Kilpatrick M W, Walker R T
Nucleic Acids Res. 1981 Sep 11;9(17):4387-90. doi: 10.1093/nar/9.17.4387.
Using in vitro labelling techniques, a tRNAMMet from Thermoplasma acidophilum, a member of the Archaebacteriae, has been shown to have the sequence: pGCCGGG Gs4UGGCUCANCUGGAGGAGC m2(2)GCCGGACmUCAUt6AAUCCGGAGGUCUCGGG psi psi CmGAUCCCCGAUCCCGGCACCAOH. Despite the small genome size of this non-parasitic organism, eight modified nucleosides are present, one of which is typically eubacterial, one of which is typically eukaryotic and some of which appear to be unique to the archaebacteria. There is no close sequence homology between this tRNA and that of any other methionine tRNA so far sequenced (less than 70%) but it has almost 90% homology with the nucleotide sequence proposed by Eigen and Oswatitsch for the ancestral quasi-species.
运用体外标记技术,已证明嗜热栖热菌(古细菌的一种)的甲硫氨酸转运核糖核酸(tRNAMMet)具有如下序列:pGCCGGG Gs4UGGCUCANCUGGAGGAGC m2(2)GCCGGACmUCAUt6AAUCCGGAGGUCUCGGG ψψCmGAUCCCCGAUCCCGGCACCAOH。尽管这种非寄生生物的基因组规模较小,但其中存在8种修饰核苷,其中一种典型地存在于真细菌中,一种典型地存在于真核生物中,还有一些似乎是古细菌所特有的。到目前为止,该转运核糖核酸与已测序的任何其他甲硫氨酸转运核糖核酸之间不存在紧密的序列同源性(低于70%),但它与艾根和奥斯瓦蒂施提出的祖先准种的核苷酸序列具有近90%的同源性。