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TitleThermorudis pharmacophila sp. Nov., a novel member of the class thermomicrobia isolated from geothermal soil, and emended descriptions of thermomicrobium roseum, thermomicrobium carboxidum, thermorudis peleae and sphaerobacter thermophilus
Publication TypeJournal Article
Year of Publication2015
AuthorsHoughton, K.M., Morgan X.C., Lagutin K., Mackenzie A.D., Vyssotskii M., Mitchell K.A., McDonald I.R., Morgan H.W., Power J.F., Moreau J.W., Hanssen E., and Stott M.B.
JournalInternational Journal of Systematic and Evolutionary Microbiology
Pagination4479 - 4487
Date Published2015
ISSN14665026 (ISSN)
Keywords1 acylalkyldiol 1 o phosphoinositol, 2 acylalkyldiol 1 o phosphoacylmannoside, 2 acylalkyldiol 1 o phosphoinositol acylmannoside, 2 acylalkyldiol 1 o phosphoinositol mannoside, aerobic bacterium, alcohol derivative, ampicillin, animal cell, antibiotic sensitivity, article, bacterial DNA, bacterial growth, bacterial strain, bacterium isolate, biochemical analysis, carboxylic acid, chemotaxonomy, chloramphenicol, Chloroflexi, cysteine, DNA DNA hybridization, fatty acid, gene sequence, geothermal energy, glycine, Gram negative bacterium, Heating, kanamycin, lasalocid, lipid, menadione epoxide, menaquinone, metronidazole, monosaccharide, neomycin, new zealand, nonhuman, pH, phenotype, phospholipid, phylogeny, phylum, polymyxin B, priority journal, protein derivative, quinone derivative, RNA 16S, Soil, species differentiation, Sphaerobacter thermophilus, streptomycin, Thermomicrobium carboxidum, Thermomicrobium roseum, Thermorudis peleae, Thermorudis pharmacophila, trimethoprim, type strain, unclassified drug, vancomycin
AbstractAn aerobic, thermophilic and cellulolytic bacterium, designated strain WKT50.2T, was isolated from geothermal soil at Waikite, New Zealand. Strain WKT50.2T grew at 53–76 °C and at pH 5.9–8.2. The DNA G+C content was 58.4 mol%. The major fatty acids were 12-methyl C18 : 0 and C18 : 0. Polar lipids were all linked to long-chain 1,2-diols, and comprised 2- acylalkyldiol-1-O-phosphoinositol (diolPI), 2-acylalkyldiol-1-O-phosphoacylmannoside (diolP-acylMan), 2-acylalkyldiol-1-O-phosphoinositol acylmannoside (diolPI-acylMan) and 2-acylalkyldiol-1-O-phosphoinositol mannoside (diolPI-Man). Strain WKT50.2T utilized a range of cellulosic substrates, alcohols and organic acids for growth, but was unable to utilize monosaccharides. Robust growth of WKT50.2T was observed on protein derivatives. WKT50.2T was sensitive to ampicillin, chloramphenicol, kanamycin, neomycin, polymyxin B, streptomycin and vancomycin. Metronidazole, lasalocid A and trimethoprim stimulated growth. Phylogenetic analysis of 16S rRNA gene sequences showed that WKT50.2T belonged to the class Thermomicrobia within the phylum Chloroflexi, and was most closely related to Thermorudis peleae KI4T (99.6% similarity). DNA–DNA hybridization betweenWKT50.2T and Thermorudis peleae DSM 27169T was 18.0%. Physiological and biochemical tests confirmed the phenotypic and genotypic differentiation of strainWKT50.2T from Thermorudis peleae KI4T and other members of the Thermomicrobia. On the basis of its phylogenetic position and phenotypic characteristics, we propose that strain WKT50.2T represents a novel species, for which the name Thermorudis pharmacophila sp. nov. is proposed, with the type strainWKT50.2T (=DSM 26011T=ICMP 20042T). Emended descriptions of Thermomicrobium roseum, Thermomicrobium carboxidum, Thermorudis peleae and Sphaerobacter thermophilus are also proposed, and include the description of a novel respiratory quinone, MK-8 2,3-epoxide (23%), in Thermomicrobium roseum. © 2015 IUMS.

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