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|Section2= }} Pyroglutamic acid (also known as PCA, 5-oxoproline, pidolic acid, or pyroglutamate for its basic form) is an uncommon amino acid derivative in which the free amino group of glutamic acid or glutamine cyclizes to form a lactam. It is a metabolite in the glutathione cycle that is converted to glutamate by 5-oxoprolinase. Pyroglutamate is found in many proteins including bacteriorhodopsin. ''N''-terminal glutamic acid and glutamine residues can spontaneously cyclize to become pyroglutamate. This is one of several forms of blocked ''N''-terminals which present a problem for ''N''-terminal sequencing using Edman chemistry, which requires a free primary amino group not present in pyroglutamic acid. The enzyme pyroglutamate aminopeptidase can restore a free ''N''-terminus by cleaving off the pyroglutamate residue.〔.〕 Pyroglutamic acid, also known as pidolic acid, exists as two distinct enantiomers: *(2''R'') or D which happens to be (+) or ''d'' *(2''S'') or L which happens to be (–) or ''l'' ==Uses== The sodium salt of pyroglutamic acid – known either as sodium pyroglutamate, sodium PCA, or sodium pidolate – is used on the skin to retain moisture. L-pyroglutamic acid is sold as a dietary supplement. Magnesium pidolate, the magnesium salt of pyroglutamic acid, is a mineral supplement. 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「Pyroglutamic acid」の詳細全文を読む スポンサード リンク
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