Bowman C M, Dyer T A
Biochem J. 1979 Dec 1;183(3):605-13. doi: 10.1042/bj1830605.
A species of low-molecular-weight ribosomal RNA, referred to as '4.5S rRNA', was found in addition to 5S rRNA in the large subunit of chloroplast ribosomes of a wide range of flowering plants. It was shown by sequence analysis that several variants of this RNA may occur in a plant. Furthermore, although in most flowering plants the predominant variant contains about 100 nucleotides, in the broad bean it has less than 80. It seems, therefore, to be much more diverse in size and sequence than the other ribosomal RNA species. Like 5S rRNA , it does not contain modified nucleotides and it is also unusual in having an unphosphorylated 5'-end. It is apparently neither a homologue of cytosol 5.8S rRNA nor a fragment of 23S rRNA.
在多种开花植物叶绿体核糖体的大亚基中，除了5S rRNA之外，还发现了一种低分子量核糖体RNA，称为“4.5S rRNA”。序列分析表明，这种RNA在植物中可能存在几种变体。此外，尽管在大多数开花植物中，主要变体含有约100个核苷酸，但在蚕豆中它的核苷酸数少于80个。因此，它在大小和序列上似乎比其他核糖体RNA种类更加多样。与5S rRNA一样，它不含有修饰核苷酸，其5'-末端未磷酸化也很不寻常。它显然既不是胞质溶胶5.8S rRNA的同源物，也不是23S rRNA的片段。
