核糖体RNA的进化

Evolution of ribosomal RNA.

作者信息

Ishikawa H

机构信息

Department of Biology, College of General Education, University of Tokyo, Japan.

出版信息

Comp Biochem Physiol B. 1977;58(1):1-7. doi: 10.1016/0305-0491(77)90116-x.

DOI:10.1016/0305-0491(77)90116-x

Abstract

The G + C content of ribosomal RNA of animals seems correlated with the length of periods required for maturation of those organisms. 2. In Protostomes of the animal kingdom, the size of the 28S rRNA molecule does not seem to correlate with the evolutionary stage of the organism. 3. Aphids and water-fleas as well as some protozoa have the 18S rRNA with mol. wt of 0.9 x 10(6) against an overwhelming pressure of evolution to conserve the rRNA molecule of 0.7 x 10(6) daltons. 4. All the Deuterostomes examined were distinguished from Protostomes by having the 28S rRNA's void of the hidden break at the central point. 5. Aphids and nematodes are exceptional Protostomes in that they have the 28S rRNA's without the hidden break. This was discussed in the light of the evolutionary stage of these organisms. 6. Molecular properties of chloroplast rRNA seem to evidence for endosymbiotic origin of this organelle. Mitochondrial rRNA differs considerably from prokaryotic rRNA with respect to molecular size and base composition.

摘要

动物核糖体RNA的G + C含量似乎与这些生物成熟所需的时间长度相关。2. 在动物界的原口动物中，28S rRNA分子的大小似乎与生物的进化阶段无关。3. 蚜虫、水蚤以及一些原生动物具有分子量为0.9×10⁶的18S rRNA，尽管存在着保留0.7×10⁶道尔顿rRNA分子的强大进化压力。4. 所有被研究的后口动物与原口动物的区别在于其28S rRNA在中心点没有隐藏的断裂。5. 蚜虫和线虫是特殊的原口动物，因为它们的28S rRNA没有隐藏的断裂。这是根据这些生物的进化阶段进行讨论的。6. 叶绿体rRNA的分子特性似乎证明了该细胞器的内共生起源。线粒体rRNA在分子大小和碱基组成方面与原核生物rRNA有很大差异。