Component of the phosphopantothenoylcysteine decarboxylase (PPCDC) involved in the coenzyme A synthesis. Component of the phosphopantothenoylcysteine decarboxylase (PPCDC) complex, a heterotrimer composed of CAB3, HAL3 and VHS3. Present with 2940 molecules/cell in log phase SD medium. Belongs to the HFCD (homooligomeric flavin containing Cys decarboxylase) superfamily.