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Int J Syst Evol Microbiol 59 (2009), 2032-2035; DOI  10.1099/ijs.0.007971-0
© 2009 International Union of Microbiological Societies

Streptomyces hypolithicus sp. nov., isolated from an Antarctic hypolith community

Marilize Le Roes-Hill1,{dagger}, Jeffrey Rohland2, Paul R. Meyers2, Don A. Cowan3 and Stephanie G. Burton1,{dagger}

1 Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch, 7701 Cape Town, South Africa
2 Department of Molecular and Cell Biology, University of Cape Town, Private Bag X3, Rondebosch, 7701 Cape Town, South Africa
3 Institute for Microbial Biotechnology and Metagenomics, Department of Biotechnology, University of the Western Cape, Bellville, 7535 Cape Town, South Africa

Correspondence
Stephanie G. Burton
BurtonS{at}cput.ac.za

As part of an enzyme-screening programme, an actinobacterium, strain HSM#10T, was isolated from a sample collected from the base of a translucent quartz rock in Miers Valley, eastern Antarctica. The isolate produced branching vegetative mycelium that was characteristic of filamentous actinobacteria. The chemotaxonomic characteristics of the strain suggested that HSM#10T should be classified as a member of the genus Streptomyces. Furthermore, phylogenetic analysis based on 16S rRNA gene sequences showed that the strain was closely related to members of the genus Streptomyces, which supports the classification of this strain within the family Streptomycetaceae. Phenotypic and phylogenetic results allowed strain HSM#10T to be differentiated from known streptomycetes. DNA–DNA hybridization data also showed that strain HSM#10T could be differentiated from its nearest phylogenetic neighbours Streptomyces chryseus DSM 40420T (53.55±3.15 % DNA relatedness), Streptomyces helvaticus DSM 40431T (38.75±2.75 %), Streptomyces flavidovirens DSM 40150T (30.7±2.90 %) and Streptomyces albidochromogenes DSM 41800T (33.9±0.10 %). Therefore, the name Streptomyces hypolithicus sp. nov. is proposed, with HSM#10T (=DSM 41950T =NRRL B-24669T) as the type strain.

{dagger}Present address: Biocatalysis and Technical Biology Research Group, Cape Peninsula University of Technology, Bellville Campus, PO Box 1906, Bellville, 7535 Cape Town, South Africa.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain HSM#10T is EU196762.

Growth characteristics of strain HSM#10T and closely related strains on different agar media are available as supplementary material with the online version of this paper.






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