本文的谷氨酰基转移酶（GGT，EC2.3.2.2）是从猪肾皮质中提取的。

In this study, Gamma-glutamyltransferase(GGT, EC2.3.2.2) was purified from pig kidney.

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当产物积累超出最佳数量时，它将与酶的一个氨酰基位点(变构位点)结合改变其形状，使其不能长时间与底物发生作用。

When the product accumulates beyond an optimal amount it binds to a site (ALLOSTERIC site) on the enzyme, changing the shape so that it can no longer react with its substrate.

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当产物积累超出最佳数量时，它将与酶的一个氨酰基位点(变构位点)结合改变其形状，使其不能长时间与底物发生作用。

When the product accumulates beyond an optimal amount it binds to a site (ALLOSTERIC site) on the enzyme, changing the shape so that it can no longer react with its substrate.

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