Melghirimyces thermohalophilus sp. nov., a novel thermoactinomycete isolated from an Algerian salt lake
Résumé
A novel filamentous bacterium designated Nari11AT was isolated from soil collected from a salt lake named Chott Melghir located in south east of Algeria. The strain is an aerobic, halophilic, thermotolerant, Gram-positive bacterium, growing at NaCl concentrations between 5 and 20% w/v and temperature and pH ranges between 43-60 °C and 5.0-10.0, respectively. The major fatty acids were isoC15:0, anteisoC15:0 and isoC17:0. The G+C value was 53.4 mol %. LL-diaminopimelic acid was the diamino acid of the peptidoglycan. The major menaquinone was MK-7, but MK-6 and MK-8 were also present in trace amounts. The polar lipids' profile consisted of phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine and three unidentified phospholipids. Results of molecular and phenotypic analysis led to the description of the strain as a new member to the genus Melghirimyces, family Thermoactinomycetaceae. Strain Nari11AT shows a 16S rRNA gene sequence similarity of 96.7% with Melghirimyces algeriensis. On the basis of phenotypic, physiological and phylogenetical data the type strain Nari11AT (DSM 45514T =CCUG 60050T) represents a new species for which the name Melghirimyces thermohalophilus sp. nov., is proposed.
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