Journal
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
Volume 62, Issue -, Pages 1486-1490Publisher
MICROBIOLOGY SOC
DOI: 10.1099/ijs.0.030866-0
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Funding
- Ministry of Agriculture and Rural Development (Hungary) [OMFB-00977/2005]
- Hungarian Scientific Research Fund [OTKA K 83764]
- Ministry of Education and Culture, Hungary [DFO 0054/2009]
- European Union
- European Social Fund [TAMOP 4.2.1./B-09/1/KMR-2010-0003]
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A Gram-stain-negative, rod-shaped bacterium (strain K-39(T)) was isolated from the thermophilic phase of the composting process for oyster mushroom substrate preparation. The strain grew at 40-80 degrees C (optimum, 65-75 degrees C), at pH 5-9 (optimum, pH 7), in media containing up to 1.5% (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain K-39(T) formed a distinct lineage within the genus Thermus. Its closest cultivated relative was Thermus islandicus PRI 3838(T) (96.8% similarity). The DNA G + C content of strain K-39(T) was 71.3 mol%. The new strain could be differentiated from the related taxa by not being able to hydrolyse starch. The predominant fatty acids of strain K-39(T) were iso-C-17:0 and anteiso-C-17:0. Strain K-39(T) contained a lower amount of the fatty acid iso-C-15:0 as compared to related species of the genus Thermus. The predominant respiratory quinone of the new isolate was menaquinone MK-8. On the basis of a taxonomic study using a polyphasic approach, strain K-39(T) is considered to represent a novel species of the genus Thermus, for which the name Therm us composti sp. nov. is proposed: The type strain is K-39(T) (=DSM 21686(T)=NCAIM B 02340(T)).
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