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Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

Phase II Reactions: Sulfation and Conjugation with α-Amino Acids

Phase II Reactions: Sulfation and Conjugation with α-Amino Acids

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 activation, sulfur...

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

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...

Drug Metabolism: Phase II Reactions

Drug Metabolism: Phase II Reactions

Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation

Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
Several distinctive characteristics distinguish glutathione conjugation from other phase II...

Phase II Reactions: Glucuronidation

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Glucuronidation, a pivotal phase II biotransformation process, involves the coupling of glucuronic acid to a drug or xenobiotic. Given its widespread occurrence and critical role in drug metabolism, it's considered the most crucial phase II reaction. It enhances the water solubility of substances, aiding their expulsion from the body. The driving force behind these reactions is a group of enzymes known as UDP-glucuronosyltransferases (UGTs). UGTs facilitate the transfer of a glucuronic acid...

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Extremely Rapid and Specific Metabolic Labelling of RNA In Vivo with 4-Thiouracil (Ers4tU)

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Sulfotransferase 4A1.

Rodney F Minchin¹, Aaron Lewis, Deanne Mitchell

¹School of Biomedical Sciences, University of Queensland, Brisbane, Queensland, Australia. r.minchin@uq.edu.au

The International Journal of Biochemistry & Cell Biology

|February 6, 2008

Summary

This summary is machine-generated.

This review covers the novel human sulfotransferase, SULT4A1, focusing on its properties and brain expression. Its link to schizophrenia highlights the need to understand its function and potential role in disease.

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Area of Science:

Biochemistry
Neuroscience
Genetics

Background:

The novel human sulfotransferase, SULT4A1, is primarily expressed in specific brain regions.
Its precise endogenous substrate and function remain unidentified.
SULT4A1 exhibits low homology but structural similarity to other cytosolic sulfotransferases.

Purpose of the Study:

To review the physical and enzymatic properties of SULT4A1.
To explore the potential role of SULT4A1 in human disease, particularly schizophrenia.

Main Methods:

Structural analysis comparing SULT4A1 to other sulfotransferases.
Review of gene expression data highlighting brain localization.
Examination of recent genetic association studies linking SULT4A1 to schizophrenia.

Main Results:

SULT4A1 possesses a conserved substrate binding domain and dimerization site, but a smaller catalytic cavity.
The enzyme is highly conserved across species despite low homology with other human sulfotransferases.
Variability in the SULT4A1 gene's 5'UTR has been associated with schizophrenia.

Conclusions:

SULT4A1's unique structural features may influence its enzymatic activity and substrate specificity.
The enzyme's conservation and brain-specific expression suggest a significant biological role.
Further research into SULT4A1 is warranted due to its potential implications in neurological disorders like schizophrenia.