CDO1 (Cysteine Dioxygenase Type 1): CDO1 is an enzyme that catalyzes the conversion of cysteine to cysteine sulfinic acid, a crucial step in the metabolism of sulfur-containing amino acids. This process is essential for regulating cellular cysteine levels and supporting the production of taurine and sulfate. Proper CDO1 function is important for maintaining cellular redox balance, and abnormalities in this enzyme have been linked to various health conditions, including cancer, due to cysteine’s role in cell growth and programmed cell death.