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Classification of thermophilic streptomycetes, including the description of Streptomyces thermoalcalitolerans sp. nov.

Bongcheol Kim^1,2, Nevzat Sahin^2,, David E. Minnikin³, Jolanta Zakrzewska-Czerwinska⁴, Marian Mordarski⁴ and Michael Goodfellow^1,2

¹Department of Agricultural and Environmental Science, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
²Department of Microbiology, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
³Department of Chemistry, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
⁴Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Czerska 12, 53--114 Wroclaw, Poland

Author for correspondence: Michael Goodfellow. Tel: + 44 191 222 7706. Fax: +44 191 222 5228. e-mail: m.goodfellow{at}ncl.ac.uk

ABSTRACT

A polyphasic taxonomic study was undertaken to clarify relationships within and between representative thermophilic alkalitolerant streptomycetes isolated from soil and appropriate marker strains. The resultant data, notably those from DNA-DNA relatedness studies, support the taxonomic integrity of the validly described species Streptomyces thermodiastaticus, Streptomyces thermoviolaceus and Streptomyces thermonvulgaris. However, the genotypic and phenotypic data clearly show that Streptomyces thermonitrificans Desai and Dhala 1967 and S. thermovulgaris (Henssen 1957) Goodfellow et al. 1987 represent a single species. On the basis of priority, S. thermonitrificans is a later subjective synonym of of S. thermovulgaris. Similarly, 10 out of the 11 representative thermophilic alkalitolerant isolates had a combination of properties consistent with their classification as S. thermovulgaris. The remaining thermophilic alkalitolerant isolate, Streptomyces strain TA56, merited species status. The name Streptomyces thermoalcalitolerans sp. nov. is proposed for this strain. A neutrophilic thermophilic isolate, Streptomyces strain NAR85, was identified as S. thermodiastaticus.

Key Words: classification • thermophilic streptomycetes • Streptomyces thermoalcalitolerans sp. nov.

Present address:OMÜ Egitim Fakültesi, Biyoloji Bölümü, 55200 Atakum-Samsun, Turkey.

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