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Transfer of the Type Species of the Genus Themobacteroides to the Genus Themoanaerobacter As Themoanaerobacter Acetoethylicus (Ben-Bassat and Zeikus 1981) Comb

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Transfer of the Type Species of the Genus Themobacteroides to the Genus Themoanaerobacter As Themoanaerobacter Acetoethylicus (Ben-Bassat and Zeikus 1981) Comb INTERNATIONAL JOURNAL OF SYSTEMATICBACTERIOLOGY, Oct. 1993, p. 857-859 Vol. 43, No. 4 0020-7713/93/040857-03$02.00/0 Copyright 0 1993, International Union of Microbiological Societies Transfer of the Type Species of the Genus Themobacteroides to the Genus Themoanaerobacter as Themoanaerobacter acetoethylicus (Ben-Bassat and Zeikus 1981) comb. nov., Description of Coprothemobacter gen. nov., and Reclassification of Themobacteroides proteolyticus as Coprothennobacter proteolyticus (Ollivier et al. 1985) comb. nov. FRED A. RAINEY AND ERKO STACKEBRANDT* DSM-Deutsche Sammlung von Mikroolganisrnen und Zellkulturen, Mascheroder Weg lb, 38124 Braunschweig, Germany Phylogenetic and phenotypic evidence demonstrates the taxonomic heterogeneity of the genus Thennobac- teroides and indicates a close relationship between Thennobacteroides acetoethylicus and members of the genus Thennoanaerobacter. Since T. acetoethylicus is the type species of Thennobacteroides, its removal invalidates the genus. As a consequence, the remaining species Thennobacteroides proteolyticus is proposed as the type species of the new genus Coprothennobacter gen. nov., as Coprothennobacter proteolyticus comb. nov. Recent phylogenetic studies (8, 9) of anaerobic thermo- hybridization studies with all members of Thermoanaero- philic species demonstrated that the majority of strains fall bacter (6, 10) despite the fact that, like Thermoanaerobacter within the phylogenetic confines of the Clostridium-Bacillus species, Thermobacteroides acetoethylicus is an anaerobic, subphylum of gram-positive bacteria. In contrast to the thermophilic, glycolytic bacterium capable of growth above phylog enet ically coherent genera Thermoana erobac ter (6) 70°C that has been isolated from geothermal environments. and Thermoanaerobacterium (6), members of Thermobac- The reclassifications of the recent study of Lee et al. (6) teroides (1,7) belonged to phylogenetically very diverse taxa increased the numbers of species of Thermoanaerobacter to (8). While the type species Thermobacteroides acetoethyli- now include Thermoanaerobacter ethanolicus, Thermo- cus (1) was closely related to members of Thermoanaero- anaerobacter brockii, Thermoanaerobacterfinnii, and Ther- bacter (9), Thermobacteroides proteolyticus represented a moanaerobacter thermohydrosulfuricus. Thermobacteroi- deep root adjacent to members of the order Thermotogales, des acetoethylicus seems to have been overlooked in recent showing only 81.9% sequence similarity with Thermobac- studies, possibly because of the differences previously re- teroides acetoethylicus over the stretch of about 1,200 ported to exist between Thermobacteroides acetoethylicus analyzed nucleotides (8). On the basis of these phylogenetic and Thermoanaerobacterbrockii (1) in motility, Gram stain- findings, supported by phenotypic characteristics, we put ing, fermentation end products, cell wall structure, and forward the evidence for the reclassification of the species (detected later) spore formation (2). These organisms share investigated. The genus Thermobacteroides contains three as one of the main features used to define members of validly described species, Thermobacteroides acetoethyli- Thermoanaerobacter the reduction of thiosulfate, but not cus (1, 9), Thermobacteroides proteolyticus (7), and Ther- sulfate, to sulfide (1, 5). Other common features (for which mobacteroides leptospartum (4, 12). Attempts to obtain data are available) are rod-shaped morphology of organisms Thermobacteroides leptosparhrm IAM 13499 from the Insti- from the logarithmic phase of growth, DNA base composi- tute of Applied Microbiology, University of Tokyo, Tokyo, tion of 31 to 37 mol% (not considering the high values of 37 Japan, failed. This article is composed of two parts: (i) the transfer of the to 39 mol% determined for Thermoanaerobacterethanolicus type species of Thermobacteroides, Thermobacteroides ac- by the buoyant density method), high G+C composition (56 etoethylicus, to the genus Thermoanaerobacter, with the to 59 mol%) of genes coding for rRNA, lack of catalase and consequence of invalidating the genus Thermobacteroides, cytochromes, maximum growth temperature above 75"C, and (ii) the description of the genus Coprothermobacter and optimal growth temperature above 65"C, and a pH for the assignment of Thermobacteroides proteolyticus as the growth between 5.5 and 8.5 (1,5,10,13). In addition, Wiegel type species Coprothermobacterproteolyticus . (14) pointed out that the only difference between Thermo- Thennoanaerobacter acetoethylicus comb. nov. Genera anaerobacter ethanolicus and Thermobacteroides acetoeth- Thermobacteroides and Thermoanaerobacter were both de- ylicus is the inability of the latter species to form more than scribed in 1981 (1, 13), and the type strain of each was not 1.5 mol of ethanol per mol of glucose utilized. available to the authors of the article on the other genus for Description of Thennoanaerobacter acetoethylicus (Ben-Bas- direct comparison. It was not until recently that the close sat and Zeikus) comb. nov. The description of the species phylogenetic relatedness of the type strains of the type has not been emended since its effective published descrip- species of these two genera was demonstrated (9). Thermo- tion (1, 3). The transfer of the species to the genus Thermo- bacteroides acetoethylicus was never included in DNA anaerobacter does not change the description of this genus. The type strain of Thennoanaerobacter acetoethylicus is HTB2/W (ATCC 33265). * Corresponding author. Description of the genus Coprothennobacter. The transfer of 857 858 NOTES INT. J. SYST.BACTERIOL. TABLE 1. Characteristics differentiating C. proteolyticus from phylogenetically related and phenotypically similar taxa Optimum Maximum Fermentation end So metabolism Bacterium(-a) products? Coprothermobacterproteo- Rods; pleomorph - 45 63 75 A, CO,, H, NR~ lytiCU ,Aquifexpyrophilus Rods, aggregates + 40 85 95 -c H,S from sulfur Thermotoga spp . Rods, toga VaP 4046 70-80 90 L, A, COz, H, H,S from sulfur Thermosipho spp. Rods, toga, chains - 30 75 77 L, A, CO,, H, H2S from sulfur Fervidobacterium spp. Rods, spheroids Var 3440 65 80 L, A, E, b, v, CO,, H, H2S from sulfur Thermoanaerobacter spp. Rods Var 31-37 64-69 75-78 A, E, L, CO,, H, H,S from thiosulfate Thermoanaerobacteriumspp. Rods + 33-36 60 68-75 A, E, L, CO,, H, So from thiosulfate A, acetate; L, lactate; E, ethanol; b, n-butyrate; v, n-valerate. NR, not reported. -, A. mrophilus is chemolithoautotrophic. Var, variable. the type species of the genus Thermobacteroides to the We thank Thomas 0. MacAdoo for his help in nomenclatural genus Thennoanaerobacter invalidates the genus Thermo- matters. bacteroides (rule 37a [l])(11). In order to find a place for the orphan Thermobacteroides proteolyticus, two options are REFERENCES available. One could revive the genus Thermobacteroides, 1. Ben-Bassat, A., and J. G. Zeikus. 1981. Thermobacteroides or alternatively, a new genus could be proposed. The revival acetoethylicus gen. nov. sp. nov., a new chemoorganotrophic, of Themobacteroides, in our opinion, is unwise since the anaerobic, thermophilic bacterium. Arch. Microbiol. 128365- -bacteroides part of the name implies a relationship to the 370. 2. Cook, G. M., P. H. Janssen, and H. W. Morgan. 1991. Endo- genus Bacteroides. As pointed out previously (8), Thenno- spore formation by Themzoanaerobium brockii HTD4. Syst . bacteroides proteolyticus is not a member of the Bacte- Appl. Microbiol. 14240-244. roides-Cytophaga phylum but constitutes a deep-rooting 3. International Journal of Systematic Bacteriology. 1983. Valida- phylum of the domain Bacteria. The origin of this species tion of the publication of new names and new combinations from a thermophilic digester fed with cattle manure and previously effectively published outside the IJSB. List no. 11. tannery waste led us to propose the genus name Coprother- Int. J. Syst. Bacteriol. 33:672-674. rnobacter. This name appears to be appropriate, since the 4. International Journal of Systematic Bacteriology. 1989. Valida- currently unavailable species Thermobacteroides leptospar- tion of the publication of new names and new combinations (12), which resembles Thermobacteroidesproteolyticus previously effectively published outside the IJSB. List no. 28. turn Int. J. Syst. Bacteriol. 39:93-94. in phenotypic properties and the base composition of DNA 5. Jain, M. K., and J. G. Zeikus. 1992. The genera Thermoanaer- (Table l),was also isolated from cattle manure. As long as obacter, Thermoanaerobium, and other thermoanaerobic sac- Thennobacteroides leptospartum is unavailable, its phylo- charolytic bacteria of uncertain taxonomic affiliation, p. 1901- genetic position cannot be determined, and hence, this 1913. In A. Ballows, H. G. Truper, M. Dworkin, W. Harder, species cannot be reclassified at this time. and K.-H. Schleifer (ed.), The prokaryotes, 2nd ed. Springer- C. proteolyticus is proposed as the type species because Verlag, New York. its description (7) predates that of Thermobacteroides 6. Lee, Y. E., M. K. Jain, C. Lee, S. E. Lowe, and J. G. Zeikus. leptosparturn (4, 12). Members of the genus Coprothenno- 1993. Taxonomic distinction of saccharolytic thermophilic bacter can be distinguished from other anaerobic, thermo- anaerobes: description of Thermoanaerobacterium xylano- iyticum gen. nov., sp. nov., and Thermoanaerobacterium philic bacteria by a combination of characters (Table 1). saccharolyticum gen. nov., sp. nov.; reclassification of Ther- Description
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