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| Section2 = }} Isoleucine (abbreviated as Ile or I) is a proteinogenic α-amino acid which is essential in humans (it cannot be synthesized, so it must be ingested). The ''iso-'' in its name refers to it being an isomer of leucine. Its chemical formula is HO2CCH(NH2)CH(CH3)CH2CH3. Its codons are AUU, AUC and AUA. With a hydrocarbon side chain, isoleucine is classified as hydrophobic. Together with threonine, isoleucine is one of two common amino acids that have a chiral side chain. Four stereoisomers of isoleucine are possible, including two possible diastereomers of L-isoleucine. However, isoleucine present in nature exists in one enantiomeric form: (2''S'',3''S'')-2-amino-3-methylpentanoic acid. == Metabolism == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「isoleucine」の詳細全文を読む スポンサード リンク
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