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Pathway Description
Alanine Metabolism
Homo sapiens
Metabolic Pathway
Alanine (L-Alanine) is an α-amino acid that is used for protein biosynthesis. Approximately 8% of human proteins have alanine in their structures. The reductive lamination of pyruvate is effected by alanine transaminase. L-Alanine can be converted to pyruvic acid by alanine aminotransferase 1 reversibly coupled with interconversion of oxoglutaric acid and L-glutamic acid. L-Alanine can also be produced by alanine-glyoxylate transaminase with coupled interconversion of glyoxylate and glycine. L-Alanine will be coupled with alanyl tRNA by alanyl-tRNA synthetase to perform protein biosynthesis. Alanine can also be used to provide energy under fasting conditions. There are two pathways that can facilitate this: (1) alanine is converted to pyruvate to synthesize glucose via the gluconeogenesis pathway in liver tissue or (2) alanine converted into pyruvate moves into the TCA cycle to be oxidized in other tissues.
References
Alanine Metabolism References
Lehninger, A.L. Lehninger principles of biochemistry (4th ed.) (2005). New York: W.H Freeman.
Salway, J.G. Metabolism at a glance (3rd ed.) (2004). Alden, Mass.: Blackwell Pub.
MacDonald M, Neufeldt N, Park BN, Berger M, Ruderman N: Alanine metabolism and gluconeogenesis in the rat. Am J Physiol. 1976 Aug;231(2):619-26. doi: 10.1152/ajplegacy.1976.231.2.619.
Pubmed: 961915
Ruderman NB, Schmahl FW, Goodman MN: Regulation of alanine formation and release in rat muscle in vivo: effect of starvation and diabetes. Am J Physiol. 1977 Aug;233(2):E109-14. doi: 10.1152/ajpendo.1977.233.2.E109.
Pubmed: 888947
Garber AJ, Karl IE, Kipnis DM: Alanine and glutamine synthesis and release from skeletal muscle. I. Glycolysis and amino acid release. J Biol Chem. 1976 Feb 10;251(3):826-35.
Pubmed: 1249058
Garber AJ, Karl IE, Kipnis DM: Alanine and glutamine synthesis and release from skeletal muscle. II. The precursor role of amino acids in alanine and glutamine synthesis. J Biol Chem. 1976 Feb 10;251(3):836-43.
Pubmed: 1249059
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