Paratractidigestivibacter

Paratractidigestivibacter is a genus of Gram-positive bacteria in the family Atopobiaceae. It was established during a taxonomic revision of certain Coriobacteriales based on phylogenetic and genomic data. The genus currently contains a single known species, Paratractidigestivibacter faecalis, which was originally isolated from human feces.^[1]

Paratractidigestivibacter
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Actinomycetota
Class:	Coriobacteriia
Order:	Coriobacteriales
Family:	Atopobiaceae
Genus:	Paratractidigestivibacter Zgheib et al.
Type species
Paratractidigestivibacter faecalis (Han et al.) Zgheib et al.

Taxonomy

Paratractidigestivibacter belongs to the phylum Actinomycetota, class Coriobacteriia, and order Coriobacteriales. The genus was proposed following the reclassification of the species previously known as Olsenella faecalis, after genome sequencing and 16S rRNA gene analysis revealed that it formed a separate lineage distinct from other members of the genus Olsenella.^[2]

Morphology and physiology

Cells of Paratractidigestivibacter are rod-shaped, strictly anaerobic, non-motile, and non-spore-forming. They grow optimally at 37 °C and pH 7.0, with growth ranges between 30 and 40 °C and pH 5.0–9.0. Colonies are typically white to cream-colored and convex. The organism is catalase- and oxidase-negative, produces acid from mannose, and tolerates up to 1% NaCl. The DNA G+C content is approximately 65.5 mol%.^[3]