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Pathway Description
Lysine Degradation
Homo sapiens
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2013-08-01
Last Updated: 2023-10-25
The degradation of L-lysine happens in liver and it is consisted of seven reactions. L-Lysine is imported into liver through low affinity cationic amino acid transporter 2 (cationic amino acid transporter 2/SLC7A2). Afterwards, L-lysine is imported into mitochondria via mitochondrial ornithine transporter 2. L-Lysine can also be obtained from biotin metabolism. L-Lysine and oxoglutaric acid will be combined to form saccharopine by facilitation of mitochondrial alpha-aminoadipic semialdehyde synthase, and then, mitochondrial alpha-aminoadipic semialdehyde synthase will further breaks saccharopine down to allysine and glutamic acid. Allysine will be degraded to form aminoadipic acid through alpha-aminoadipic semialdehyde dehydrogenase. Oxoadipic acid is formed from catalyzation of mitochondrial kynurenine/alpha-aminoadipate aminotransferase on aminoadipic acid. Oxoadipic acid will be further catalyzed to form glutaryl-CoA, and glutaryl-CoA converts to crotonoyl-CoA, and crotonoyl-CoA transformed to 3-hydroxybutyryl-CoA. 3-Hydroxybutyryl-CoA will form Acetyl-CoA as the final product through the intermediate compound: acetoacetyl-CoA. Acetyl-CoA will undergo citric acid cycle metabolism. Carnitine is another key byproduct of lysine metabolism (not shown in this pathway).
References
Lysine Degradation References
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