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Phase II Reactions: Acetylation Reactions

Phase II Reactions: Acetylation Reactions

Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
The substrates for acetylation are typically drugs or their metabolites with an amino, sulfonamide, or hydrazine functional group. Acetylation can occur at several points in the drug molecule, including primary, secondary, and...

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Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...

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Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...

Basicity of Aromatic Amines

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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...

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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.

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A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging

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Arylamine N-acetyltransferases: structural and functional implications of polymorphisms.

Edith Sim¹, Nathan Lack, Chan-Ju Wang

¹Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, United Kingdom.

|October 15, 2008

Summary

Arylamine N-acetyltransferases (NATs) are crucial enzymes with distinct human isoenzymes NAT1 and NAT2. Polymorphisms in NAT2 affect drug metabolism, increasing toxicity risk for slow acetylators.

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Published on: November 23, 2016

Area of Science:

Biochemistry
Pharmacogenetics
Molecular Biology

Background:

Arylamine N-acetyltransferases (NATs) catalyze essential acetylation reactions.
NATs represent early examples of pharmacogenetic variation, particularly in drug metabolism.
Human genetics include two polymorphic NAT genes (NAT1, NAT2) and a pseudogene (NATP).

Purpose of the Study:

To review recent advances and highlight the excitement in Arylamine N-acetyltransferase (NAT) research.
To discuss the structure, function, and polymorphism of human NAT1 and NAT2 isoenzymes.
To explore the implications of NAT polymorphisms on drug efficacy and toxicity.

Main Methods:

Bioinformatics analyses to identify NAT homologues in zebrafish.
Crystallographic studies of NATs from Salmonella typhimurium and mycobacteria to elucidate mechanism and binding sites.
NMR and crystallographic studies of eukaryotic NAT enzymes to understand substrate specificities.

Main Results:

The catalytic mechanism of acetyl transfer via a conserved catalytic triad (Cys, His, Asp) was identified.
Substrate binding sites and acetyl-CoA binding pockets were characterized.
Distinct substrate specificities for human NAT1 (e.g., 5-aminosalicylate) and NAT2 (e.g., sulfamethazine) were elucidated.
Single Nucleotide Polymorphisms (SNPs) in NAT2 can lead to unstable proteins, causing intracellular aggregation and degradation, characteristic of slow acetylators.

Conclusions:

NAT polymorphisms, especially in NAT2, significantly impact drug inactivation and toxicity.
Slow acetylators are at higher risk for adverse drug reactions, including isoniazid neurotoxicity and hydralazine-induced lupus.
Understanding NAT structure-function relationships is crucial for personalized medicine and drug development.