Luehrsen K R, Fox G E, Kilpatrick M W, Walker R T, Domdey H, Krupp G, Gross H J
Nucleic Acids Res. 1981 Feb 25;9(4):965-70. doi: 10.1093/nar/9.4.965.
The complete nucleotide sequence of the 5S ribosomal RNA isolated from the archaebacterium Thermoplasma acidophilum has been determined. The sequence is: pG GCAACGGUCAUAGCAGCAGGGAAACACCAGAUCCCAUUCCGAACUCGACGGUUAAGCCUGCUGCGUAUUGCGUUGUACU GUAUGCCGCGAGGGUACGGGAAGCGCAAUAUGCUGUUACCAC(U)OH. The homology with the 55 rRNA from another archaebacterial species, Halobacterium cutirubrum, is only 60.6% and other 55 rRNAs are even less homologous. Examination of the potential for forming secondary structure is revealing. T. acidophilum does not conform to the usual models employed for either procaryotic or eucaryotic 5S rRNAs. Instead this 5S rRNA has a mixture of the characteristic features of each. On the whole this 5S rRNA does however appear more eucaryotic than eubacterial. These results give further support to the notion that the archaebacteria represent an extremely early divergence among entities with procaryotic organization.
已确定从嗜酸性嗜热栖热菌分离出的5S核糖体RNA的完整核苷酸序列。序列为:pG GCAACGGUCAUAGCAGCAGGGAAACACCAGAUCCCAUUCCGAACUCGACGGUUAAGCCUGCUGCGUAUUGCGUUGUACU GUAUGCCGCGAGGGUACGGGAAGCGCAAUAUGCUGUUACCAC(U)OH。与另一种古细菌物种——红皮盐杆菌的5S rRNA的同源性仅为60.6%,与其他5S rRNAs的同源性更低。对形成二级结构可能性的研究很有启发性。嗜酸性嗜热栖热菌不符合用于原核生物或真核生物5S rRNAs的通常模型。相反,这种5S rRNA具有两者特征的混合。总体而言,这种5S rRNA看起来更像真核生物而非真细菌。这些结果进一步支持了古细菌代表具有原核组织的实体中极其早期分化的观点。