying a membrane component of Complex III.
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200
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Baum H, Pollak JK. Iron centres and rate-limiting spans in the respiratory chains of mitochondria from adult and fetal rats. CIBA FOUNDATION SYMPOSIUM 1976:79-90. [PMID: 1052039 DOI: 10.1002/9780470720325.ch4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The respiratory chain is a mosaic of complexes functionally linked through the mobile intermediates ubiquinone and cytochrome c. Changes in content of complexes that are not rat-limiting might not be reflected in the overall respiratory rate but may be revealed by titration with specific inhibitors. Oxidation of succinate by membranes of liver mitochondria from fetal, adult and starved rats was titrated with antimycin. Initial respiratory rates were similar but antimycin-titration curves were markedly different. The results indicate that the content of Complex III (cytochrome b-c1 span) is much lower in mitochondria from fetal and starved adult rats than in controls. In no case however is Complex III initially rat-limiting, and in fetal and starved adult rats it seems that a much lower content of functional Complex III is required to sustain a given respiratory rate. A possible explanation is a compensatory optimization of the pool function of ubiquinone, through increases in its content or its mobility in the mitochondrial membrane.
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