1887

Abstract

Screening of soil samples from the Durmitor National Park, Serbia and Montenegro, for strains producing immunosuppressants with a similar mechanism of action to FK506 resulted in the isolation of the actinomycete strain MS405. Isolate MS405 was found to have morphological and phenotypic properties that were consistent with its classification as a strain. The DNA G+C content of strain MS405 was 72 mol%. 16S rRNA gene sequence data confirmed the taxonomic position of the strain, following the generation of phylogenetic trees by using various treeing algorithms. On the basis of 16S rRNA gene sequence similarity, strain MS405 was shown to belong to the ‘supercluster’, being related to DSM 41785 (99.59 % similarity) and DSM 40500 (99.32 %). The 16S–23S rRNA internally transcribed spacer (ITS) region exhibited variations in length and sequence composition, showing limited usefulness in phylogenetic analyses. However, DNA relatedness values support the classification of this isolate within a novel species. A number of physiological and biochemical tests distinguished strain MS405 from its closest phylogenetic neighbours. Therefore, strain MS405 represents a novel species, for which the name sp. nov. is proposed, with the type strain MS405 (=DSM 41863 =CIP 108995).

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2007-09-01
2019-10-21
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Sequences of variable regions within the 16S–23S ITS regions of clones of strain MS405 . [PDF](36 KB)

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Scanning and transmission electron micrographs showing strain MS405 . (a) Scanning electron micrograph showing smooth-surfaced spore chains. (b, c) Thin sections through aerial mycelium as seen by transmission electron microscopy. Bars, 1 µm (a, b) and 0.5 µm (c). Original magnification, ×20000 (a), ×18900 (b) and ×77000 (c).

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