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Diamine oxidase (DAO), also known "amine oxidase, copper-containing, 1" (AOC1), formerly called histaminase, [1] is an enzyme (EC 1.4.3.22) involved in the metabolism, oxidation, and inactivation of histamine and other polyamines such as putrescine or spermidine. The enzyme belongs to the amine oxidase (copper-containing) (AOC) family of amine ...
It has been shown that decreased DAO activity leads to an increase in NMDA activity in the hypothalamus. [1] Inhibition of DAO leads to the increase of D-serine levels which act as agonists at the NMDAR. [8] A study confirmed the increased NMDA activity and showed increased DAO activity in the cerebellum of schizophrenia subjects. [6]
D-aspartate oxidase EC 1.4.3.1 (DASOX) [1] is an enzyme, structurally related to DAO, which catalyses the same reaction but is active only toward dicarboxylic D-amino acids. In DAO, a conserved histidine has been shown [2] to be important for the enzyme's catalytic activity.
Histamine intolerance is a presumed set of adverse reactions to ingested histamine in food believed to be associated with flawed activity of DAO and HNMT enzymes. [56] This set of reactions include cutaneous reactions (such as itching, flushing and edema), gastrointestinal symptoms (such as abdominal pain and diarrhea), respiratory symptoms ...
The first such enzyme was discovered in 1928 by Mary Bernheim in the liver and was named tyramine oxidase. [3] [4] The MAOs belong to the protein family of flavin-containing amine oxidoreductases. [5] MAOs are important in the breakdown of monoamines ingested in food, and also serve to inactivate monoamine neurotransmitters.
Histamine, a biogenic amine found in various food products, is frequently implicated as a potential instigator of a range of health issues. [1] These issues are often collectively referred to under the umbrella term "histamine intolerance", [1] formulated drawing parallels to "lactose intolerance", a condition resulting from lactase enzyme deficiency.
Oxidoreductases, enzymes that catalyze oxidation-reduction reactions, constitute Class EC 1 of the IUBMB classification of enzyme-catalyzed reactions. [2] Any of these may be called dehydrogenases, especially those in which NAD + is the electron acceptor (oxidant), but reductase is also used when the physiological emphasis on reduction of the substrate, and oxidase is used only when O 2 is the ...
4129 109731 Ensembl ENSG00000069535 ENSMUSG00000040147 UniProt P27338 Q8BW75 RefSeq (mRNA) NM_000898 NM_172778 RefSeq (protein) NP_000889 NP_766366 Location (UCSC) Chr X: 43.77 – 43.88 Mb Chr X: 16.58 – 16.68 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Monoamine oxidase B (MAO-B) is an enzyme that in humans is encoded by the MAOB gene. The protein encoded by this gene belongs ...