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  • 1
    Electronic Resource
    Electronic Resource
    Occurrence of corrinoid-containing membrane proteins in anaerobic bacteria (1987)
    Springer
    Archives of microbiology 148 (1987), S. 52-56 
    Details
    ISSN: 1432-072X
    Keywords: Methanogenic bacteria ; Sulfate-reducing bacteria ; Acetogenic bacteria ; Corrinoid ; Methane formation ; Cobalt ; Membrane cobamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Methanobacterium thermoautotrophicum a corrinoid-carrying membrane protein complex has been found, to which a tentative role in methane formation has been ascribed. To test this hypothesis representatives from different orders of methanogenic bacteria were examined for membrane-bound cobamides. These species differed in cell carbon precursor, in methane precursor, in occurrence of cytochromes and of the enzyme CO dehydrogenase, and in the systematic position (Methanobacteriales, Methanomicrobiales). All methanogenic bacteria contained cobamides in the membranes in amounts of about 60 nmol/g cell dry weight, in addition to different amounts of cobamides in the soluble cell fraction. The only central metabolic reaction obviously common to all of these methanogens was methyl coenzyme M reduction to CH4. It is concluded that the membrane corrinoid participates in this energy-conserving reaction. Sulfate-reducing and acetogenic bacteria were included in this survey. They contained different amounts of cobamides in the soluble cell fraction but not in the membrane, a possible exception being Acetobacterium woodii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429647
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon isotope fractionation by Methanobacterium thermoautotrophicum (1979)
    Springer
    Archives of microbiology 120 (1979), S. 135-139 
    Details
    ISSN: 1432-072X
    Keywords: Carbon isotope discrimination ; Autotrophic CO2 fixation ; Methane formation ; Methanobacterium thermoautotrophicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fractionation of carbon isotopes by Methanobacterium thermoautotrophicum was studied during growth of the bacterium on H2 plus CO2 as sole carbon and energy sources. A 80% H2/20% CO2 gas mixture was continuously bubbled through the culture. At high gassing rates, in the absence of a “closed system effect”, cells and methane were found to be depleted in 13C relative to CO2 in the gas mixture by 2.4% and 3.4%, respectively. At low gassing rates, when more than 90% of the CO2 was converted to methane, the cells were enriched in 13C by 1.3% and methane was depleted in 13C by 0.5%; residual CO2 was enriched in 13C by 3.4%. The magnitude of isotope fractionation suggests that CO2 rather than bicarbonate is the active species of CO2 mainly utilized in both CO2 assimilation and CO2 reduction to methane. The apparent positive 13C-discrimination in cell carbon synthesis, which was observed at low gassing rates, indicates that most of the CO2 assimilated into cell material is not incorporated via reactions involved in CO2 reduction to methane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409099
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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