Ushida C, Izawa D, Muto A
Department of Biology, Faculty of Science, Hirosaki University, Japan.
Mol Biol Rep. 1995;22(2-3):125-9. doi: 10.1007/BF00988716.
There are at least six small stable RNAs in Mycoplasma capricolum cells besides tRNAs and rRNAs. One of them, MCS5 RNA, is a homolog of RNase P RNA. The predicted secondary structure of this RNA is essentially the same as that of other eubacterial RNase P RNAs. MCS5 RNA is more similar to the RNase P RNA of B. Subtilis than to that of E. coli. This is consistent with previous conclusions that mycoplasmas are phylogenetically related to the low G + C Gram-positive bacterial group. The major substrates for MCS5 RNA must be the precursors of tRNAs. The precursor of MCS6 RNA, which is a homolog of the E. coli 10Sa RNA, may also be a substrate for the MCS5 RNA because this RNA has a tRNA-like structure at its 5' and 3' ends.
除了转运RNA（tRNA）和核糖体RNA（rRNA）外，山羊支原体细胞中至少还有六种小的稳定RNA。其中之一，MCS5 RNA，是核糖核酸酶P RNA（RNase P RNA）的同源物。这种RNA的预测二级结构与其他真细菌RNase P RNA的二级结构基本相同。MCS5 RNA与枯草芽孢杆菌的RNase P RNA比与大肠杆菌的RNase P RNA更相似。这与之前的结论一致，即支原体在系统发育上与低G + C革兰氏阳性细菌群相关。MCS5 RNA的主要底物一定是tRNA的前体。MCS6 RNA的前体是大肠杆菌10Sa RNA的同源物，它也可能是MCS5 RNA的底物，因为这种RNA在其5'和3'末端具有类似tRNA的结构。
