The function of PANK4 (pantothenate kinase 4 (inactive), ENSG00000157881) is as follows. Phosphatase which shows a preference for 4'- phosphopantetheine and its oxidatively damaged forms (sulfonate or S- sulfonate), providing strong indirect evidence that the phosphatase activity pre-empts damage in the coenzyme A (CoA) pathway (PubMed:27322068). Hydrolyzing excess 4'-phosphopantetheine could constitute a directed overflow mechanism to prevent its oxidation to the S-sulfonate, sulfonate, or other forms (PubMed:27322068). Hydrolyzing 4'-phosphopantetheine sulfonate or S-sulfonate would forestall their conversion to inactive forms of CoA and acyl carrier protein (PubMed:27322068). May play a role in the physiological regulation of CoA intracellular levels (Probable). .