histidinase his·ti·di·nase (hĭs’tĭ-də-nās’, -nāz’)
See histidine ammonia-lyase.
[his-ti-deen, -din] /ˈhɪs tɪˌdin, -dɪn/ noun, Biochemistry. 1. an essential amino acid, C 3 H 3 N 2 CH 2 CH(NH 2)COOH, that is a constituent of proteins and is important as the iron-binding site in hemoglobin. Symbol: H. Abbreviation: His; /ˈhɪstɪˌdiːn; -dɪn/ noun 1. a nonessential amino acid that occurs in most proteins: a […]
- Histidine ammonia-lyase
histidine ammonia-lyase n. An enzyme that catalyzes the deamination of histidine to urocanate. Also called histidase, histidinase.
- Histidine decarboxylase
histidine decarboxylase n. An enzyme that catalyzes the decarboxylation of histidine to histamine.
histidinemia his·ti·di·ne·mi·a (hĭs’tĭ-də-nē’mē-ə) n. A hereditary disorder characterized by an elevation of histidine levels in the blood, excretion of histidine in the urine due to deficient histidase activity, and often manifested clinically by mild mental retardation.