CCS is vital for the integration of copper into SOD-1， and as a result is needed for its enzymatic activity. CCS inhibits copper ions from binding to intracellular copper scavengers and provides the SOD-1 enzyme with the required copper cofactor. CCS escorts copper just to SOD-1 and is unable to deliver copper to proteins in the mitochondria， nucleus or secretory pathway. Although many tissues express CCS， the chaperone is most abundant in the kidney， liver and Purkinje cells in the neuropil of the central nervous system.
