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Carboxylic acids, upon heating, undergo a decarboxylation reaction by releasing carbon dioxide gas. Monocarboxylic acids do not undergo decarboxylation easily. However, a silver salt of carboxylic acid reacts with bromine or iodine under high temperature to release carbon dioxide gas and forms halide with one less carbon. This reaction is called the Hunsdiecker reaction.
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Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
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Light-driven Enzymatic Decarboxylation
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Structural insights into UbiD reversible decarboxylation.

George W Roberts1, David Leys1

  • 1Manchester Institute of Biotechnology, Department of Chemistry, University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK.

Current Opinion in Structural Biology
|July 17, 2022
PubMed
Summary
This summary is machine-generated.

The UbiX-UbiD system

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Area of Science:

  • Microbial biochemistry
  • Enzymology
  • Structural biology

Background:

  • The UbiX-UbiD system catalyzes microbial decarboxylation reactions.
  • Recent crystallographic studies illuminate the mechanism of α,β-unsaturated acid conversion.
  • UbiD utilizes prenylated flavin (prFMN), synthesized by UbiX flavin prenyltransferase.

Purpose of the Study:

  • Elucidate the mechanism of the UbiX-UbiD system.
  • Characterize the structural diversity and substrate versatility of the UbiD superfamily.
  • Explore potential biotechnological applications of UbiD enzymes.

Main Methods:

  • X-ray crystallography to determine UbiX/UbiD structures.
  • Biochemical assays to study enzyme mechanisms.
  • Directed evolution to engineer UbiD variants.

Main Results:

  • Revealed a conserved mechanism for prFMN synthesis and (de)carboxylation.
  • Demonstrated UbiD's broad substrate range, reflected in diverse structures and active sites.
  • Engineered UbiD variants for in vivo hydrocarbon production and CO2 fixation.

Conclusions:

  • The UbiX-UbiD system employs a conserved mechanism for cofactor synthesis and substrate conversion.
  • UbiD's structural and functional plasticity enables diverse applications, including biocatalysis and synthetic biology.
  • Further research can leverage UbiD's versatility for novel industrial processes.