Involved in both the tricarboxylic acid (TCA) and methylcitric acid cycles (PubMed:28956599). Has both 2-methylcitrate dehydratase and citrate dehydratase activities. Catalyzes the dehydration of 2-methylcitrate (2-MC) to yield 2-methyl-cis-aconitate, and the dehydration of citrate to yield cis-aconitate. Cannot form isocitrate. Uses either (2S,3R)- or (2R,3S)-2-methylcitrate (PubMed:28956599). 2-methylcitrate = 2-methyl-cis-aconitate + H2O citrate = cis-aconitate + H2O Expressed in the mother cell at intermediate stages of sporulation under the control of the sigma-E factor. Subject to catabolite repression. Belongs to the PrpD family.