STUB1 and ovarian carcinoma: For instance, U-box E3 ligase CHIP reduces aerobic glycolysis by ubiquitylating and degrading PKM2 in ovarian carcinoma (OV) cells, while CTLH ubiquitylates PKM2 and lactate dehydrogenase A (LDHA) in a non-degradative pathway, thereby inhibiting glycolysis (19).