Thermasporomyces composti gen. nov., sp. nov., a thermophilic actinomycete isolated from compost

Shuhei Yabe, Yoshifumi Aiba, Yasuteru Sakai, Masaru Hazaka, Akira Yokota

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11 Citations (Scopus)


A thermophilic, Gram-positive bacterium that formed a branched vegetative mycelium was isolated from compost. The strain, designated I3T, grew at temperatures between 35 and 62 °C, with optimum growth at 50-55 °C. No growth was observed below 29 °C or above 65 °C. The pH range for growth was 5.7-10.0, the pH for optimum growth was 7.0 and no growth was observed below pH 5.6 or above pH 10.8. The DNA G+C content of strain I3 T was 69.2 mol%. The major fatty acids found were C15 : 0 iso (14.2 %), C15 : 0 anteiso (12.1 %), C17 : 0 iso (16.3 %) and C17 : 0 anteiso (21.7 %). The major menaquinones were MK-9(H4), MK-10(H4) and MK-11(H4). The cell wall contained glutamic acid, glycine, alanine and LL-diaminopimelic acid in a molar ratio of 1.0 : 3.9 : 0.6 : 0.5. The polar lipids consisted of ninhydrin-positive phosphoglycolipids, phosphatidylglycerol, diphosphatidylglycerol and an unknown glycolipid. The cell-wall sugars were rhamnose and arabinose. 16S rRNA gene sequence analysis assigned this actinomycete to the family Nocardioidaceae, but its 16S rRNA gene sequence shared no more than 95.5% similarity with those of other members of the family. The chemotaxonomic and phenotypic characteristics of strain I3T differed in some respects from those of members of the genus Actinopolymorpha, the most closely related genus. Therefore, strain I3T represents a novel species in a new genus of the family Nocardioidaceae, for which the name Thermasporomyces composti gen. nov., sp. nov. is proposed. The type strain of the type species is I3T (=JCM 16421T=DSM 22891 T).

Original languageEnglish
Pages (from-to)86-90
Number of pages5
JournalInternational journal of systematic and evolutionary microbiology
Issue number1
Publication statusPublished - 2011 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics


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