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Streptomyces mexicanus sp. nov., a xylanolytic micro-organism isolated from soil

Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, AP 70228, UNAM, 04510, México DF, Mexico

Correspondence
María Elena Flores
mefc{at}servidor.unam.mx

The taxonomic position of a thermophilic actinomycete strain isolated from soil was examined using a polyphasic approach. The strain, designated CH-M-1035^T, was assigned to the genus Streptomyces on the basis of chemical and morphological criteria. It formed Rectiflexibiles aerial hyphae that carried long chains of rounded, smooth spores. The almost complete nucleotide sequence of the 16S rRNA gene of strain CH-M-1035^T was determined and its comparison with the 16S rDNA sequences of previously studied streptomycetes confirmed the assignment of the novel strain to the genus Streptomyces. Strain CH-M-1035^T clustered with species belonging to the Streptomyces thermodiastaticus clade in the 16S-rDNA-based phylogenetic tree. However, the phenotypic properties of strain CH-M-1035^T differed from those of the recognized species within this clade. Therefore, it is proposed that strain CH-M-1035^T be classified as a novel species within the genus Streptomyces, as Streptomyces mexicanus (type strain CH-M-1035^T =DSM 41796^T =BM-B-384^T =NRRL B-24196^T).

The GenBank accession number for the 16S rDNA sequence of Streptomyces mexicanus CH-M-1035^T is AF441168.

A fuller phylogenetic tree showing the placement of Streptomyces mexicanus CH-M-1035^T within the genus Streptomyces (over 100 species included) can be found in IJSEM Online (http://ijs.sgmjournals.org).

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