Updated project metadata. Enrichment culture DFE is capable of fermenting the toxic pollutant dichloromethane (DCM; CH2Cl2) into environmentally benign acetate. The dominant organism in the enrichment culture is a novel bacterium in the Peptococcaceae family, “Candidatus Formimonas warabiya” strain DCMF. This metaproteomic study analysed culture DFE during growth with four substrates – DCM, glycine betaine, choline, and methanol – all of which are primarily, if not solely, metabolised by strain DCMF.