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三磷酸尿苷

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三磷酸尿苷
识别
CAS号 63-39-8  checkY
PubChem 1181
MeSH Uridine+triphosphate
性质
化学式 C9H15N2O15P3
摩尔质量 484.141 g·mol⁻¹
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

三磷酸尿苷(英语:uridine triphosphate, UTP)是一种嘧啶核苷酸,由碱基尿嘧啶核糖组成,另外还接有一个三磷酸于5'位置。UTP主要是作为RNA合成(转录)时的原料。

在代谢中的作用

UTP可用作能量来源,功能类似ATP,但较ATP少见。

  • 半乳糖的降解代谢中,UTP与葡萄糖-1-磷酸形成UDP-葡萄糖,进而使得半乳糖-1-磷酸转变成为UDP-半乳糖,经过差向异构化又形成UDP-葡萄糖。
  • 乳糖的合成代谢中,半乳糖-1-磷酸可与UTP形成UDP-半乳糖,进而与葡萄糖连接为乳糖。
  • 糖原的合成代谢中,UTP与葡萄糖-1-磷酸形成UDP-葡萄糖,后者在糖原合酶的作用下延伸糖原















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三磷酸尿苷
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