Streptomyces atriruber sp. nov. and Streptomyces silaceus sp. nov., two novel species of equine origin.

The research identified and examined two new strains of the Streptomyces bacteria that were isolated from lesions on horse placentas. The strains, named Streptomyces atriruber and Streptomyces silaceus, were defined by their distinctive colors, dark red and deep orange-yellow respectively.

Research Methodology

• The scientists used a polyphasic taxonomic approach, which considers phenotypic and genotypic information, to analyze the new actinomycete strains.
• The phylogenetic analysis of 16S rRNA gene sequences was one of the key techniques employed. This involved comparing the genetic information of the new strains with existing genetic data of known Streptomyces species.
• Morphological observations were also used to identify the new strains. The researchers closely examined the physical structure and properties of the strains, specifically their distinctive dark red and deep orange-yellow colors.
• The chemical structure of the strains was investigated further by identifying ll-diaminopimelic acid – a diamino acid common in the cell walls of bacteria – in the whole-cell hydrolysates.

Key Findings

• Phylogenetic analysis revealed the new strains were part of the Streptomyces genus, a highly diverse group of bacteria known to produce over two-thirds of the clinically useful antibiotics of natural origin.
• The study confirmed that the strains differ from all existing known species in terms of both the genetic make-up and morphological characteristics, therefore representing novel species within the Streptomyces genus.
• Finally, the strains were named Streptomyces atriruber and Streptomyces silaceus, originating from their distinctive dark red and deep orange-yellow colors respectively.

Significance and Implications

• The discovery of the new species could potentially contribute to the production of new antibiotics to fight against drug-resistant diseases, considering the well-known antibiotic-producing property of Streptomyces species.
• The unique genetic makeup and physical properties of these strains could provide valuable insights into the biology and ecology of Streptomyces bacteria, and could serve as an important resource for future research in taxonomy, genetics, and microbiology.