Menaquinone-mediated regulation of membrane fluidity is relevant for fitness of Listeria monocytogenes.

Listeria monocytogenes is a food-borne pathogen with the ability to grow at low temperatures down to - 0.4 °C. Maintaining cytoplasmic membrane fluidity by changing the lipid membrane composition is important during growth at low temperatures.

sp. nov., a pink-coloured organism isolated from cheese made of cow's milk.

A pink-coloured bacterium (strain KR32) was isolated from cheese and assigned to the ' group'. Members of the 'pink group' form a stable clade (100 % bootstrap value) and contain the species , and , which share ≥99.0 % 16S rRNA gene sequence similarity.