Archives of Microbiology

, Volume 192, Issue 6, pp 485–491 | Cite as

Caldimonas hydrothermale sp. nov., a novel thermophilic bacterium isolated from roman hot bath in south Tunisia

  • Hanene Bouraoui
  • Imen Boukari
  • Jean Pierre Touzel
  • Michael O’Donohue
  • Mohamed Manai
Original Paper


A polyphasic approach was used to characterize a bacterium, HAN-85T, isolated from thermal water in natural thermal spring at Tozeur, an oasis in southwest Tunisia. The novel isolate was thermophilic, strictly aerobic and amylolytic bacterium, which stained Gram negative. Cells were short rods motile by means of a single polar flagellum. Their optimum temperature and pH required for growth were 55°C and pH 7, respectively. Comparative 16S rRNA gene sequence analyses showed that strain HAN-85T belonged to the genus Caldimonas, with highest sequence similarity to the type strains Caldimonas manganoxidans and Caldimonas taiwanensis. DNA–DNA hybridization measurements revealed low DNA relatedness (35.2–44.5%) between the novel isolate and its closest relative, C. manganoxidans. The major cellular fatty acid components were 16:0, 17:0 cyclo and summed feature 3. The DNA G+C content was 68.3 mol%. Taken together, the results of DNA–DNA hybridization, fatty acids profile, physiological tests and biochemical analyses have allowed the genotypic and phenotypic differentiation of the isolate from currently recognized Caldimonas species. Therefore, we suggest that this isolate is a novel species within the genus Caldimonas and propose that it should be named Caldimonas hydrothermale sp. nov. The type strain is HAN-85T (=DSM 18497T =LMG 23755T). The Gen Bank/Embl/DDBJ accession number for the 16S rRNA gene sequence of strain DSM 18497T is AM283038.


Caldimonas Thermophile Amylolytic bacterium Hammam Tunisian thermal spring 



This work was supported by the French-Tunisian Mixed Committee of University Cooperation (CMCU Projects).

Supplementary material

203_2010_576_MOESM1_ESM.doc (11.3 mb)
Supplementary material 1 (DOC 11,540 kb)


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Hanene Bouraoui
    • 1
  • Imen Boukari
    • 2
  • Jean Pierre Touzel
    • 2
  • Michael O’Donohue
    • 3
    • 4
    • 5
  • Mohamed Manai
    • 1
  1. 1.Laboratoire de Biochimie et Biologie Moléculaire, Faculté des Sciences de TunisCampus Universitaire El-ManarTunisTunisie
  2. 2.INRA, UMR FARE INRA-URCA 614, 8, rue Gabriel-VoisinReims Cedex 02France
  3. 3.Université de Toulouse, INSA, UPS, INP, LISBPToulouseFrance
  4. 4.INRA, UMR792 Ingénierie des Systèmes Biologiques et des ProcédésToulouseFrance
  5. 5.CNRS, UMR5504ToulouseFrance

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