Journal
SYSTEMATIC AND APPLIED MICROBIOLOGY
Volume 30, Issue 2, Pages 152-164Publisher
ELSEVIER GMBH
DOI: 10.1016/j.syapm.2006.04.003
Keywords
Geobacillus thermoleovorans; extremophiles; thermophilic bacilli; lipase; deep subsurface bacteria
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A thermophilic facultative bacterial isolate was recovered from 3.2 kin depth in a gold mine in South Africa. This isolate, designated GE-7, was cultivated from pH 8.0, 50 degrees C water from a dripping fracture near the top of an exploration tunnel. GE-7 grows optimally at 65 degrees C and pH 6.5 on a wide range of carbon substrates including cellobiose, hydrocarbons and lactate. In addition to O-2, GE-7 also utilizes nitrate as an electron acceptor. GE-7 is a long rod-shaped bacterium (4-6 mu m long x 0.5 mu m wide) with terminal endospores and flagella. Phylogenetic analysis of GE-7 16S rDNA sequence revealed high sequence similarity with G. thermoleovorans DSM 5366(T) (99.6%), however, certain phenotypic characteristics of GE-7 were distinct from this and other previously described strains of G. thermoleovorans. (c) 2006 Elsevier GmbH. All rights reserved.
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