30S核糖体亚基(prokaryotic small ribosomal subunit、30S subunit)原核生物70S核糖体中的小亚基。它是核糖体RNA与核糖核蛋白组成的复合物,包括16S 核糖体RNA和21种碱性蛋白质,具有翻译mRNA的功能。

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嗜热栖热菌英语Thermus thermophilus的30S亚基微观结构,蓝色为蛋白质,橙色为单链RNA[1]

30S核糖体亚基可被胺基糖苷类四环霉素抗生素所抑制。

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