tryptophan 2,3-dioxygenase

tryp·to·phan 2,3-di·ox·y·gen·ase

an oxidoreductase catalyzing the reaction of l-tryptophan and O2 to produce l-N-formylkynurenine; an adaptive enzyme, the level (in the liver) being controlled by adrenal hormones; a step in tryptophan catabolism; also, a step in the synthesis of NAD+ from tryptophan.
Synonym(s): pyrrolase, tryptophan oxygenase, tryptophan pyrrolase, tryptophanase (1)

tryp·to·phan 2,3-di·ox·y·gen·ase

(trip'tŏ-fan dī-oks'ĕ-jĕn-ās)
An oxidoreductase catalyzing the reaction of l-tryptophan and O2 to produce l-N-formylkynurenine; an adaptive enzyme, the level (in the liver) being controlled by adrenal hormones; a step in tryptophan catabolism; also, a step in the synthesis of NAD+ from tryptophan.
Synonym(s): tryptophanase (1) .
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References in periodicals archive ?
Abstract: Tryptophan 2,3-dioxygenase (TDO) exist only in liver while indoleamine 2, 3-dioxygenase (IDO) exists ubiquitously in the body, these are the most rate-limiting enzymes of kynurenine pathway (KP).
Keywords: Dicolfenac sodium, tryptophan, kynurenine, indoleamine 2,3-dioxygenase, tryptophan 2,3-dioxygenase.
iTeos Therapeutics has formed a strategic collaboration with Pfizer as per which iTeos is to license to Pfizer rights to iTeos' pre-clinical compounds targeting Indoleamine 2,3-dioxygenase (IDO1) and Tryptophan 2,3-dioxygenase (TDO2).
According to the contract, iTeos will license to Pfizer rights to iTeos' pre-clinical compounds targeting Indoleamine 2,3-dioxygenase (IDO1) and Tryptophan 2,3-dioxygenase (TDO2), while Pfizer will be responsible for the development and commercialisation of IDO1 and TDO2 drug candidates.
The first and rate limiting step of the tryptophan catabolism in mammals is regulated by the enzymes tryptophan 2,3-dioxygenase (TDO) and indoleamine 2,3-dioxygenase (IDO), which catalyze the conversion of tryptophan to N-formyl kynurenine.
Cirrhotic liver disease patients present with reduced activity of tryptophan 2,3-dioxygenase (22%), with subsequent increased free tryptophan and half-life, and decreased clearance.
Biochemical mechanisms leading to tryptophan 2,3-dioxygenase activation.
In the kynurenine pathway, tryptophan can be catabolized either by indoleamine 2,3-dioxygenase, which is activated by type 1 cytokines, or by tryptophan 2,3-dioxygenase.
With the switch from Th1 to Th2 immune response in schizophrenia, indoleamine 2,3-dioxygenase is inhibited while tryptophan 2,3-dioxygenase is overexpressed.
Tryptophan 2,3-dioxygenase is located primarily in the liver, and its activity is up-regulated in response to Trp and metabolic steroids.