以下为句子列表：
英文: The metal ion may be the catalytic center of the cofactor, or it may serve to bind the enzyme and substrate together to hold the enzyme in a catalytically active conformation.
中文: 金属离子可以是辅助因素的催化中心，也可以帮助形成酶活性所必须的构象。
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英文: When a catalytically active enzyme forms a complex with a cofactor a holoenzyme is produced.
中文: 酶蛋白和辅助因子两者结合成完整分子时，形成具有活力的全酶。
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