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1 Department of Botany and Microbiology, and Institute of Energy and the Environment, University of Oklahoma, Norman, OK 73019, USA
2 The Institute of Life Sciences and the Moshe Shilo Minerva Center for Marine Biogeochemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
3 Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, Seville, Spain
Correspondence
Mostafa S. Elshahed
mostafa{at}ou.edu
A pleomorphic, extremely halophilic archaeon (strain M6T) was isolated from a sulfide- and sulfur-rich spring in south-western Oklahoma (USA). It formed small (0·8–1·0 mm), salmon pink, elevated colonies on agar medium. The strain grew in a wide range of NaCl concentrations (6 % to saturation) and required at least 1 mM Mg2+ for growth. Strain M6T was able to reduce sulfur to sulfide anaerobically. 16S rRNA gene sequence analysis indicated that strain M6T belongs to the family Halobacteriaceae, genus Haloferax; it showed 96·7–98·0 % similarity to other members of the genus with validly published names and 89 % similarity to Halogeometricum borinquense, its closest relative outside the genus Haloferax. Polar lipid analysis and DNA G+C content further supported placement of strain M6T in the genus Haloferax. DNA–DNA hybridization values, as well as biochemical and physiological characterization, allowed strain M6T to be differentiated from other members of the genus Haloferax. A novel species, Haloferax sulfurifontis sp. nov., is therefore proposed to accommodate the strain. The type strain is M6T (=JCM 12327T=CCM 7217T=DSM 16227T=CIP 108334T).
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain M6T is AY458601.
Scanning electron micrographs showing cells of strain M6T are available as supplementary material in IJSEM Online.
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