Updated project metadata. In this study, mice were colonized from birth on with the minimal microbiota Oligo-MM with or without the addition of Extibacter muris. Extibacter muris is known to metabolize cholic acid to deoxycholic acid via 7α-dehydroxylation. The impact of Extibacter muris colonization on the liver proteome of mice under different diets was investigated using untargeted proteomics.