1887

Abstract

A Gram-reaction-positive aerobic actinomycete, designated strain IM17-1, was isolated from a honey bee () hive in Chiang Mai Province, Thailand. The strain formed a branched substrate mycelium and mature aerial mycelium bore short chains of arthrospores with warty surfaces. The cell wall contained -2,6-diaminopimelic acid (cell-wall type III) and the whole cell sugars were fucose, galactose, glucose, madurose, mannose and ribose. The major isoprenoid quinone was hexahydrogenated menaquinone with nine isoprene units and the predominant cellular fatty acids were C (33.8 %), Cω9 (32.7 %), summed feature 3 (Cω7 and/or iso-C 2-OH) (8.7 %) and 10-methyl C (8.2 %). The phospholipids were diphosphatidylglycerol, phosphatidylinositol and phosphatidylinositol mannosides. These morphological and chemotaxonomic characteristics were consistent with the classification of IM17-1 within the genus . Based on 16S rRNA gene sequence analysis, strain IM17-1 was closely related to the type strains of subsp. (98.1 %) and subsp. (98.6 %); however, it represented a distinct phylogenetic lineage from the other species within this genus. The unique genetic characteristics were reaffirmed by low levels of DNA–DNA relatedness between strain IM17-1 and the two most closely related type strains, subsp. JCM 3308 (56.5±4.9 %) and subsp. JCM 3309 (31.0±22.6 %), and further supported the proposal of IM17-1 as a novel species. Strain IM17-1 ( = JCM 16576  = TISTR 1980) thus represents a novel species of the genus , for which the name sp. nov. is proposed. In addition, the genotypic and phenotypic data suggested the reclassification of subsp. Gauze 1987 as a separate species, sp. nov., comb. nov.

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2011-09-01
2019-10-19
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vol. , part 9, pp. 2271 - 2277

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