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Yes, tryptophan indirectly has a role in making you feel sleepy. But that doesn't mean turkey is the primary culprit when you hit a post-Thanksgiving slump. The real reason is much more complicated.
The Real Reason Why Turkey Makes You So Sleepy. Holiday staples include delicious foods like honey-baked ham, roasted beef tenderloin, and one of the most iconic holiday foods of them all: turkey.
Tryptophan contains an α-amino group, an α-carboxylic acid group, and a side chain indole, making it a polar molecule with a non-polar aromatic beta carbon substituent. Tryptophan is also a precursor to the neurotransmitter serotonin, the hormone melatonin, and vitamin B 3 (niacin). [4] It is encoded by the codon UGG.
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Tryptophan 2,3-dioxygenase plays a central role in the physiological regulation of tryptophan flux in the human body, as part of the overall biological process of tryptophan metabolism. TDO catalyses the first and rate-limiting step of tryptophan degradation along the kynurenine pathway and thereby regulates systemic tryptophan levels. [5]
Structure of the trp operon. The trp operon is a group of genes that are transcribed together, encoding the enzymes that produce the amino acid tryptophan in bacteria. The trp operon was first characterized in Escherichia coli, and it has since been discovered in many other bacteria. [1]
Acute tryptophan depletion (ATD) is a technique used extensively to study the effect of low serotonin in the brain. [1] This experimental approach reduces the availability of tryptophan , an amino acid which serves as the precursor to serotonin.
5-HTP is produced from the amino acid tryptophan through the action of the enzyme tryptophan hydroxylase. Tryptophan hydroxylase is one of the biopterin-dependent aromatic amino acid hydroxylases. Production of 5-HTP is the rate-limiting step in 5-HT (serotonin) synthesis. 5-HTP is normally rapidly converted to 5-HT by amino acid decarboxylase. [1]