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Insights into the genomes of archaea mediating the anaerobic oxidation of methane

MPG-Autoren

Meyerdierks,  Anke
Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50397

Kube,  Michael
High Throughput Technologies, Max Planck Institute for Molecular Genetics, Max Planck Society;

Lombardot,  Thierry
Max Planck Society;

Knittel,  Katrin
Max Planck Society;

Bauer,  Margarete
Max Planck Society;

Gloeckner,  Frank Oliver
Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50488

Reinhardt,  Richard
High Throughput Technologies, Max Planck Institute for Molecular Genetics, Max Planck Society;

Amann,  Rudolf
Max Planck Society;

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Zitation

Meyerdierks, A., Kube, M., Lombardot, T., Knittel, K., Bauer, M., Gloeckner, F. O., et al. (2005). Insights into the genomes of archaea mediating the anaerobic oxidation of methane. Environmental Microbiology, 7(12), 1937-1951. doi:10.1111/j.1462-2920.2005.00844.x.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-8546-9
Zusammenfassung
The anaerobic oxidation of methane is a globally significant process which is mediated by consortia of yet uncultivated methanotrophic archaea (ANME) and sulfate-reducing bacteria. In order to gain deeper insights into genome characteristics of the different ANME groups, large-insert genomic libraries were constructed using DNA extracted from a methanotrophic microbial mat growing in the anoxic part of the Black Sea, and from sediments above gas hydrates at the Hydrate Ridge off the coast of Oregon. Analysis of these fosmid libraries with respect to archaeal 16S rRNA gene diversity revealed a single ANME-1b ribotype for the Black Sea libraries, whereas the sequences derived from the Hydrate Ridge library phylogenetically affiliated with the ANME-2a, ANME-2c and ANME-3 group. Genome walking for ANME-1b resulted in a contiguous 155 kb composite genome fragment. The comparison of a set of four genomic fragments belonging to the different ANME groups revealed differences in the rRNA operon structure and the average G+C content, with the ANME-2c contig showing the highest divergence within the set. A detailed analysis of the ANME contigs with respect to genes putatively involved in the anaerobic oxidation of methane led to the identification of: (i) a putative N5,N10-methenyltetrahydromethanopterin cyclohydrolase gene, (ii) a gene cluster supposedly encoding a novel type of heterodisulfide reductase/dehydrogenase complex and (iii) a gene cluster putatively encoding a new type of CO dehydrogenase/acetyl-CoA synthase enzyme complex.