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Finke N, Hoehler TM, Polerecky L, Buehring B, Thamdrup B. Competition for inorganic carbon between oxygenic and anoxygenic phototrophs in a hypersaline microbial mat, Guerrero Negro, Mexico. Environ Microbiol 2013; 15:1532-50. [PMID: 23347091 DOI: 10.1111/1462-2920.12032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Accepted: 10/24/2012] [Indexed: 11/28/2022]
Abstract
While most oxygenic phototrophs harvest light only in the visible range (400-700 nm, VIS), anoxygenic phototrophs can harvest near infrared light (> 700 nm, NIR). To study interactions between the photosynthetic guilds we used microsensors to measure oxygen and gross oxygenic photosynthesis (gOP) in a hypersaline microbial mat under full (VIS + NIR) and VIS illumination. Under normal dissolved inorganic carbon (DIC) concentrations (2 mM), volumetric rates of gOP were reduced up to 65% and areal rates by 16-31% at full compared with VIS illumination. This effect was enhanced (reduction up to 100% in volumetric, 50% in areal rates of gOP) when DIC was lowered to 1 mM, but diminished at 10 mM DIC or lowered pH. In conclusion, under full-light illumination anoxygenic phototrophs are able to reduce the activity of oxygenic phototrophs by efficiently competing for inorganic carbon within the highly oxygenated layer. Anoxygenic photosynthesis, calculated from the difference in gOP under full and VIS illumination, represented between 10% and 40% of the C-fixation. The DIC depletion in the euphotic zone as well as the significant C-fixation by anoxygenic phototrophs in the oxic layer influences the carbon isotopic composition of the mat, which needs to be taken into account when interpreting isotopic biosignals in geological records.
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Affiliation(s)
- Niko Finke
- Nordic Center for Earth Evolution, Institute of Biology, University of Southern Denmark, Odense, Denmark.
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2
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Lu H, Zhang G, Dong S. Quantitative study of PNSB energy metabolism in degrading pollutants under weak light-micro oxygen condition. BIORESOURCE TECHNOLOGY 2011; 102:4968-4973. [PMID: 21354790 DOI: 10.1016/j.biortech.2011.01.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Revised: 01/10/2011] [Accepted: 01/12/2011] [Indexed: 05/30/2023]
Abstract
Contribution and relationship between oxidative phosphorylation and photophosphorylation pathways in purple non-sulfur bacteria (PNSB) wastewater treatment under weak light-micro oxygen condition were studied quantitatively. Results showed that under weak light-anaerobic condition, PNSB followed photophosphorylation with the first-order degradation kinetic constant k(3) of 0.0585. Under dark-micro aerobic condition, it followed oxidative phosphorylation with k(2) of 0.0896. Under weak light-micro oxygen condition, both pathways existed with k(1) of 0.108. When light and oxygen both existed, oxidative phosphorylation had a strong competitiveness, it played a dominative role and counted for 92.7% in pollutants degradation, and meanwhile photophosphorylation was restrained by 81.6%. Theoretical analysis showed the common part from coenzyme Q (CoQ) to cytochrome c2 (Cyt c2) in both respiration and photosynthetic chains might cause the competition. When oxygen existed, respiration electron transport would be enhanced. Other potential explanations included that oxygen might damage the pigment and membrane system vital to photophosphorylation.
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Affiliation(s)
- Haifeng Lu
- State Key Laboratory of Urban Water Resource Environment, Harbin Institute of Technology, Harbin 150090, China
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3
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Kojadinovic M, Laugraud A, Vuillet L, Fardoux J, Hannibal L, Adriano JM, Bouyer P, Giraud E, Verméglio A. Dual role for a bacteriophytochrome in the bioenergetic control of Rhodopsdeudomonas palustris: Enhancement of photosystem synthesis and limitation of respiration. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2008; 1777:163-72. [DOI: 10.1016/j.bbabio.2007.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Revised: 08/30/2007] [Accepted: 09/04/2007] [Indexed: 10/22/2022]
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4
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Borsetti F, Francia F, Turner RJ, Zannoni D. The thiol:disulfide oxidoreductase DsbB mediates the oxidizing effects of the toxic metalloid tellurite (TeO32-) on the plasma membrane redox system of the facultative phototroph Rhodobacter capsulatus. J Bacteriol 2006; 189:851-9. [PMID: 17098900 PMCID: PMC1797329 DOI: 10.1128/jb.01080-06] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The highly toxic oxyanion tellurite (TeO3(2-)) is a well known pro-oxidant in mammalian and bacterial cells. This work examines the effects of tellurite on the redox state of the electron transport chain of the facultative phototroph Rhodobacter capsulatus, in relation to the role of the thiol:disulfide oxidoreductase DsbB. Under steady-state respiration, the addition of tellurite (2.5 mM) to membrane fragments generated an extrareduction of the cytochrome pool (c- and b-type hemes); further, in plasma membranes exposed to tellurite (0.25 to 2.5 mM) and subjected to a series of flashes of light, the rate of the QH2:cytochrome c (Cyt c) oxidoreductase activity was enhanced. The effect of tellurite was blocked by the antibiotics antimycin A and/or myxothiazol, specific inhibitors of the QH2:Cyt c oxidoreductase, and, most interestingly, the membrane-associated thiol:disulfide oxidoreductase DsbB was required to mediate the redox unbalance produced by the oxyanion. Indeed, this phenomenon was absent from R. capsulatus MD22, a DsbB-deficient mutant, whereas the tellurite effect was present in membranes from MD22/pDsbB(WT), in which the mutant gene was complemented to regain the wild-type DsbB phenotype. These findings were taken as evidence that the membrane-bound thiol:disulfide oxidoreductase DsbB acts as an "electron conduit" between the hydrophilic metalloid and the lipid-embedded Q pool, so that in habitats contaminated with subinhibitory amounts of Te(IV), the metalloid is likely to function as a disposal for the excess reducing power at the Q-pool level of facultative phototrophic bacteria.
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Affiliation(s)
- Francesca Borsetti
- Department of Biology, University of Bologna, Via Irnerio 42, 40126 Bologna, Italy
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Forti G, Agostiano A, Barbato R, Bassi R, Brugnoli E, Finazzi G, Garlaschi FM, Jennings RC, Melandri BA, Trotta M, Venturoli G, Zanetti G, Zannoni D, Zucchelli G. Photosynthesis research in Italy: a review. PHOTOSYNTHESIS RESEARCH 2006; 88:211-40. [PMID: 16755326 DOI: 10.1007/s11120-006-9054-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2005] [Accepted: 02/24/2006] [Indexed: 05/10/2023]
Abstract
This historical review was compiled and edited by Giorgio Forti, whereas the other authors of the different sections are listed alphabetically after his name, below the title of the paper; they are also listed in the individual sections. This review deals with the research on photosynthesis performed in several Italian laboratories during the last 50 years; it includes research done, in collaboration, at several international laboratories, particularly USA, UK, Switzerland, Hungary, Germany, France, Finland, Denmark, and Austria. Wherever pertinent, references are provided, especially to other historical papers in Govindjee et al. [Govindjee, Beatty JT, Gest H, Allen JF (eds) (2005) Discoveries in Photosynthesis. Springer, Dordrecht]. This paper covers the physical and chemical events starting with the absorption of a quantum of light by a pigment molecule to the conversion of the radiation energy into the stable chemical forms of the reducing power and of ATP. It describes the work done on the structure, function and regulation of the photosynthetic apparatus in higher plants, unicellular algae and in photosynthetic bacteria. Phenomena such as photoinhibition and the protection from it are also included. Research in biophysics of photosynthesis in Padova (Italy) is discussed by G.M. Giacometti and G. Giacometti (2006).
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Affiliation(s)
- Giorgio Forti
- Istituto di Biofisica del CNR, Sezione di Milano e Dipartimento di Biologia dell'Università degli Studi di Milano, Via Celoria 26, Milan 20133, Italy.
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Borsetti F, Tremaroli V, Michelacci F, Borghese R, Winterstein C, Daldal F, Zannoni D. Tellurite effects on Rhodobacter capsulatus cell viability and superoxide dismutase activity under oxidative stress conditions. Res Microbiol 2005; 156:807-13. [PMID: 15946826 DOI: 10.1016/j.resmic.2005.03.011] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2005] [Revised: 03/08/2005] [Accepted: 03/18/2005] [Indexed: 11/22/2022]
Abstract
Cells of the facultative photosynthetic bacterium Rhodobacter capsulatus (MT1131 strain) incubated with 10 microg ml-1 of the toxic oxyanion tellurite (TeO2-(3)) exhibited an increase in superoxide dismutase activity. The latter effect was also seen upon incubation with sublethal amounts of paraquat, a cytosolic generator of superoxide anions (O2-), in parallel with a strong increase in tellurite resistance (TeR). A mutant strain (CW10) deficient in SenC, a protein with similarities to peroxiredoxin/thiol:disulfide oxidoreductases and a homologue of mitochondrial Sco proteins, was constructed by interposon mutagenesis via the gene transfer agent system. Notably, the absence of SenC affected R. capsulatus resistance to periplasmic O2- generated by xanthine/xanthine oxidase but not to cytosolic O2- produced by paraquat. Further, the absence of SenC did not affect R. capsulatus tellurite resistance. We conclude that: (1) cytosolic-generated O2- enhances TeR of this bacterial species; (2) small amounts of tellurite increase SOD activity so as to mimic the early cell response to oxidative stress; (3) SenC protein is required in protection of R. capsulatus against periplasmic oxidative stress; and finally, (4) SenC protein is not involved in TeR, possibly because tellurite does not generate O-2 at the periplasmic space level.
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Affiliation(s)
- Francesca Borsetti
- Department of Biology, Microbiology Unit, University of Bologna, 40126 Bologna, Italy
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Borsetti F, Toninello A, Zannoni D. Tellurite uptake by cells of the facultative phototrophRhodobacter capsulatusis a ΔpH-dependent process. FEBS Lett 2003; 554:315-8. [PMID: 14623086 DOI: 10.1016/s0014-5793(03)01180-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The uptake by light-grown cells of Rhodobacter capsulatus of the highly toxic metalloid oxyanion tellurite (TeO(3)(2-)) was examined. We show that tellurite is rapidly taken up by illuminated cells in a process which is inhibited by the protonophore carbonyl cyanide-p-trifluoromethoxyphenyl-hydrazone (FCCP) and by the K(+)/H(+) exchanger nigericin. Notably, the light-driven membrane potential (Delta psi) is enhanced by K(2)TeO(3)> or =200 microM. Further, tellurite uptake is largely insensitive to valinomycin, strongly repressed by the sulfhydryl reagent N-ethylethylmaleimide (NEM) and competitively inhibited by phosphate. We conclude that tellurite is transported into cells by a Delta pH-dependent, non-electrogenic process which is likely to involve the phosphate transporter (PiT family).
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Affiliation(s)
- Francesca Borsetti
- Department of Biology, University of Bologna, 42 Irnerio, Bologna 40126, Italy
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Di Tomaso G, Fedi S, Carnevali M, Manegatti M, Taddei C, Zannoni D. The membrane-bound respiratory chain of Pseudomonas pseudoalcaligenes KF707 cells grown in the presence or absence of potassium tellurite. MICROBIOLOGY (READING, ENGLAND) 2002; 148:1699-1708. [PMID: 12055290 DOI: 10.1099/00221287-148-6-1699] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The respiratory chain of Pseudomonas pseudoalcaligenes KF707 in membranes isolated from cells grown in the presence or absence of the toxic oxyanion tellurite (TeO3(2-)) was examined. Aerobic growth in the absence of tellurite shows an NADH-dependent respiration which is 80% catalysed by the cytochrome (cyt) bc1-containing pathway leading to two terminal membrane-bound cyt c oxidases inhibited by different concentrations of KCN (IC50 0.2 and 1 microM). A third oxidase, catalysing the remaining 20% of the cyanide-resistant respiration and fully inhibited by 2-3 mM KCN, is also present; this latter pathway accounts for 60-70% of the total NADH-dependent respiration in membranes from cells grown in LB medium supplemented with potassium tellurite (35 microg x ml(-1)). Two high-potential b-type haems (E(m,7) +395 and 318 mV) are redox centres of a membrane-bound cyt c oxidase (possibly of the cbb3 type) which shows a 50% decrease of its activity in parallel with a similar decrease of the c-type haem content (mostly soluble cyt c) in membranes from tellurite-grown cells; the latter type of cells specifically contain a cyt b type at +203 mV (pH 9.0) which is likely to be involved in cyanide-resistant respiration. Comparison of the growth curve of KF707 cells in parallel with tellurite uptake showed that intracellular accumulation of tellurium (Te(0)) crystallites starts from the mid-exponential growth phase, whereas tellurite-induced changes of the respiratory chain are already evident during the early stages of growth. These data were interpreted as showing that reduction of tellurite to tellurium and tellurite-dependent modifications of the respiratory chain are unrelated processes in P. pseudoalcaligenes KF707.
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Affiliation(s)
- Giovanna Di Tomaso
- Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna I, Italy1
| | - Stefano Fedi
- Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna I, Italy1
| | - Monica Carnevali
- Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna I, Italy1
| | - Marco Manegatti
- Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna I, Italy1
| | - Carlo Taddei
- Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna I, Italy1
| | - Davide Zannoni
- Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna I, Italy1
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9
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Zannoni D, Prince R, Dutton P, Marrs B. Isolation and characterization of cytochromec2-deficient mutant ofrhodopseudomonas capsulata. FEBS Lett 2001. [DOI: 10.1016/0014-5793(80)80611-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Buggy J, Bauer CE. Cloning and characterization of senC, a gene involved in both aerobic respiration and photosynthesis gene expression in Rhodobacter capsulatus. J Bacteriol 1995; 177:6958-65. [PMID: 7592491 PMCID: PMC177566 DOI: 10.1128/jb.177.23.6958-6965.1995] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The purple nonsulfur photosynthetic eubacterium Rhodobacter capsulatus is a versatile organism that can obtain cellular energy by several means, including the capture of light energy for photosynthesis as well as the use of light-independent respiration, in which molecular oxygen serves as a terminal electron acceptor. In this study, we have identified and characterized a novel gene, senC, mutations in which affect respiration as well as the induction of photosynthesis gene expression. The protein coded by senC exhibits 33% sequence identity to the yeast nucleus-encoded protein SCO1, which is thought to be a mitochondrion-associated cytochrome c oxidase assembly factor. Like yeast SCO1, SenC is required for optimal cytochrome c oxidase activity in aerobically grown R. capsulatus cells. We further show that senC is required for maximal induction from the puf and puh operons, which encode the structural polypeptides of the light-harvesting and reaction center complexes.
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Affiliation(s)
- J Buggy
- Department of Biology, Indiana University, Bloomington 47405, USA
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11
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Hochkoeppler A, Kofod P, Zannoni D. HiPiP oxido-reductase activity in membranes from aerobically grown cells of the facultative phototroph Rhodoferax fermentans. FEBS Lett 1995; 375:197-200. [PMID: 7498498 DOI: 10.1016/0014-5793(95)01188-k] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The role of the periplasmically located, water-soluble, HiPIP (high-potential iron-sulfur protein) in the respiratory chain of the facultative phototroph Rhodoferax fermentans has been examined. The oxidized HiPIP is reduced by succinate-dependent respiration via the bc1 complex, this reaction being inhibited by myxothiazol and/or stigmatellin. The reduced HiPIP can be oxidized by the membrane-bound cytochrome oxidase, this reaction being inhibited by 0.1 mM cyanide. We conclude that aerobically grown Rf. fermentans contains a redox chain in which HiPIP mediates electron transfer between the bc1 complex and the cb-type cytochrome oxidase.
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Hochkoeppler A, Moschettini G, Zannoni D. The electron transport system of the facultative phototroph Rhodoferax fermentans. I. A functional, thermodynamic and spectroscopic study of the respiratory chain of dark- and light-grown cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1995. [DOI: 10.1016/0005-2728(94)00189-c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Hochkoeppler A, Ciurli S, Venturoli G, Zannoni D. The high potential iron-sulfur protein (HiPIP) from Rhodoferax fermentans is competent in photosynthetic electron transfer. FEBS Lett 1995; 357:70-4. [PMID: 8001683 DOI: 10.1016/0014-5793(94)01334-w] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The functional role of the High Potential Iron-sulfur Protein (HiPIP) from the photosynthetic bacterium Rhodoferax fermentans was investigated. We demonstrated that the HiPIP increased the rate of light-induced oxygen reduction mediated by the photosynthetic reaction center (RC); this stimulation reached half-saturation at [HiPIP]/[RC] ca. 15. The capability of the HiPIP in delivering electrons to the reaction center of Rhodoferax fermentans was demonstrated through kinetic spectrophotometry of cytochrome c-556 oxidation in the presence or in the absence of HiPIP. It is concluded that the HiPIP is competent in the photosynthetic electron transfer chain of Rhodoferax fermentans.
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14
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Zannoni D, Daldal F. The role of c-type cytochromes in catalyzing oxidative and photosynthetic electron transport in the dual functional plasmamembrane of facultative phototrophs. Arch Microbiol 1993; 160:413-23. [PMID: 8297207 DOI: 10.1007/bf00245301] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- D Zannoni
- Department of Biology, University of Bologna, Italy
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15
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The role of the membrane bound cytochromes of b- and c-type in the electron transport chain of Rhodobacter capsulatus. Arch Microbiol 1992. [DOI: 10.1007/bf00248683] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Zannoni D, Moore AL. Measurement of the redox state of the ubiquinone pool in Rhodobacter capsulatus membrane fragments. FEBS Lett 1990; 271:123-7. [PMID: 2171997 DOI: 10.1016/0014-5793(90)80387-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The dependence of the respiratory rate on the redox poise of the quinone pool was investigated in wild type and mutant membranes of Rhodobacter capsulatus. A linear relationship has been found between these two parameters only when succinate was oxidized by the bc1 complex. Conversely, a marked nonlinear relationship was observed between the Q-pool reduction level and the respiratory rate when O2 uptake occurred via the alternative oxidase. In addition, it was found that this latter pathway was not engaged until Q-pool reduction level reached approximately 25%. These results are discussed within the framework of a homogeneous pool regulating both photosynthetic and respiratory fluxes.
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Affiliation(s)
- D Zannoni
- Department of Biology, University of Bologna, Italy
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17
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Richardson DJ, McEwan AG, Jackson JB, Ferguson SJ. Electron transport pathways to nitrous oxide in Rhodobacter species. EUROPEAN JOURNAL OF BIOCHEMISTRY 1989; 185:659-69. [PMID: 2556273 DOI: 10.1111/j.1432-1033.1989.tb15163.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
1. Electron transport components involved in nitrous oxide reduction in several strains of Rhodobacter capsulatus and in the denitrifying strain of Rhodobacter sphaeroides (f. sp. denitrificans) have been investigated. Detailed titrations with antimycin A and myxothiazol, inhibitors of the cytochrome bc1 complex, show that part of the electron flow to nitrous oxide passes through this complex. The sensitivity to myxothiazol varies between strains and growth conditions of R. capsulatus; the higher rates of nitrous oxide reduction correlate with the higher sensitivities. Partial inhibition of the nitrous oxide reductase enzyme with azide decreased the sensitivity to myxothiazol of the strains that had the highest nitrous oxide reductase activity. 2. Inhibition of nitrous oxide reduction in cells of R. capsulatus by myxothiazol could be restored under dark conditions by addition of N,N,N',N'-tetramethyl-p-phenylene diamine. The highest activities observed after addition of this electron carrier were found in the strains that had the highest sensitivity to myxothiazol, consistent with the premise that this inhibitor is more effective at the higher flux rates to nitrous oxide. 3. Addition of nitrous oxide to cells of R. capsulatus strain N22DNAR+ under darkness caused oxidation of both b- and c-type cytochromes. The oxidation of b cytochromes was less pronounced in the presence of myxothiazol, consistent with a role for the cytochrome bc1 complex in the electron pathway to nitrous oxide. Ferricyanide, in the absence of myxothiazol, caused a similar extent of oxidation of b cytochromes, but a greater oxidation of c-type, suggesting that there was a pool of c-type cytochrome that was not oxidisable by nitrous oxide. The time course showed that both the b- and c-type cytochromes were oxidised within a few seconds of the addition of nitrous oxide. During the following seconds there was a partial re-reduction of the cytochromes such that after approximately 1 min a lower steady-state of oxidation was attained and this persisted until the nitrous oxide was exhausted. 4. A mutant, MTCBC1, of R. capsulatus that specifically lacked a functional cytochrome bc1 complex reduced nitrous oxide, albeit at 30% of the rate shown by the parent strain MT1131. A reduced minus nitrous-oxide-oxidised difference spectrum for MTCBC1 in the absence of myxothiazol was similar to the corresponding difference spectrum observed for strain N22DNAR+ in the presence of myxothiazol. It is suggested that these difference spectra identify the cytochrome components, including a b-type, involved in a pathway that is alternative to, and independent of, the cytochrome bc1 complex.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- D J Richardson
- School of Biochemistry, University of Birmingham, England
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18
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Ferguson SJ, Jackson J, McEwan AG. Anaerobic respiration in the Rhodospirillaceae: characterisation of pathways and evaluation of roles in redox balancing during photosynthesis. FEMS Microbiol Lett 1987. [DOI: 10.1111/j.1574-6968.1987.tb02455.x] [Citation(s) in RCA: 128] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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19
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Richardson DJ, Kelly DJ, Jackson JB, Ferguson SJ, Alef K. Inhibitory effects of myxothiazol and 2-n-heptyl-4-hydroxyquinoline-N-oxide on the auxiliary electron transport pathways of Rhodobacter capsulatus. Arch Microbiol 1986. [DOI: 10.1007/bf00402344] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Richaud P, Marrs B, Verméglio A. Two modes of interaction between photosynthetic and respiratory electron chains in whole cells of Rhodopseudomonas capsulata. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1986. [DOI: 10.1016/0005-2728(86)90180-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Recovery of the alternative oxidase dependent electron flow by fusion of membrane vesicles from Rhodobacter capsulatus mutant strains. Arch Microbiol 1986. [DOI: 10.1007/bf00409887] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Robertson DE, Davidson E, Prince RC, van den Berg WH, Marrs BL, Dutton PL. Discrete catalytic sites for quinone in the ubiquinol-cytochrome c2 oxidoreductase of Rhodopseudomonas capsulata. Evidence from a mutant defective in ubiquinol oxidation. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(17)36132-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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23
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McEwan A, Cotton N, Ferguson S, Jackson J. The role of auxiliary oxidants in the maintenance of a balanced redox poise for photosynthesis in bacteria. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1985. [DOI: 10.1016/0005-2728(85)90129-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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McEwan AG, Greenfield AJ, Wetzstein HG, Jackson JB, Ferguson SJ. Nitrous oxide reduction by members of the family Rhodospirillaceae and the nitrous oxide reductase of Rhodopseudomonas capsulata. J Bacteriol 1985; 164:823-30. [PMID: 2997133 PMCID: PMC214325 DOI: 10.1128/jb.164.2.823-830.1985] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
After growth in the absence of nitrogenous oxides under anaerobic phototrophic conditions, several strains of Rhodopseudomonas capsulata were shown to possess a nitrous oxide reductase activity. The enzyme responsible for this activity had a periplasmic location and resembled a nitrous oxide reductase purified from Pseudomonas perfectomarinus. Electron flow to nitrous oxide reductase was coupled to generation of a membrane potential and inhibited by rotenone but not antimycin. It is suggested that electron flow to nitrous oxide reductase branches at the level of ubiquinone from the previously characterized electron transfer components of R. capsulata. This pathway of electron transport could include cytochrome c', a component hitherto without a recognized function. R. capsulata grew under dark anaerobic conditions in the presence of malate as carbon source and nitrous oxide as electron acceptor. This confirms that nitrous oxide respiration is linked to ATP synthesis. Phototrophically and anaerobically grown cultures of nondenitrifying strains of Rhodopseudomonas sphaeroides, Rhodopseudomonas palustris, and Rhodospirillum rubrum also possessed nitrous oxide reductase activity.
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McEwan A, Wetzstein H, Ferguson S, Jackson J. Periplasmic location of the terminal reductase in trimethylamine N-oxide and dimethylsulphoxide respiration in the photosynthetic bacterium Rhodopseudomonas capsulata. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1985. [DOI: 10.1016/0005-2728(85)90248-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Zannoni D. Spectral and functional characterization of membrane fragments from the facultative photosynthetic bacterium Rhodopseudomonas blastica. Arch Microbiol 1984. [DOI: 10.1007/bf00409765] [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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McEwan AG, Jackson JB, Ferguson SJ. Rationalization of properties of nitrate reductases in Rhodopseudomonas capsulata. Arch Microbiol 1984. [DOI: 10.1007/bf00410732] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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A functional characterization of the membrane bound iron sulphur centres of Rhodopseudomonas capsulata. Arch Microbiol 1983. [DOI: 10.1007/bf00414475] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Increased activity of respiratory enzymes from photosynthetically grown Rhodopseudomonas capsulata in response to small amounts of oxygen. Arch Microbiol 1983. [DOI: 10.1007/bf00407811] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Rugolo M, Zannoni D. Oxygen-induced inhibition of light-dependent uptake of tetraphenylphosphonium ions as a probe of a direct interaction between photosynthetic and respiratory components in cells of Rhodopseudomonas capsulata. Biochem Biophys Res Commun 1983; 113:155-62. [PMID: 6860334 DOI: 10.1016/0006-291x(83)90445-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Light-generated and oxygen-dependent membrane potentials by heterotrophycally grown cells of Rhodopseudomonas capsulata have been investigated by using a tetraphenylphosphonium ion-selective electrode. The results show that respiratory electron transport affects the magnitude of photogenerated membrane potential while photosynthesis seems to either inhibit or stimulate respiration in coupled or uncoupled cells, respectively. These observations have been considered as evidence that the intracytoplasmic membrane system of R. capsulata contain respiratory and photosynthetic apparatuses which are strictly intermingled.
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Zannoni D. ATP synthesis coupled to light-dependent non-cyclic electron flow in chromatophores of Rhodopseudomonas capsulata. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1982. [DOI: 10.1016/0005-2728(82)90309-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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The kinetics of carotenoid absorption changes in intact cells of photosynthetic bacteria. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1982. [DOI: 10.1016/0005-2728(82)90265-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zannoni D, Marrs B. Redox chain and energy transduction in chromatophores from Rhodopseudomonas capsulata cells grown anaerobically in the dark on glucose and dimethyl sulfoxide. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1981. [DOI: 10.1016/0005-2728(81)90214-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bittan R, Hochman A, Yagil E, Carmeli C. Inhibitor sensitivity of light-dependent oxygen reduction in chromatophores from wild-type and an oxidase-deficient mutant of Rhodopseudomonas capsulata. Arch Biochem Biophys 1981; 209:276-83. [PMID: 7283441 DOI: 10.1016/0003-9861(81)90281-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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