Tryptophan Biochemistry: Structural, Nutritional, Metabolic, and Medical Aspects in Humans.

Area of Science:

• Biochemistry
• Human Physiology
• Molecular Biology

Background:

• L-Tryptophan (Trp) is a unique protein amino acid with an indole ring.
• Its derivatives have pleiotropic effects on homeostasis and are involved in synthesizing key molecules like serotonin (5-HT) and melatonin (MLT).
• The breakdown of Trp's indole ring via the kynurenine shunt produces important cellular compounds, including nicotinamide adenine dinucleotide (NAD+).

Purpose of the Study:

• To map the molecular effectors in human tryptophan research.
• To explore Trp's chemistry, distribution, nutritional value, and protein-mediated uptake/biotransformation.
• To highlight Trp biochemistry's role in complex diseases, particularly those involving the gut, neuroimmunoendocrine system, and central nervous system (CNS).

Main Methods:

• Literature review focusing on tryptophan's chemical properties and biological pathways.
• Analysis of Trp's role in human nutrition and tissue-specific biotransformation.
• Examination of Trp's involvement in disease pathogenesis, advocating for -Omics approaches.

Main Results:

• Tryptophan biotransformation generates diverse bioactive molecules, influencing cellular processes.
• Key human pathways involving Trp derivatives include synthesis of serotonin, melatonin, and NAD+.
• Trp biochemistry is implicated in the pathogenesis of complex diseases affecting the gut, neuroimmunoendocrine system, and CNS.

Conclusions:

• Understanding tryptophan's biochemistry is essential for comprehending human health and disease.
• The kynurenine shunt and Trp derivatives play critical roles in homeostasis and disease.
• -Omics approaches are valuable for advancing research in human tryptophan biology and its associated pathologies.