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Melatonin, a neurohormone, interacts with over 15 proteins, including receptors and enzymes. This review evaluates the evidence for these melatonin targets, assessing their scientific validity and physiological relevance.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neuroendocrinology

Background:

  • Melatonin (N-acetyl-5-methoxytryptamine) is a neurohormone derived from tryptophan with diverse biological functions.
  • Melatonin's effects are attributed to its radical scavenging properties or binding to specific protein targets.
  • Over 15 distinct protein targets, including receptors, enzymes, transporters, and structural proteins, have been implicated in melatonin interactions.

Purpose of the Study:

  • To compile and critically review all proposed melatonin-binding proteins.
  • To assess the robustness of findings regarding melatonin-protein interactions based on methodology, physiological relevance, and independent replication.

Main Methods:

  • Comprehensive literature search for studies reporting melatonin-protein interactions.
  • Critical analysis of experimental methodologies used to identify and validate these interactions.
  • Evaluation of physiological relevance and independent replication of reported findings.

Main Results:

  • A wide array of proteins, including MT1, MT2, Mel1c, ROR, VDR, QR2, MMP-9, pepsin, PP2A, PEPT1/2, Glut1, and others, have been proposed as melatonin targets.
  • Melatonin concentrations involved in these interactions range from sub-nanomolar to millimolar.
  • The review identifies variability in the strength of evidence supporting different proposed melatonin targets.

Conclusions:

  • The diverse proposed targets highlight the multifaceted biological roles of melatonin.
  • Further rigorous research is needed to confirm the physiological significance of many identified melatonin-protein interactions.
  • This review provides a foundational resource for understanding the complex molecular landscape of melatonin signaling.