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Related Experiment Video

Updated: Oct 23, 2025

Light-driven Enzymatic Decarboxylation

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

UbiD domain dynamics underpins aromatic decarboxylation.

Stephen A Marshall^1,2, Karl A P Payne³, Karl Fisher³

¹Manchester Institute of Biotechnology, University of Manchester, Manchester, UK. stephen.marshall@chem.ox.ac.uk.

Nature Communications

|August 21, 2021

Summary

UbiD enzymes use prFMN cofactor for reversible decarboxylation. Enzyme dynamics, specifically domain motion in vanillic acid decarboxylase, are crucial for aromatic compound rearrangement during catalysis.

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Area of Science:

Biochemistry
Enzymology
Structural Biology

Background:

The UbiD enzyme family catalyzes reversible decarboxylation of various compounds using the prFMN cofactor.
Acrylic compound decarboxylation involves 1,3-dipolar cycloaddition, while aromatic acid decarboxylation presents a significant molecular dynamic challenge due to substrate rearrangement.

Purpose of the Study:

To elucidate the structural and dynamic mechanisms underlying aromatic acid decarboxylation by the UbiD-like vanillic acid decarboxylase (VdcCD).
To investigate the role of the VdcD subunit in activating VdcC and its influence on the enzyme's active site.

Main Methods:

Determination of crystal structures of the multi-subunit vanillic acid decarboxylase VdcCD complex.
Analysis of domain motion within the prFMN-binding domain and its effect on active site architecture.
Molecular docking of substrate and prFMN-adduct species to understand active site reorganisation.
Kinetic studies including solvent viscosity effects.

Main Results:

The small VdcD subunit acts as an allosteric activator for the UbiD-like VdcC subunit.
Distinct VdcCD structures reveal domain motion in the prFMN-binding domain directly impacts active site conformation.
Active site reorganisation, coupled with domain motion, facilitates the rearrangement of the aromatic moiety of the substrate.
Kinetic data supports the role of enzyme dynamics in prFMN-mediated covalent catalysis.

Conclusions:

The study establishes that UbiD enzyme dynamics, particularly domain motion, are essential for the covalent catalysis of aromatic (de)carboxylation.
The VdcD subunit's allosteric activation of VdcC and associated domain movements are key to accommodating substrate rearrangement during aromatic decarboxylation.