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C–C Bond Cleavage: Retro-Aldol Reaction

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The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
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Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond and two π bonds — is completely cleaved, and the alkyne is oxidized to carboxylic acids. When warm and basic aqueous potassium permanganate is used as an oxidizing agent, alkynes are first converted to carboxylate salts via an unstable α-diketone intermediate. Further, a mild acid treatment protonates the carboxylate anions...

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A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...

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Related Experiment Video

Updated: Aug 3, 2025

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System

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Published on: August 8, 2016

Engineering C-C Bond Cleavage Activity into a P450 Monooxygenase Enzyme.

Justin C Miller¹, Joel H Z Lee², Mark A Mclean³

¹Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society

|April 12, 2023

Summary

Researchers engineered a microbial cytochrome P450 (CYP) enzyme to cleave carbon-carbon bonds in α-hydroxy ketones. This engineered CYP enzyme exhibits lyase activity, offering new insights into CYP catalytic mechanisms and intermediates.

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Area of Science:

Biochemistry
Enzymology
Microbial Biotechnology

Background:

Cytochrome P450 (CYP) enzymes are versatile heme monooxygenases catalyzing diverse reactions, including carbon-carbon bond cleavage (lyase activity).
Understanding the detailed mechanisms of CYP-mediated C-C bond cleavage is crucial for enzyme engineering and drug metabolism studies.

Purpose of the Study:

To investigate the carbon-carbon cleavage reaction of α-hydroxy ketones in mechanistic detail using a microbial P450.
To engineer and characterize a CYP enzyme for efficient lyase activity on α-hydroxy ketone substrates.

Main Methods:

Synthesis of α-hydroxy ketone probes based on a benzoic acid metabolizing P450 substrate.
Enzyme assays with wild-type and mutant CYP199A4 (F182L) to assess C-C bond cleavage activity.
Kinetic solvent isotope effect studies, co-crystallization, and molecular dynamics simulations.

Main Results:

An F182L mutant of CYP199A4 demonstrated enzyme-dependent C-C bond cleavage of an α-hydroxy ketone.
The reaction exhibited an inverse kinetic solvent isotope effect, suggesting early catalytic intermediates.
Structural and simulation data revealed substrate binding and positioning conducive to lyase activity, mimicking CYP17A1.

Conclusions:

Engineered microbial CYP systems can achieve lyase activity on α-hydroxy ketones.
The observed inverse solvent isotope effect provides mechanistic insights into CYP catalytic cycles.
This work facilitates further biophysical and structural studies of CYP catalytic intermediates.