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Acetylcysteine is the N-acetyl derivative of the amino acid L-cysteine, and is a precursor in the formation of the antioxidant glutathione in the body. The thiol (sulfhydryl) group confers antioxidant effects and is able to reduce free radicals .
Acetyl-CoA is an intermediate in the biological synthesis and in the breakdown of many organic molecules. Acetyl-CoA is also created during the second stage of cellular respiration (pyruvate decarboxylation) by the action of pyruvate dehydrogenase on pyruvic acid. [8] Proteins are often modified via acetylation, for various purposes.
N-Acetylglucosamine (GlcNAc) is an amide derivative of the monosaccharide glucose. It is a secondary amide between glucosamine and acetic acid . It is significant in several biological systems.
N-Acetylgalactosamine is necessary for intercellular communication, and is concentrated in sensory nerve structures of both humans and animals. GalNAc is also used as a targeting ligand in investigational antisense oligonucleotides and siRNA therapies targeted to the liver, where it binds to the asialoglycoprotein receptors on hepatocytes .
NAPQI, also known as NAPBQI or N-acetyl-p-benzoquinone imine, is a toxic byproduct produced during the xenobiotic metabolism of the analgesic paracetamol (acetaminophen). [1] It is normally produced only in small amounts, and then almost immediately detoxified in the liver.
N-Acetylglutamate synthase is an enzyme that serves as a replenisher of N-acetylglutamic acid to supplement any N-acetylglutamic acid lost by the cell through mitosis or degradation. NAGS synthesizes N-acetylglutamic acid by catalyzing the addition of an acetyl group from acetyl-coenzyme A to glutamate.