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Structural basis for psilocybin biosynthesis.

Chunyan Meng1,2, Wenting Guo1, Chuan Xiao1

  • 1Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Guangdong-Hong Kong Joint Laboratory for RNA Medicine, Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.

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|March 23, 2025
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This summary is machine-generated.

This study reveals the crystal structures of key enzymes in psilocybin biosynthesis, uncovering mechanisms for efficient production. Biosynthetic intermediates also demonstrate antidepressant properties, highlighting psilocybin

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Neuroscience

Background:

  • Psilocybin shows therapeutic promise for psychiatric conditions via psilocybin-assisted psychotherapy.
  • Biosynthesis offers a rapid and efficient method for psilocybin production.
  • Understanding biosynthetic enzymes is crucial for optimizing psilocybin production.

Purpose of the Study:

  • To elucidate the crystal structures of key enzymes (PsiD, PsiK, PsiM) involved in psilocybin biosynthesis.
  • To understand the catalytic mechanisms and regulatory features of these enzymes.
  • To evaluate the antidepressant potential of psilocybin biosynthetic intermediates.

Main Methods:

  • Crystallography was used to determine the structures of L-tryptophan-specific decarboxylase (PsiD), 4-hydroxytryptamine kinase (PsiK), and methyltransferase (PsiM).
  • Structure-based analysis was performed to understand enzyme mechanisms.
  • Antidepressant properties were assessed in female mice using behavioral models of depression.

Main Results:

  • Crystal structures of PsiD (apo and tryptamine-bound), PsiK (substrate-bound), and PsiM (apo and substrate-bound) were determined.
  • Mechanisms of PsiD self-cleavage and self-inhibition were revealed, alongside sequential catalytic steps in psilocybin formation.
  • Psilocybin biosynthetic intermediates exhibited antidepressant effects in a mouse model of depression.

Conclusions:

  • Structural insights provide a basis for enhancing enzymatic psilocybin biosynthesis.
  • The study highlights the clinical potential of norbaeocystin and other biosynthetic intermediates.
  • This work bridges structural enzymology with the therapeutic applications of psilocybin.