2-Aminoisobutyric acid, or α-aminoisobutyric acid (AIB) or α-methylalanine or 2-methylalanine, is an amino acid with the structural formula is H2N-C(CH3)2-COOH.
It is contained in some antibiotics of fungal origin, eg. alamethicin and some lantibiotics. It is not one of the proteinogenic amino acids and rather rare in nature.
α-Aminoisobutyric acid is a strong helix inducer in peptides. Its oligomers form 3-10 helices.
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