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Lysine (symbol Lys or K) [2] is an α-amino acid that is a precursor to many proteins.It contains an α-amino group (which is in the protonated −NH + 3 form when dissolved in water), an α-carboxylic acid group (which is in the deprotonated −COO − form when dissolved in water), and a side chain lysyl ((CH 2) 4 NH 2), classifying it as a basic, charged (at physiological pH), aliphatic ...
This pathway is a part of the glutamate family of amino acid biosynthetic pathways. [2] The reaction steps in the pathway are similar to the citric acid cycle. The first step in the pathway is condensation of acetyl-CoA with α-ketoglutarate, which gives homocitrate. This reaction is catalyzed by homocitrate synthase.
Amino acid biosynthesis is the set of biochemical processes (metabolic pathways) by which the amino acids are produced. The substrates for these processes are various compounds in the organism 's diet or growth media. Not all organisms are able to synthesize all amino acids. For example, humans can synthesize 11 of the 20 standard amino acids.
Contents. Alpha-aminoadipic semialdehyde synthase. Alpha-aminoadipic semialdehyde synthase is an enzyme encoded by the AASS gene in humans and is involved in their major lysine degradation pathway. It is similar to the separate enzymes coded for by the LYS1 and LYS9 genes in yeast, and related to, although not similar in structure, the ...
The three products are N6-(lipoyl)lysine, L-methionine, and 5'-deoxyadenosine. Below displays the overall reaction catalyzed by lipoyl synthase, with the structures of each substrate and product. This image depicts the enzyme catalyzed reaction involving lipoyl synthase. The lysine is a residue a part of the polypeptide backbone of the protein.
In enzymology, a lysine—tRNA ligase ( EC 6.1.1.6) is an enzyme that catalyzes the chemical reaction. The 3 substrates of this enzyme are ATP, L-lysine, and tRNA (Lys), whereas its 3 products are AMP, diphosphate, and L-lysyl-tRNA (Lys) . This enzyme participates in 3 metabolic pathways: lysine biosynthesis, aminoacyl-trna biosynthesis, and ...
Desmosine is a component of elastin and cross links with its isomer, isodesmosine, giving elasticity to the tissue. Detection of desmosine in urine, plasma or sputum samples can be a marker for elastin breakdown due to high elastase activity related to certain diseases. [1][2]
The 3 substrates of this enzyme are N6-(L-1,3-dicarboxypropyl)-L-lysine, NAD +, and H 2 O, whereas its 4 products are L-lysine, 2-oxoglutarate, NADH, and H +. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH group of donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is N6 ...