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γ-谷氨酰转肽酶(Gamma-glutamyltransferase)又称γ-谷氨酰转移酶、GGT、γ-GT、EC 2.3.2.2[1],是一种轉移酶,在γ-谷氨酸官能团从谷胱甘肽等分子上转移至受体時起催化作用,受体可能是一种氨基酸、一种肽或水[2]。γ-谷氨酰转肽酶在γ-谷氨酰循环(Gamma-glutamyl cycle)中起着关键作用。许多人體组织中都有γ-谷氨酰转肽酶,例如肝脏。
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