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Phase II Reactions: Acetylation Reactions01:24

Phase II Reactions: Acetylation Reactions

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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.
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Phase II Reactions: Sulfation and Conjugation with α-Amino Acids01:19

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Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme...
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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
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Amines to Amides: Acylation of Amines01:19

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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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Introduction
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Refining S-acylation: Structure, regulation, dynamics, and therapeutic implications.

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Protein lipidation, especially reversible S-acylation, creates cellular diversity. Understanding S-acylation enzymes and their role in disease is crucial for future research.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Cells utilize post-translational modifications to generate diversity from a limited gene set.
  • Lipid modifications, such as S-acylation, confer hydrophobicity and are crucial for cellular processes.
  • S-acylation is the only reversible lipid modification, playing a significant role in various cellular pathways.

Purpose of the Study:

  • To review the current understanding of enzymes regulating S-acylation (protein lipidation).
  • To explore the structure, regulation, and influence of S-acylation on target proteins.
  • To discuss the potential contribution of S-acylation/deacylation imbalance to disease.

Main Methods:

  • Literature review of S-acylation and deacylation enzymes.
  • Analysis of protein structure and function in relation to lipid modification.
  • Exploration of the physiological and pathological roles of S-acylation.

Main Results:

  • The enzymes governing S-acylation and deacylation are increasingly identified.
  • A growing number of proteins are found to undergo S-acylation.
  • S-acylation significantly impacts protein function and cellular pathways.

Conclusions:

  • The enzymes regulating S-acylation are key to cellular function and diversity.
  • Dysregulation of the S-acylation/deacylation balance is implicated in various diseases.
  • Further research into S-acylation enzymes and their roles is warranted.