Gordonia humi sp. nov., isolated from soil

Area of Science:

• Microbiology
• Bacteriology
• Taxonomy

Background:

• Actinobacteria are crucial soil microorganisms with diverse metabolic capabilities.
• The genus Gordonia comprises Gram-positive bacteria known for their ecological roles and potential biotechnological applications.
• Accurate bacterial classification is essential for understanding microbial communities and their functions.

Purpose of the Study:

• To characterize and classify a newly isolated actinobacterium from soil associated with Agaricus brasiliensis cultivation.
• To determine the taxonomic position of strain CC-12301(T) within the genus Gordonia.
• To differentiate the novel isolate from closely related Gordonia species through phenotypic and chemotaxonomic analyses.

Main Methods:

• Isolation and cultivation of actinobacteria from soil samples.
• 16S rRNA gene sequencing for phylogenetic analysis.
• Chemotaxonomic analyses including quinone system, polar lipid profile, and fatty acid composition.
• Physiological and biochemical tests for phenotypic characterization.

Main Results:

• Strain CC-12301(T) was identified as a Gram-positive, non-endospore-forming actinobacterium belonging to the genus Gordonia.
• Phylogenetic analysis based on 16S rRNA gene sequences showed highest similarity to Gordonia hydrophobica (97.6%).
• Chemotaxonomic data (menaquinone MK-9(H2), polar lipids, mycolic acids, fatty acids) supported its placement within the Gordonia genus.
• Distinct physiological and biochemical profiles differentiated strain CC-12301(T) from its closest relatives.

Conclusions:

• Strain CC-12301(T) represents a novel species within the genus Gordonia.
• The proposed name for this new species is Gordonia humi sp. nov.
• The type strain is CC-12301(T) (=DSM 45298(T) =CCM 7727(T)).