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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

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Protein-Protein Interactions Modulate a Key Branch Point in Monoterpene Indole Alkaloid Biosynthesis.

Samuel C Carr¹, Allwin McDonald¹, Chloe Langley¹

¹Department of Natural Product Biosynthesis, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany.

ACS Chemical Biology

|January 4, 2026

Summary

This summary is machine-generated.

Protein-protein interactions (PPIs) regulate specialized metabolite production in plants. This study identified key interactions in the Catharanthus roseus alkaloid pathway, revealing how they control metabolic flux and product distribution.

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Identification of Post-translational Modifications of Plant Protein Complexes

Identification of Post-translational Modifications of Plant Protein Complexes

Published on: February 22, 2014

Area of Science:

Biochemistry
Plant Science
Metabolic Engineering

Background:

Specialized metabolite biosynthesis relies on protein-protein interactions (PPIs) for efficiency.
Metabolic pathways, like that of monoterpene indole alkaloids in Catharanthus roseus, feature branch points potentially regulated by transient PPIs.

Purpose of the Study:

To investigate transient PPIs at a specific branch point in the Catharanthus roseus monoterpene indole alkaloid pathway.
To understand how these PPIs influence the conversion of dehydrosecodine into downstream alkaloid scaffolds.

Main Methods:

Verified known reductase-cyclase PPIs and identified novel interactions between related protein homologues.
Performed structural analysis of dehydrosecodine cyclases to pinpoint interaction-mediating surface residues.
Utilized in vitro competition assays to assess the impact of identified residues on product distribution.

Main Results:

Confirmed existing PPIs and discovered new interactions involving homologous proteins.
Identified specific surface residues on dehydrosecodine cyclases crucial for reductase interaction.
Demonstrated that these residues modulate the distribution of downstream metabolic products.

Conclusions:

Transient PPIs are significant regulators of specialized metabolite pathway flux.
Understanding these interactions offers insights into controlling the production of valuable plant-derived compounds like vinblastine.