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Dietzia, New Genus Including Dietzia maris comb. nov., Formerly Rhodococcus maris

DSM-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany

^* Corresponding author. Mailing address: DSM-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1B, D-38124 Braunschweig, Germany. Phone: 49 531 2616 352. Fax: 49 531 2616 418. Electronic mail address: Stackebrandt{at}venus.gbf-braunschweig.d400.de.

ABSTRACT

Sequencing of the 16S ribosomal DNAs (rDNA) of two strains of Rhodococcus maris was performed to determine the relationship of this species to other mycolic acid-containing actinomycetes. For this purpose we also determined the 16S rDNA sequences for the type species of the genus Rhodococcus, Rhodococcus rhodochrous, and for Mycobacterium chlorophenolicum (formerly Rhodococcus chlorophenolicus), Rhodococcus erythropolis, Gordona bronchialis, and Gordona terrae, for which only partial sequence data have been available previously. The sequences of the two strains of R. maris were identical. The results of a distance matrix analysis indicated that R. maris is not a member of the genus Rhodococcus but is located between members of the genus Corynebacterium and members of the Rhodococcus-Nocardia-Mycobacterium-Gordona-Tsukamurella cluster. The finding that R. maris is phylogenetically isolated is supported by the presence of N-acetyl residues in the glycan moiety of the peptidoglycan and the lack of phosphatidylinositol and phosphatidylinositol mannosides, characteristics which distinguish this taxon from related taxa. On the basis of our results and previous findings, we propose that R. maris should be reclassified in a new genus, Dietzia. The type species is Dietzia maris comb. nov.

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