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Int J Syst Evol Microbiol. 2015 Oct;65(10):3365-72. doi: 10.1099/ijsem.0.000422.

Geodermatophilus sabuli sp. nov., a γ-radiation-resistant actinobacterium isolated from desert limestone.

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Laboratorie Microorganismes et Biomolécules Actives, Université de Tunis El Manar (FST) & Université de Carthage (INSAT), 2092 Tunis, Tunisia


A novel γ-radiation-resistant and Gram-staining-positive actinobacterium designated BMG 8133T was isolated from a limestone collected in the Sahara desert of Tunisia. The strain produced dry, pale-pink colonies with an optimum growth at 35–40 °C and pH 6.5–8.0. Chemotaxonomic and molecular characteristics of the isolate matched those described for members of the genus Geodermatophilus. The peptidoglycan contained meso-diaminopimelic acid as diagnostic diamino acid. The main polar lipids were phosphatidylcholine, diphosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine and one unspecified glycolipid. MK-9(H4) was the dominant menaquinone. Galactose and glucose were detected as diagnostic sugars. The major cellular fatty acids were branched-chain saturated acids iso-C16 : 0 and iso-C15 : 0. The DNA G+C content of the novel strain was 74.5 %. The 16S rRNA gene sequence showed highest sequence identity with Geodermatophilus ruber (98.3 %). Based on phenotypic results and 16S rRNA gene sequence analysis, strain BMG 8133T is proposed to represent a novel species, Geodermatophilus sabuli sp. nov. The type strain is BMG 8133T ( = DSM 46844T = CECT 8820T).

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