Thermomicrobium roseum (ATCC 27502) is the sole representative of a phylogenetically distinct branch of the eubacteria. It is an obligately thermophilic organism originally isolated from the effluent of a hot spring in Yellowstone National Park, WY (Jackson et al., 1973). T. roseum has been grouped with the green nonsulfur (GNS) bacteria based on ribosomal RNA sequence comparisons (Oyaizu et al., 1987). Herpetosiphon and Chloroflexus,the other representatives in this branch (Fig. 1), are markedly different phenotypically from T. roseum. Although the GNS bacteria share some common ribosomal characters they are the progeny of a deep phylogenetic divergence (Gibson et al., 1985); Herpetosiphon is a mesophile and more rapidly evolving than either Chloroflexus or Thermomicrobium. The deepest branching in eubacterial evolution is predominantly represented by thermophiles (Fig. 1), and these organisms evolved more slowly than the mesophiles. They have consequently retained more of their ancestral character (Achenbach-Richter et al., 1987).
KeywordsDiaminopimelic Acid Muramic Acid Cyanidium Caldarium Purify Cell Wall Geyser Basin
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- Jackson, T. J., R. E Ramaley and W. G. Meinschein. 1973. Thermomicrobium, a new genus of extremely thermophilic bacteria. Int. J. Syst. Bacteriol. 23: 28–36.Google Scholar
- Merkel, G. J., D. R. Durham, and J. J. Perry. 1980. The atypical cell wall composition of Thermomicrobium roseum, Can. J. Microbiol. 26: 556–559.Google Scholar
- Perry, J. J. 1984. Genus Thermomicrobium Jackson, Ramaley and Meinschein 1973, p. 338–339. In: Krieg, N. R., and J. G. Holt (ed.), Bergey’s manual of systematic bacteriology, vol. 1. Williams and Wilkins, Baltimore.Google Scholar
- Phillips, W. E., and J. J. Perry. 1976. Thermomicrobium fosteri sp. nov., a hydrocarbon-utilizing obligate thermophile. Int. J. System. Bacteriol. 26: 220–225.Google Scholar
- Pond, J. L., and T. A. Langworthy. 1987. Effect of growth temperature on the long-chain diols and fatty acids of Thermomicrobium roseum. J. Bacteriol. 169: 13281330.Google Scholar
- Zarilla, K. A., and J. J. Perry. 1987. Bacillus thermoleovorans, sp. nov., a species of obligately thermophilic hydrocarbon utilizing endosporeforming bacteria. System. Appl. Microbiol. 9: 258–264.Google Scholar