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Amycolatopsis nigrescens sp. nov., an actinomycete isolated from a Roman catacomb

¹ Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie e.V., Hans-Knöll-Institut, Beutenbergstrasse 11a, 07745 Jena, Germany
² Institute of Biological Sciences (Microbiology), Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
³ Instituto de Recursos Naturales y Agrobiologia, CSIC, Apartado 1052, 41080 Sevilla, Spain
⁴ Sanofi-Aventis Deutschland GmbH, Industriepark Hoechst, 65926 Frankfurt (Main), Germany
⁵ Division of Biology, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK

Correspondence
Ingrid Groth
Ingrid.Groth{at}hki-jena.de

The taxonomic status of two actinomycetes isolated from the wall of a hypogean Roman catacomb was established based on a polyphasic investigation. The organisms were found to have chemical and morphological markers typical of members of the genus Amycolatopsis. They also shared a range of chemical, molecular and phenotypic markers which served to separate them from representatives of recognized Amycolatopsis species. The new isolates formed a branch in the Amycolatopsis 16S rRNA gene sequence tree with Amycolatopsis minnesotensis NRRL B-24435^T, but this association was not supported by a particularly high bootstrap value or by the product of the maximum-parsimony tree-making algorithm. The organisms were distinguished readily from closely related Amycolatopsis species based on a combination of phenotypic properties and from all Amycolatopsis strains by their characteristic menaquinone profiles, in which tetra-hydrogenated menaquinones with 11 isoprene units predominated. The combined genotypic and phenotypic data indicate that the isolates merit recognition as representing a novel species of the genus Amycolatopsis. The name proposed for this novel species is Amycolatopsis nigrescens sp. nov., with type strain CSC17Ta-90^T (=HKI 0330^T=DSM 44992^T=NRRL B-24473^T).

A table giving the cellular fatty acid compositions of strains CSC17Ta-90^T and CSC17Ta-84 and A. minnesotensis NRRL B-24435^T is available as supplementary material in IJSEM Online.

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