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. 2020 Mar 22;12(3):848. doi: 10.3390/nu12030848

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© 2020 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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HIS catabolism. 1, histidase; 2, urocanase, 3, imidazolone propionate hydrolase; 4, glutamate formimino transferase; 5, glutamate dehydrogenase; 6, alanine aminotransferase; 7, glutamine synthetase; 8, histidine aminotransferase. Ala, alanine; Asp, aspartic acid; FIGLU, formiminoglutamate; Gln; glutamine; Glu, glutamic acid; Gln, glutamine; Gly, glycine; HC, homocysteine; Met, methionine; Pyr, pyruvate; SAHC, S-adenosylhomocysteine; SAME, S-adenosylmethionine; Ser, serine; THF, tetrahydrofolate; TCAc, tricarboxylic acid cycle; UV, ultraviolet radiation; α-AA, α-amino acid; α-KA, α-keto acid; α-KG, α-ketoglutarate.