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Related Concept Videos

Peroxisomes01:24

Peroxisomes

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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...
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Oxidation of Phenols to Quinones01:17

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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...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

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Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Updated: Feb 17, 2026

Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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Substrates for Paraoxonase.

Xiaojing Mu1, Xiaoqi Yi1, Shangyou Xiao1

  • 1Department of Pharmaceutical Engineering, College of Chemistry & Chemical Engineering, Chongqing University, Chongqing, 401331, China.

Current Pharmaceutical Design
|December 15, 2017
PubMed
Summary
This summary is machine-generated.

Paraoxonase (PON) substrates are classified by structure, revealing insights into enzyme activity. Understanding these substrates is key for developing PON-based drugs and diagnostic tools for various diseases.

Keywords:
Paraoxonasearylestercatalytic efficiencylactonesorganic phosphorous estersphenotypespolymorphismsubstrates.

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Area of Science:

  • Biochemistry
  • Enzymology

Background:

  • Paraoxonase (PON) enzymes are calcium-dependent hydrolases implicated in numerous diseases.
  • Understanding PON substrates is crucial for elucidating their physiological roles and medical applications.

Purpose of the Study:

  • To collect and classify reported PON substrates from existing literature.
  • To provide insights for drug design and diagnosis of PON status.

Main Methods:

  • Systematic review and classification of PON substrates from 133 references.
  • Structural categorization into organic phosphorous esters, lactones, and arylesters, with inclusion of other related compounds.

Main Results:

  • PON substrates exhibit diverse structures including esters, lactones, and phosphoramidates.
  • Substituent properties (electronic nature, sterics, hydrophilicity) influence PON catalytic and binding abilities.
  • Specific substrates differentiate PON1 allozymes and are hydrolyzed stereoselectively, indicating enzyme specificity.

Conclusions:

  • Further characterization of PON substrates will illuminate PON structure, active center, and catalytic mechanisms.
  • This knowledge will facilitate the development of PON as a therapeutic target and disease biomarker.