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 (trĭp′tə-făn′) also tryp·to·phane (-fān′)
An essential amino acid, C11H12N2O2, formed from proteins during digestion by the action of proteolytic enzymes. It is necessary for normal growth and development and is the precursor of several substances, including serotonin and niacin.

[trypt(ic), of trypsin (formed on the model of pepsin, peptic); see trypsin + -phan(e).]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tryptophane - an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin
essential amino acid - an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet
References in periodicals archive ?
Les legumineuses sont riches en acides amines tryptophane et lysine qui sont deficients dans les cereales [20, 21].
The influence of various amounts of pyridoxine hydrochloride upon the abnormal tryptophane load test in pregnant women.
Moreover, micronutrients activate several enzymes (catalase, carbonic dehydrogenize, tryptophane synthates etc.
G) Arginine dihydrolase production (ADH) Lysine decarboxylase Variable production(LDC) Ornithine decarboxylase Variable production(ODC) Citrate utilization (CIT) -- H2S production(H2S) -- Urease production(URE) -- Tryptophane deaminase -- production (TDA) Indole production(IND) Variable Acetoin production(VP) -- Gelatinase production(CEL) Variable Acid from glucose(GLU) Variable Acid from manitol(MAN) Variable Acid from inositol(INO) -- Acid from Sorbitol(SOR) -- Acid from rhamnose(RHA) -- Acid from sucrose(SAC) -- Acid from melibiose(MEL) -- Acid from amygdalin (AMY) + Acid from arabinose (ARA) -- Cytochrome oxidase (OX) +
Most valuable are the following essential amino acids: valine, lysine, tryptophane, etc [3].
indoles, tryptophane metabolites, bilirubin, and oxidised products of lipid metabolism have been suggested as nontoxic ligands-activators or ligands-inhibitors of AhR expression by competitive and noncompetitive pathways [181,182].
The inflammatory mediators seem to activate the widespread tryptophane catabolizing enzyme indoleamine 2,3-deoxygenase (IDO) leading to decreased synthesis of 5-HT.
Conventional assays based on UV-Vis spectroscopy rely on absorbance by tryptophane and tyrosine residues with minor contribution from cysteine, and therefore have limited utility.
The World Health Organization established a model or ideal balance of the essential amino acids (isoleucine, leucine, lysine, methionine, cysteine, phenylalanine, tyrosine, threonine, tryptophane, and valine) in terms of milligrams of amino acid per gram of protein.
Deux polymorphismes genetiques ont ete significativement associes au risque de tentative de suicide : polymorphismes introniques (A218C ou A779C) du gene de la tryptophane hydroxylase 1 (TPH1), l'enzyme limitante de la synthese de la serotonine, et polymorphisme insertion/deletion du gene du transporteur de la serotonine (5-HTTLPR) (Bondy et al.