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  • 1
    Electronic Resource
    Electronic Resource
    Isolation and characterization of Methanoplanus endosymbiosus sp. nov., an endosymbiont of the marine sapropelic ciliate Metopus contortus quennerstedt (1986)
    Springer
    Archives of microbiology 144 (1986), S. 367-374 
    Details
    ISSN: 1432-072X
    Keywords: Ciliate culture ; Endosymbiosis ; Interspecies hydrogen transfer ; Hydrogenosome ; Methanogenic bacteria ; Methanoplanus endosymbiosus sp. nov. ; Metopus contortus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Epifluorescence microscopy revealed the presence of a methanogenic bacterium as an endosymbiont in the sapropelic marine ciliate Metopus contortus. The in situ methanogenic activity of the symbiont could be demonstrated. The isolated endosymbiont was an irregular, disc-shaped bacterium with a diameter of 1.6–3.4 μm. It had a generation time of 7 or 12 hours on growth on H2/CO2 or formate, respectively. The temperature range for growth was between 16 and 36°C with an optimum at 32°C. The optimal pH range for growth was 6.8 to 7.3. Salts, with an optimum concentration of 0.25 M, and tungsten were required for growth. The mol% G+C was 38.7%. The cell envelope consisted of proteins and a glycoprotein with an apparent molecular weight of 110,000. Morphology, antigenic relationship and the G+C content established the isolate MC1 as a new species of the genus Methanoplanus, and the name Methanoplanus endosymbiosus is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409886
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  • 2
    Electronic Resource
    Electronic Resource
    Interconversion of F430 derivatives of methanogenic bacteria (1988)
    Springer
    Antonie van Leeuwenhoek 54 (1988), S. 207-220 
    Details
    ISSN: 1572-9699
    Keywords: Factor F430, Ni(II) tetrapyrrole ; methylcoenzyme M reduction ; methanogenesis ; Methanosarcina barkeri ; Methanobacterium thermoautotrophicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract F430 is the prosthetic group of the methylcoenzyme M reductase of methanogenic bacteria. The compound isolated from Methanosarcina barkeri appears to be identical to the one obtained from the only distinctly related Methanobacterium thermoautotrophicum. F430 is thermolabile and in the presence of acetonitrile or C10 in4 sup- two epimerization products are obtained upon heating; in the absence of these compounds F430 is oxidized to 12, 13-didehydro-F430. The latter is stereoselectively reduced under H2 atmosphere to F430 by cell-free extracts of M. barkeri or M. thermoautotrophicum. H2 may be replaced by the reduced methanogenic electron carrier coenzyme F420.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443579
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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