International Journal of Systematic and Evolutionary Microbiology, Vol 52, 2291-2295, Copyright © 2002 by Society for General Microbiology

Nocardiopsis metallicus sp. nov., a metal-leaching actinomycete isolated from an alkaline slag dump

A. Schippers, K. Bosecker, S. Willscher, C. Sproer, P. Schumann and R. M. Kroppenstedt
Bundesanstalt fur Geowissenschaften und Rohstoffe, Stilleweg 2,D-30655 Hannover, Germany

A taxonomic study was carried out on a metal-mobilizing, alkaliphilic bacterium from an alkaline slag dump, strain KBS6(T). The strain produced substrate and aerial mycelia. Growth occurred in the pH range 7.0--10.5, with an optimum at pH 8.5. A salt concentration of up to 10% was tolerated, and various organic substrates were used for growth. The results of a 16S rDNA sequence comparison revealed that strain KBS6(T) belongs to the genus Nocardiopsis. DNA--DNA hybridization with the two closest relatives, Nocardiopsis exhalans and Nocardiopsis prasina, gave similarity values of 18.2 and 44.1%, respectively, which indicated that strain KBS6(T) represents a novel species of the genus Nocardiopsis. This is consistent with the morphological, physiological and chemotaxonomic data. Because of the ability of this micro-organism to solubilize metals, the name Nocardiopsis metallicus sp. nov. is proposed for strain KBS6(T) (=DSM 44598(T)=NRRL B-24159(T)), this being the type strain.

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