Beta-aminoisobutyric acid

Farkas WR, Fischbein A, Solomon S, et al. 1987. Elevated urinary excretion of beta-aminoisobutyric acid and exposure to inorganic lead. Arch Environ Health 42 96-99. 

C4H8N202 N-[(methylamtno)carbonyl]acetamtde 623-59-6 25.00 1.1408 2 3722 C4H9N02 DL-beta-aminoisobutyric acid 10569-72-9 24.86 0.9809 2... 

Once in the body, the purine and pyrimidine bases may be reused. They are not only used for DNA and RNA but also as components of a variety of coenzymes. If not used, pyrimidines are catabolized to beta-alanine, beta-aminoisobutyric acid, carbon dioxide (CO,), and ammonia (NHj), while the purines are converted to uric acid. Ammonia, uric acid, and beta-aminoisobutyric acid are excreted in the urine. 

Some nonstandard amino acids are not found in proteins. Examples include lanthionine, 2-aminoisobutyric acid, dehydroalanine and the neurotransmitter gamma-aminobutyric acid. Nonstandard amino acids often occur as intermediates in the metabolic pathways for standard amino acids — for example ornithine and citrulline occur in the urea cycle, part of amino acid catabolism (see below). A rare exception to the dominance of a-amino acids in biology is the P-amino acid beta alanine (3-aminopropanoic acid), which is used in plants and microorganisms in the synthesis of pantothenic acid (vitamin B5), a component of coenzyme A. 

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