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SIRT4 is a mitochondrial ADP-ribosyltransferase that inhibits mitochondrial glutamate dehydrogenase 1 activity, thereby downregulating insulin secretion in response to amino acids. [7] A deacetylation of malonyl-CoA decarboxylase enzyme by SIRT4 represses the enzyme activity, inhibiting fatty acid oxidation in muscle and liver cells.
Beta cells secrete insulin in response to an increase in the ATP:ADP ratio, and, as amino acids are broken down by GLDH into α-ketoglutarate, this ratio rises and more insulin is secreted. SIRT4 is necessary to regulate the metabolism of amino acids as a method of controlling insulin secretion and regulating blood glucose levels.
All amatoxins are cyclic peptides that are synthesized as 35-amino-acid proproteins, from which the final eight amino acids are cleaved by a prolyl oligopeptidase. [3] The schematic amino acid sequence of amatoxins is Ile-Trp-Gly-Ile-Gly-Cys-Asn-Pro with cross-linking between Trp and Cys via the sulfoxide (S=O) moiety and hydroxylation in ...
l-Kynurenine is a metabolite of the amino acid l-tryptophan used in the production of niacin. Kynurenine is synthesized by the enzyme tryptophan dioxygenase , which is made primarily but not exclusively in the liver, and indoleamine 2,3-dioxygenase , which is made in many tissues in response to immune activation. [ 1 ]
Serine (symbol Ser or S) [3] [4] is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated − NH +3 form under biological conditions), a carboxyl group (which is in the deprotonated − COO −
In renal aminoaciduria, the renal tubules are unable to reabsorb the filtered amino acids back into the blood, causing high concentrations of amino acids in the urine. [5] This may be caused by a defect in the transport proteins in the renal tubule, for example, as occurs in Hartnup disease , [ 5 ] or may be due to damage to the kidney tubule ...
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Cycloleucine is a non-proteinogenic amino acid. It could be classified as a cyclopentane derivative of norleucine, having two hydrogen atoms less. The α-carbon atom is not a stereocenter. Cycloleucine is a non-metabolisable amino acid that specifically and reversibly inhibits nucleic acid methylation. It is widely used in biochemical ...