polyhedral organelle propanediol degradation polyhedral organelle An organelle found in bacteria consisting of a proteinaceous coat containing enzymes for the degradation of 1,2-propanediol whose purpose is the protection of the rest of the cell from the toxic propionaldehyde product of the enzyme diol dehydratase. [database_cross_reference: GOC:js][database_cross_reference: PMID:10498708][database_cross_reference: PMID:11844753][database_cross_reference: PMID:12923081] http://purl.obolibrary.org/obo/go.owl