Related Experiment Video
Updated: Apr 15, 2026
08:31
Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
Published on: October 3, 2018
9.1K
Steroid hydroxylation by basidiomycete peroxygenases: a combined experimental and computational study
Esteban D Babot1, José C Del Río1, Marina Cañellas2
1Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Seville, Spain.
Applied and Environmental Microbiology
|April 12, 2015
Summary
Fungal peroxygenases selectively hydroxylate steroids, primarily at the side chain, yielding 25-hydroxyderivatives. Computational studies explain enzyme selectivity based on active-site geometry and steroid structure.
Area of Science:
- Biocatalysis
- Enzymology
- Computational Chemistry
Background:
- Steroid oxyfunctionalization is crucial for synthesizing bioactive compounds.
- Current methods often require harsh conditions, limiting environmental friendliness.
- Fungal enzymes offer a promising alternative for selective and green chemical transformations.
Purpose of the Study:
- To investigate the selective oxyfunctionalization of diverse steroids using fungal peroxygenases.
- To explore mild and environmentally friendly enzymatic hydroxylation of steroidal compounds.
- To elucidate the factors governing enzyme selectivity and reaction yields through computational analysis.
Main Methods:
- Screening of peroxygenases from three basidiomycete species (Agrocybe aegerita, Marasmius rotula, Coprinopsis cinerea) for steroid hydroxylation.
- Enzymatic reactions using H2O2 as the sole cosubstrate on various steroidal substrates.
- Analysis of reaction products using gas chromatography and mass spectrometry.
- Computational modeling using Protein Energy Landscape Exploration (PELE) to study enzyme-substrate interactions.
Main Results:
- Fungal peroxygenases efficiently hydroxylated a range of steroids, with a preference for side-chain hydroxylation, predominantly yielding 25-hydroxyderivatives.
- Hydroxylation within the steroidal ring and terminal side-chain hydroxylation were observed under specific conditions.
- Computational simulations revealed that active-site geometry and hydrophobicity favor steroid side-chain entry, explaining observed reaction yields and selectivities.
Conclusions:
- Fungal peroxygenases are effective biocatalysts for selective steroid hydroxylation under mild conditions.
- The regioselectivity of hydroxylation is influenced by steroid structure and enzyme active-site characteristics.
- Computational modeling provides valuable insights into enzyme mechanisms and can predict catalytic outcomes for steroid biotransformations.
Related Concept Videos
03:08Hydroboration-Oxidation of Alkenes
12.6K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
12.6K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
13.7K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
13.7K
01:24Peroxisomes
22.2K
Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
22.2K
01:24Peroxisomes
2.0K
2.0K
02:23Autoxidation of Ethers to Peroxides and Hydroperoxides
10.2K
Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.
10.2K
01:17Oxidation of Phenols to Quinones
5.4K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
5.4K