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Williamsia marianensis sp. nov., a novel actinomycete isolated from the Mariana Trench

Wasu Pathom-aree^1,, Yuichi Nogi², Iain C. Sutcliffe³, Alan C. Ward¹, Koki Horikoshi², Alan T. Bull⁴ and Michael Goodfellow¹

¹ Division of Biology, King George VI Building, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
² Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
³ School of Applied Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
⁴ Department of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK

Correspondence
Michael Goodfellow
m.goodfellow{at}ncl.ac.uk

The taxonomic status of an actinomycete isolated from sediment collected from the Mariana Trench was established using a combination of genotypic and phenotypic data. Isolate MT8^T had chemotaxonomic and morphological properties consistent with its classification in the genus Williamsia, and formed a distinct phyletic line in the 16S rRNA gene tree together with the type strain of Williamsia muralis. The isolate was readily distinguished from the latter, and from representatives of other Williamsia species, using DNA–DNA relatedness and phenotypic criteria. Predominant cellular fatty acids were oleic, palmitic and tuberculostearic acids and a hexadecenoic acid. The DNA G+C content was 65.2 mol%. It is apparent that the isolate belongs to a novel species of Williamsia. Strain MT8^T (=DSM 44944^T=NCIMB 14085^T) was thus considered to be the type strain of a novel species in the genus Williamsia, for which the name Williamsia marianensis sp. nov. is proposed.

Present address: Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.

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