The function of PANK2 (pantothenate kinase 2, Ensembl gene identifier ENSG00000125779) is as follows. [Isoform 1]: Mitochondrial isoform that catalyzes the phosphorylation of pantothenate to generate 4'-phosphopantothenate in the first and rate-determining step of coenzyme A (CoA) synthesis (PubMed:15659606, PubMed:16272150, PubMed:17242360, PubMed:17825826). Required for angiogenic activity of umbilical vein of endothelial cells (HUVEC) (PubMed:30221726). {ECO:0000269|PubMed:15659606, ECO:0000269|PubMed:16272150, ECO:0000269|PubMed:17242360, ECO:0000269|PubMed:17825826, ECO:0000269|PubMed:30221726}. [Isoform 4]: Cytoplasmic isoform that catalyzes the phosphorylation of pantothenate to generate 4'-phosphopantothenate in the first and rate-determining step of coenzyme A (CoA) synthesis. .