30S核醣體亞基(prokaryotic small ribosomal subunit、30S subunit)原核生物70S核醣體中的小亞基。它是核醣體RNA與核糖核蛋白組成的複合物,包括16S 核醣體RNA和21種鹼性蛋白質,具有翻譯mRNA的功能。

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嗜熱棲熱菌英語Thermus thermophilus的30S亞基微觀結構,藍色為蛋白質,橙色為單鏈RNA[1]

30S核醣體亞基可被胺基糖苷類四環黴素抗生素所抑制。

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