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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...

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...

ATP Synthase: Structure

ATP Synthase: Structure

ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...

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...

ATP Synthase: Mechanism

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...

Protein Modifications in the RER

Protein Modifications in the RER

Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases

Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases

Published on: October 10, 2020

Structure, function and polymorphism of human cytosolic sulfotransferases.

Julian Lindsay¹, Lin-Lin Wang, Yong Li

¹Division of Pharmacy, School of Life Sciences, Queensland University of Technology, Brisbane, Australia.

Current Drug Metabolism

|February 22, 2008

Summary

Sulfotransferase (SULT) enzymes play a key role in drug and hormone metabolism. This review details the SULT enzyme families, their structures, and substrates, highlighting their clinical significance in disease and drug development.

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Area of Science:

Biochemistry
Pharmacology
Molecular Biology

Background:

Sulfotransferase (SULT) enzymes catalyze the sulfonation of xenobiotics, hormones, and neurotransmitters.
Hepatic sulfonation is a crucial Phase II metabolic process for enhancing hydrophilicity and facilitating excretion.
Thirteen human cytosolic SULT genes across four families (SULT1, SULT2, SULT4, SULT6) have been identified.

Purpose of the Study:

To provide a comprehensive review of the SULT enzyme family.
To detail the structure, substrate specificity, and known functions of different SULT groups.
To explore the clinical relevance and potential future applications of SULT research.

Main Methods:

Literature review summarizing existing research on SULT enzymes.
Analysis of established enzyme structures and their implications for reaction mechanisms.
Compilation of known substrates and functional roles for SULT families.

Main Results:

Detailed characterization of SULT1 (phenols, hormones, xenobiotics) and SULT2 (steroids) families.
Identification of SULT1A1 allele variations across different ethnic groups.
Observation of substrate inhibition and varying maximum velocities (Vmax) across SULT families.

Conclusions:

Further understanding of SULT enzymes and Phase II metabolism offers significant clinical benefits.
Emerging links between sulfonation, cancer, and other diseases underscore the importance of SULT research.
SULT research holds promise for advancing clinical practice and therapeutic strategies.