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  • 1
    Electronic Resource
    Electronic Resource
    Novel 16S rRNA gene sequences retrieved from highly saline brine sediments of Kebrit Deep, Red Sea (1999)
    Springer
    Archives of microbiology 172 (1999), S. 213-218 
    Details
    ISSN: 1432-072X
    Keywords: Key words 16S rRNA gene sequences ; Phylogeny ; Bacteria ; Archaea ; Brines ; Kebrit Deep ; Red Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this study, we report on first 16S rRNA gene sequences from highly saline brine sediments taken at a depth of 1,515 m in the Kebrit Deep, northern Red Sea. Microbial DNA extracted directly from the sediments was subjected to PCR amplification with primers specific for bacterial and archaeal 16S rRNA gene sequences. The PCR products were cloned, and a total of 11 (6 bacterial and 5 archaeal) clone types were determined by restriction endonuclease digestion. Phylogenetic analysis revealed that most of the cloned sequences were unique, showing no close association with sequences of cultivated organisms or sequences derived from environmental samples. The bacterial clone sequences form a novel phylogenetic lineage (KB1 group) that branches between the Aquificales and the Thermotogales. The archaeal clone sequences group within the Euryarchaeota. Some of the sequences cluster with the group II and group III uncultivated archaea sequence clones, while two clone groups form separate branches. Our results suggest that hitherto unknown archaea and bacteria may thrive in highly saline brines of the Red Sea under extreme environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050762
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  • 2
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships ofBacteria based on comparative sequence analysis of elongation factor Tu and ATP-synthase β-subunit genes (1993)
    Springer
    Antonie van Leeuwenhoek 64 (1993), S. 285-305 
    Details
    ISSN: 1572-9699
    Keywords: ATP synthase β-subunit ; Bacteria ; elongation factor Tu ; phylogeny ; sequence analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comparative sequence analyses were performed on 14 genes encoding bacterial elongation factors EF-Tu and 7 genes encoding the β-subunit of bacterial F1F0 type ATP-synthases. The corresponding predicted amino acid sequences were compared with published primary structures of homologous molecules. Phylogenetic trees were reconstructed from both data sets of aligned protein sequences and from an equivalent selection of 16S rRNA sequences by applying distance matrix and maximum parsimony methods. The EF-Tu data were in very good agreement with the rRNA data, although the resolution within the EF-Tu tree was reduced at certain phylogenetic levels. The resolution power of the ATPase β-subunit sequence data were more reduced than those of the EF-Tu data. In comparison with the 16S rRNA tree there are minor differences in the order of adjacent branchings within the ATPase β-subunit tree.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00873088
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