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  • 1
    Electronic Resource
    Electronic Resource
    Nickel and iron EXAFS of carbon monoxide dehydrogenase from Clostridium thermoaceticum strain DSM (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 5581-5582 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00224a058
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  • 2
    Electronic Resource
    Electronic Resource
    Sodium dependent acetate formation from CO2 in Peptostreptococcus productus (strain Marburg) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 57 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb14091.x
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  • 3
    Electronic Resource
    Electronic Resource
    Carbon monoxide fixation into the carboxyl group of acetate during growth of Acetobacterium woodii on H2 and CO2 (1983)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 17 (1983), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1983.tb00423.x
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  • 4
    Electronic Resource
    Electronic Resource
    The fdh operon of Sulfurospirillum multivorans (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 237 (2004), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The complete single copy fdh operon (∼5.7 kb) encoding the formate dehydrogenase subunits of the gram negative, reductively dehalogenating anaerobe Sulfurospirillum multivorans was sequenced and analyzed. The gene fdhA encoding the catalytically active periplasmic subunit is part of an operon (fdhEABCD) containing additional structural genes. The genes fdhEABCD were cotranscribed as indicated by RT-PCR and primer extension experiments. Two mRNAs for fdhEABCD and fdhABCD were either transcribed independently from two transcription start sites upstream of fdhE and fdhA or might result from posttranscriptional processing of the full-length fdhEABCD mRNA. The operon shows a high degree of similarity to the fdh operons of Campylobacter jejuni and Wolinella succinogenes in terms of architecture and putative cofactor binding motifs of the gene products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.2004.tb09701.x
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  • 5
    Electronic Resource
    Electronic Resource
    Reductive dechlorination in the energy metabolism of anaerobic bacteria (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 22 (1998), S. 0 
    Details
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Within the last few decades, several anaerobic bacteria have been isolated which are able to reductively dechlorinate chlorinated aliphatic and aromatic compounds at catabolic rates. For some of these bacteria, it has been shown that the reductive dechlorination is coupled to energy conservation, a process designated as ‘dehalorespiration’. Somewhat simple respiratory chains seem to be involved that utilize the free energy that could be gained from the exergonic dechlorination reaction quite inefficiently. With one exception, all reductive dehalogenases isolated to date contain a corrinoid and iron–sulfur clusters as cofactors. During the course of the catalytic reaction cycle, the cobalt of the corrinoid is subjected to a change in its redox state. Hence, reductive dechlorination represents a new type of biochemical reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6976.1998.tb00377.x
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon monoxide metabolism in cell suspensions of Peptostreptococcus productus strain Marburg (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 43 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Peptostreptococcus productus strain Marburg is able to grow on CO as the sole energy source and converts this substrate to acetate and CO2 according to the following equation: 4 CO + 2 H2O → 1 acetate−+ 1 H++ 2 CO2 In cell suspensions of the organism the apparent Km value for CO conversion to acetate was about 270 μM (∼ 25% in the gas phase at 140 kPa). Cells incubated in the presence of 14CO and unlabelled CO2 incorporated CO specifically into the carboxyl group of acetate like other acetogenic bacteria tested. However, in contrast to experiments performed with other acetogens, 100% of the carboxyl group formed was derived from CO rather than from CO2 indicating that ‘free’ CO rather than a bound carbonyl formed from CO2 may be the precursor for the synthesis of the carboxyl group of acetate in this organism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02174.x
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  • 7
    Electronic Resource
    Electronic Resource
    CO2 reduction to acetate in anaerobic bacteria (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 87 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The reduction of 2 CO2 to acetate is catalyzed in the energy metabolism of homoacetogenic bacteria, which couple acetate formation to the synthesis of ATP. The carboxyl group of acetate is formed from CO2 via reduction to a bound carbonyl ([CO]), a redution that requires the input of methaolic energy when hydrogen is used as the electron donor. The methyl group of acetate is formed via formate and tetrahydrofolate bound C1 intermediates including methyl tetrahydrofolate as the intermediates. The methyl group is the ‘condensed’ with the carbonyl and CoA to acetyl-CoA, which is converted to acetate in the energy metabolism or to cell carbon in the anabolism of the bacteria. The mechanism of ATP synthesis coupled to CO2 reduction to acetate is still unclear. The only reaction sufficiently exergonic is the reduction of methylene tetrahydrofolate to methyl tetrahydrofolate. Indirect evidence was presented that this reaction in homoacetogens might be coupled to the electrogenic transport of sodium across the cytoplasmic membrane. The sodium gradient formed via methylene-THF reduction could be transformed into a proton gradient via a sodium/proton antiporter. ATP would then be synthesized by a proton translocating ATP synthase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb04942.x
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  • 8
    Electronic Resource
    Electronic Resource
    Sodium dependent acetate formation from CO2 in Peptostreptococcus productus (strain Marburg) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 57 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Washed cells of Peptostreptococcus productus (strain Marburg), which were incubated in the presence of CO/CO2/N2 (50%/ 17%/ 33%; 200 kPa) catalyzed the synthesis of acetate from carbon monoxide. The rate of acetate formation from CO was stimulated more than threefold by the addition of sodium (10 mM); potassium did not effect acetate synthesis. The degree of stimulation was dependent on the sodium concentration; the dependence followed simple Michaelis-Menten kinetics. The apparent Km for sodium was determined to be about 2 mmol/1. Sodium also stimulated acetate synthesis from H2 plus CO2. In the absence of added sodium the formation of formate as an intermediate in methyl group synthesis was stimulated. It is suggested that the sodium dependent reaction(s) is one (or more) of the reactions involved in methyl group synthesis from CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03363.x
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  • 9
    Electronic Resource
    Electronic Resource
    The attachment of bacterial cells to surfaces under anaerobic conditions (1993)
    Springer
    Applied microbiology and biotechnology 38 (1993), S. 667-673 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The cell fixation of Pseudomonas aeruginosa, Citrobacter amalonaticus, and Methanosarcina barkeri to lipid-free glass slides was investigated under anaerobic conditions using cell number, protein content, and ATP level as the biomass parameters. Energy substrates stimulated the attachment of P. aeruginosa and C. amalonaticus significantly as compared to the fixation behaviour in basal medium without substrates. The fixation exhibited charateristic kinetics of attachment and detachment of the cells. Cells of M. barkeri obtained from pure cultures did not adhere at all. In mixed cultures with C. amalonaticus, significant fixation of M. barkeri cells was observed. Light micrographs gave rise to the assumption that M. barkeri was “incorporated” into already existing biofilms. This mechanism is supposed to be important for retaining methanogenic biomass in anaerobic biofilms. The results could help to reduce the start-up periods of biofilm reactors and to enhance methanogenic activities in this environment. This assumption was supported by experiments performed with methanogenic mixed cultures fixed to ceramic particles in biofilm reactors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182808
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  • 10
    Electronic Resource
    Electronic Resource
    Incorporation of 8 succinate per mol nickel into factors F430 by Methanobacterium thermoautotrophicum (1980)
    Springer
    Archives of microbiology 128 (1980), S. 256-262 
    Details
    ISSN: 1432-072X
    Keywords: Factors F430 ; Methanobacterium thermoautotrophicum ; Nickel ; Tetrapyrrole biosynthesis ; Succinate incorporation ; Methanobacterium bryantii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Factors F430 from methanogenic bacteria have recently been shown to contain nickel and it has been speculated that they may have a nickel tetrapyrrole structure. This assumption was tested by determining whether succinate is incorporated by growing Methanobacterium thermoautotrophicum into three factors F430. Succinate is assimilated by Methanobacterium thermoautotrophicum into the amino acids glutamate, arginine and proline and into tetrapyrroles rather than other cell components. It was found that per mol nickel 8–9 mol of succinate were incorporated into the three factors F430 which is the amount predicted for a tetrapyrrole structure. Since the three factors F430 only contained significant amounts of glutamate rather than arginine or proline, the incorporation data suggest that factors F430 are nickel tetrapyrrole compounds. Spectral properties of the three factors F430, apparent molecular weights, and the absence of phosphor in these compounds are also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406169
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