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| Histidine Ammonia-Lyase Histidase | Histidinase | Histidine Deaminase | Histidine alpha-Deaminase | Ammonia-Lyase, Histidine | Deaminase, Histidine | Histidine Ammonia Lyase | Histidine alpha Deaminase | alpha-Deaminase, Histidine An enzyme that catalyzes the first step of histidine catabolism, forming UROCANIC ACID and AMMONIA from HISTIDINE. Deficiency of this enzyme is associated with elevated levels of serum histidine. EC 4.3.1.3. |