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Stuart J. Ferguson, J. Barry Jackson, Alastair G. McEwan; Anaerobic respiration in the Rhodospirillaceae: characterisation of pathways and evaluation of roles in redox balancing during photosynthesis, FEMS Microbiology Reviews, Volume 3, Issue 2, 1 June 1987, Pages 117–143, https://doi.org/10.1111/j.1574-6968.1987.tb02455.x
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Abstract
Recent discoveries relating to pathways of anaerobic electron transport in the Rhodospirillaceae are reviewed. The main emphasis is on the organism Rhodobacter capsulatus** but comparisons are made with Rhodobacter sphaeroides** f. sp. denitrificans and Rhodopseudomonas palustris. The known electron acceptors for anaerobic respiration in Rhodobacter capsulatus are trimethylamine-N-oxide (TMAO), dimethyl sulphoxide (DMSO), nitrate and nitrous oxide. In each case respiration generates a proton electrochemical gradient and in some cases can support growth on non-fermentable carbon sources. However, the principal objective of this review is to discuss the possibility that, apart from a role in energy conservation, anaerobic respiration in the photosynthetic bacteria may have a special function in maintaining redox balance during photosynthetic metabolism. Thus the electron acceptors mentioned above may serve as auxiliary oxidants: (a) to maintain an optimal redox poise of the photosynthetic electron transport chain; (b) to provide a sink for electrons during phototrophic growth on highly reduced carbon substrates.
Molecular properties of the nitrate reductase, nitrous oxide reductase and a single enzyme responsible for reduction of TMAO and DMSO are discussed. These enzymes are all located in the periplasm. Electrons destined for all three enzymes can originate from the rotenone-sensitive NADH dehydrogenase but do not proceed through the antimycin- and myxothiazol-sensitive cytochrome b/c1 complex. It is likely, therefor, that the pathways of anaerobic respiration overlap with the cyclic photosynthetic electron transport chain only at the level of the ubiquinone pool. Redox components which might be involved in the terminal branches of anaerobic respiration are discussed.
Abbreviations
- Δp
protonmotive force (proton electrochemical gradient in units of mv)
- Δψ
cytoplasmic membrane potential
- DCPIP
2,6-dichlorophenolindophenol
- DMS
dimethylsulphide
- DMSO
dimethylsulphoxide
- FMN
flavinmononucleotide
- HQNO
2-n-heptyl-4-hydroxyquinoline-N-oxide
- PMS
phenazine methosulphate
- TMA
trimethylamine
- TMAO
trimethylamine-N-oxide
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.© 1987 Federation of European Microbiological Societies
Topic:
- nitrate
- respiration
- metabolism
- carbon
- cytochromes b
- dimethyl sulfoxide
- electron transport
- cytochrome c reductase
- nitrate reductases
- nitrous oxide
- oxidants
- oxidation-reduction
- oxides
- oxidoreductase
- periplasm
- photosynthesis
- protons
- rhodobacter capsulatus
- rhodobacter sphaeroides
- rhodopseudomonas
- rhodospirillaceae
- rotenone
- ubiquinone
- bacteria
- enzymes
- thermodynamic energy conservation
- trimethyloxamine
- trimethylamine
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