磷酸二酯键(英语:phosphodiester bond)也称为“3′,5′-磷酸二酯键”或“磷酸双酯键”,是核酸分子中的磷酸基团原子与另外两个五碳糖分子的原子之间形成的共价键。这种形式的键结于DNARNA分子中负责将分别位于两个核糖上的3号碳与5号碳连结起来。[1]

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两个磷酸二酯键连接了三个核苷

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