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<full_title>WikiJournal of Science/Lysine: biosynthesis, catabolism and roles</full_title>
<abbrev_title>Wiki.J.Sci.</abbrev_title>
<issn media_type='electronic'>2002-4436 / 2470-6345 / 2639-5347</issn>
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<doi>10.15347/WJS</doi>
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<year>2019</year>
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<titles>
<title>Lysine: biosynthesis, catabolism and roles</title>
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<surname></surname>
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<publication_date media_type='online'>
<year>2019</year>
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<doi_data>
<doi>10.15347/wjs/2018.004</doi>
<resource>https://en.wikiversity.org/wiki/WikiJournal of Science/Lysine: biosynthesis, catabolism and roles</resource>
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This is an open access article distributed under the [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution License], which permits unrestricted use, distribution, and reproduction, provided the original author and source are credited.</license-p>
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Amino acids are an essential building block of all life and are commonly incorporated into extending polypeptide chains to produce proteins. Lysine is one such amino acid and is classified as basic and positively charged at physiological pH due to the presence of an additional amino chemical group on the side chain. Lysine has two main biosynthetic pathways, namely the diaminopimelate and α-aminoadipate pathways, which employ different enzymes and substrates and are found in different organisms. Lysine catabolism occurs through one of several pathways, the most common of which is the saccharopine pathway. Lysine plays several roles in humans, most importantly proteinogenesis, but also in the crosslinking of collagen polypeptides, uptake of essential mineral nutrients, and in the production of carnitine, which is key in fatty acid metabolism. Furthermore, lysine is often involved in histone modifications, and thus, impacts the epigenome. Due to the importance of lysine in several biological processes, a lack of lysine can lead to several disease states including; defective connective tissues, impaired fatty acid metabolism, anaemia, and systemic protein-energy deficiency. In juxtaposition to this, an overabundance of lysine, caused by ineffective catabolism, can cause severe neurological issues.
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