Controls both the activation and catalytic activity of PanD in a coenzyme A (CoA)-dependent fashion (By similarity). Binding of CoA or a derivative to PanM leads to interaction with PanD, which promotes the processing and activation of pro-PanD, and subsequent substrate-mediated inhibition of the active form of PanD (By similarity) (PubMed:22497218, PubMed:22782525). Lacks acetyltransferase activity (PubMed:22782525). Interacts with PanD in the presence of CoA (PubMed:22497218, PubMed:22782525). Monomer (PubMed:22497218). Deletion results in a pantothenate auxotrophy. Deletion mutant accumulates pro-PanD. Belongs to the PanZ/PanM family. Lacks the conserved catalytic glutamate found in many enzymatically active members of the Gcn5-like N-acetyltransferase (GNAT) family.