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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
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Methyl transfer in psilocybin biosynthesis.

Jesse Hudspeth1,2, Kai Rogge3,4, Sebastian Dörner3,4

  • 1Institute of Genetic Epidemiology, Medical University of Innsbruck, Innsbruck, Austria.

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|March 29, 2024
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Summary
This summary is machine-generated.

This study reveals the atomic structure of PsiM, an enzyme crucial for psilocybin biosynthesis. Understanding this mechanism aids in developing new psilocybin-based therapeutics for mental health conditions.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Pharmacology

Background:

  • Psilocybin, a compound from "magic" mushrooms, shows potential for treating mental health disorders.
  • The enzyme PsiM catalyzes the final dimethylation step in psilocybin biosynthesis.

Purpose of the Study:

  • To elucidate the atomic resolution structure of PsiM.
  • To understand the SAM-dependent methylation mechanism of PsiM.
  • To explore the evolutionary origins and limitations of PsiM.

Main Methods:

  • X-ray crystallography at 0.9 Å resolution.
  • Structural and phylogenetic analyses.
  • Substrate binding analysis.

Main Results:

  • Atomic structures of PsiM captured during its reaction cycle.
  • Detailed insights into the SAM-dependent methylation mechanism.
  • PsiM shares ancestry with epitranscriptomic N⁶-methyladenosine writers (METTL16 family).
  • Bound substrates mimic RNA, suggesting evolutionary links.

Conclusions:

  • The study provides a mechanistic understanding of PsiM.
  • Inherent limitations of PsiM's scaffold restrict psilocybin production efficiency.
  • Findings will guide bioengineering efforts for improved psilocybin analogs.