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Streptomyces kebangsaanensis sp. nov., an endophytic actinomycete isolated from an ethnomedicinal plant, which produces phenazine-1-carboxylic acid

Sarmin, Nurul' Izzah Mohd and Tan, Geok-Yuan Annie and Franco, Christopher M. M. and Edrada-Ebel, Ruangelie and Latip, Jalifah and Zin, Noraziah (2013) Streptomyces kebangsaanensis sp. nov., an endophytic actinomycete isolated from an ethnomedicinal plant, which produces phenazine-1-carboxylic acid. Journal of Systematic and Evolutionary Microbiology, 63 (10). pp. 3733-3738.

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Abstract

A spore-forming streptomycete designated strain SUK12T was isolated from a Malaysian ethnomedicinal plant. Its taxonomic position, established using a polyphasic approach, indicates that it is a novel species of the genus Streptomyces. Morphological and chemical characteristics of the strain were consistent with those of members of the genus Streptomyces. Analysis of the almost complete 16S rRNA gene sequence placed strain SUK12T in the genus Streptomyces where it formed a distinct phyletic line with recognized species of this genus. The strain exhibited highest sequence similarity to Streptomyces corchorusii DSM 40340T (98.2 %) followed by Streptomyces chrestomyceticus NRRL B-3310T (98.1 %). The G+C content of the genomic DNA was 74 mol%. Chemotaxonomic data [MK-9(H8) as the major menaquinone; LLdiaminopimelic acid as a component of cell-wall peptidoglycan; C12: 0, C14: 0, C15: 0 and C17: 1 as the major fatty acids; phospholipid type II] supported the affiliation of strain SUK12T to the genus Streptomyces. The results of the phylogenetic analysis and phenotypic data derived from this and previous studies allowed the genotypic and phenotypic differentiation of strain SUK12T from the related species of the genus Streptomyces. The DNA-DNA relatedness value between strain SUK12T and S. corchorusii DSM 40340T is 18.85±4.55 %. Strain SUK12T produces phenazine-1-carboxylic acid, known as tubermycin B, an antibacterial agent. It is proposed, therefore, that strain SUK12T (=DSM 42048T=NRRL B-24860T) be classified in the genus Streptomyces as the type strain of Streptomyces kebangsaanensis sp. nov.